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ONT to SEA

Ontario to Seattle Flights

Compare fares, departure times, stops and baggage details for this route, then open the full search when you are ready to check current availability and complete booking.

Fare checked before payment All fees shown upfront Transparent cancellation policy 24×7 booking support
Lowest fare₹23,294Delta Air Lines
Fastest2h 47mgate to gate
Options found49flights on this route
Find your flight ONT SEA

Available Flights & Fares

Compare fares, timings and baggage. Pick the flight that suits your trip.

Prices in INR
49 flight options

Fares are checked again before payment.

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Delta Air Lines
Delta Air Lines
DL-3816
07:00
2026-11-14
Ontario (ONT)United States flagOntario International
3H :01 M
Non Stop
10:01
2026-11-14
SEATTLE (SEA)United States flagSeattle/tacoma International
Non Refundable 9 Seat Left Economy
Check-in: 0 PiecesCabin: 1 Pieces
Delta Air Lines
Delta Air Lines
DL-4031
17:56
2026-11-14
Ontario (ONT)United States flagOntario International
3H :01 M
Non Stop
20:57
2026-11-14
SEATTLE (SEA)United States flagSeattle/tacoma International
Non Refundable 9 Seat Left Economy
Check-in: 0 PiecesCabin: 1 Pieces
United Airlines
United Airlines
UA-2446
05:00
2026-11-14
Ontario (ONT)United States flagOntario International
8H :55 M
1 Stop
DEN · 3h 33m Denver (DEN), United States
13:55
2026-11-14
SEATTLE (SEA)United States flagSeattle/tacoma International
Non Refundable 9 Seat Left Economy
Check-in: 0 PiecesCabin: 1 Pieces
United Airlines
United Airlines
UA-2363
06:00
2026-11-14
Ontario (ONT)United States flagOntario International
6H :20 M
1 Stop
SFO · 2h 36m San Francisco (SFO), United States
12:20
2026-11-14
SEATTLE (SEA)United States flagSeattle/tacoma International
Non Refundable 9 Seat Left Economy
Check-in: 0 PiecesCabin: 1 Pieces
AA
American Airlines
AA-1591
06:30
2026-11-14
Ontario (ONT)United States flagOntario International
7H :21 M
1 Stop
PHX · 2h 32m Phoenix (PHX), United States
13:51
2026-11-14
SEATTLE (SEA)United States flagSeattle/tacoma International
Non Refundable 7 Seat Left Economy
Check-in: 0 PiecesCabin: 2 Pieces
United Airlines
United Airlines
UA-432
09:25
2026-11-14
Ontario (ONT)United States flagOntario International
5H :14 M
1 Stop
SFO · 1h 27m San Francisco (SFO), United States
14:39
2026-11-14
SEATTLE (SEA)United States flagSeattle/tacoma International
Non Refundable 9 Seat Left Economy
Check-in: 0 PiecesCabin: 1 Pieces
United Airlines
United Airlines
UA-432
09:25
2026-11-14
Ontario (ONT)United States flagOntario International
7H :01 M
1 Stop
SFO · 3h 15m San Francisco (SFO), United States
16:26
2026-11-14
SEATTLE (SEA)United States flagSeattle/tacoma International
Non Refundable 9 Seat Left Economy
Check-in: 0 PiecesCabin: 1 Pieces
AA
American Airlines
AA-1423
09:29
2026-11-14
Ontario (ONT)United States flagOntario International
8H :24 M
1 Stop
PHX · 3h 36m Phoenix (PHX), United States
17:53
2026-11-14
SEATTLE (SEA)United States flagSeattle/tacoma International
Non Refundable 7 Seat Left Economy
Check-in: 0 PiecesCabin: 2 Pieces
AA
American Airlines
AA-3016
13:23
2026-11-14
Ontario (ONT)United States flagOntario International
6H :46 M
1 Stop
PHX · 2h 02m Phoenix (PHX), United States
20:09
2026-11-14
SEATTLE (SEA)United States flagSeattle/tacoma International
Non Refundable 7 Seat Left Economy
Check-in: 0 PiecesCabin: 2 Pieces
United Airlines
United Airlines
UA-1263
13:29
2026-11-14
Ontario (ONT)United States flagOntario International
7H :50 M
1 Stop
DEN · 2h 25m Denver (DEN), United States
21:19
2026-11-14
SEATTLE (SEA)United States flagSeattle/tacoma International
Non Refundable 9 Seat Left Economy
Check-in: 0 PiecesCabin: 1 Pieces
United Airlines
United Airlines
UA-1375
13:35
2026-11-14
Ontario (ONT)United States flagOntario International
5H :11 M
1 Stop
SFO · 1h 12m San Francisco (SFO), United States
18:46
2026-11-14
SEATTLE (SEA)United States flagSeattle/tacoma International
Non Refundable 9 Seat Left Economy
Check-in: 0 PiecesCabin: 1 Pieces
United Airlines
United Airlines
UA-1375
13:35
2026-11-14
Ontario (ONT)United States flagOntario International
7H :12 M
1 Stop
SFO · 3h 25m San Francisco (SFO), United States
20:47
2026-11-14
SEATTLE (SEA)United States flagSeattle/tacoma International
Non Refundable 9 Seat Left Economy
Check-in: 0 PiecesCabin: 1 Pieces
United Airlines
United Airlines
UA-5577
16:17
2026-11-14
Ontario (ONT)United States flagOntario International
4H :30 M
1 Stop
SFO · 0h 40m San Francisco (SFO), United States
20:47
2026-11-14
SEATTLE (SEA)United States flagSeattle/tacoma International
Non Refundable 9 Seat Left Economy
Check-in: 0 PiecesCabin: 1 Pieces
United Airlines
United Airlines
UA-5577
16:17
2026-11-14
Ontario (ONT)United States flagOntario International
7H :14 M
1 Stop
SFO · 3h 15m San Francisco (SFO), United States
23:31
2026-11-14
SEATTLE (SEA)United States flagSeattle/tacoma International
Non Refundable 5 Seat Left Economy
Check-in: 0 PiecesCabin: 1 Pieces
AA
American Airlines
AA-1423
09:29
2026-11-14
Ontario (ONT)United States flagOntario International
10H :40 M
1 Stop
PHX · 5h 56m Phoenix (PHX), United States
20:09
2026-11-14
SEATTLE (SEA)United States flagSeattle/tacoma International
Non Refundable 7 Seat Left Economy
Check-in: 0 PiecesCabin: 2 Pieces
Alaska Airlines
Alaska Airlines
AS-607
06:00
2026-11-14
Ontario (ONT)United States flagOntario International
2H :51 M
Non Stop
08:51
2026-11-14
SEATTLE (SEA)United States flagSeattle/tacoma International
Non Refundable 7 Seat Left Economy
Check-in: 0 PiecesCabin: 2 Pieces
Alaska Airlines
Alaska Airlines
AS-575
12:02
2026-11-14
Ontario (ONT)United States flagOntario International
2H :47 M
Non Stop
14:49
2026-11-14
SEATTLE (SEA)United States flagSeattle/tacoma International
Non Refundable 7 Seat Left Economy
Check-in: 0 PiecesCabin: 2 Pieces
Alaska Airlines
Alaska Airlines
AS-571
16:09
2026-11-14
Ontario (ONT)United States flagOntario International
2H :47 M
Non Stop
18:56
2026-11-14
SEATTLE (SEA)United States flagSeattle/tacoma International
Non Refundable 7 Seat Left Economy
Check-in: 0 PiecesCabin: 2 Pieces
AA
American Airlines
AA-1591
06:30
2026-11-14
Ontario (ONT)United States flagOntario International
13H :39 M
1 Stop
PHX · 8h 52m Phoenix (PHX), United States
20:09
2026-11-14
SEATTLE (SEA)United States flagSeattle/tacoma International
Non Refundable 7 Seat Left Economy
Check-in: 0 PiecesCabin: 2 Pieces
Alaska Airlines
Alaska Airlines
AS-3312
10:40
2026-11-14
Ontario (ONT)United States flagOntario International
4H :28 M
1 Stop
PDX · 1h 05m Portland (PDX), United States
15:08
2026-11-14
SEATTLE (SEA)United States flagSeattle/tacoma International
Non Refundable 4 Seat Left Economy
Check-in: 0 PiecesCabin: 2 Pieces
Alaska Airlines
Alaska Airlines
AS-3312
10:40
2026-11-14
Ontario (ONT)United States flagOntario International
6H :17 M
1 Stop
PDX · 2h 50m Portland (PDX), United States
16:57
2026-11-14
SEATTLE (SEA)United States flagSeattle/tacoma International
Non Refundable 4 Seat Left Economy
Check-in: 0 PiecesCabin: 2 Pieces
Alaska Airlines
Alaska Airlines
AS-2384
16:04
2026-11-14
Ontario (ONT)United States flagOntario International
5H :33 M
1 Stop
BOI · 1h 55m Boise (BOI), United States
21:37
2026-11-14
SEATTLE (SEA)United States flagSeattle/tacoma International
Non Refundable 7 Seat Left Economy
Check-in: 0 PiecesCabin: 2 Pieces

Need a hotel in Seattle?

Find a stay in Seattle. Choose your dates, rooms and guests in hotel search.

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United Airlines
United Airlines
UA-2363
06:00
2026-11-14
Ontario (ONT)United States flagOntario International
8H :39 M
1 Stop
SFO · 4h 52m San Francisco (SFO), United States
14:39
2026-11-14
SEATTLE (SEA)United States flagSeattle/tacoma International
Non Refundable 9 Seat Left Economy
Check-in: 0 PiecesCabin: 1 Pieces
United Airlines
United Airlines
UA-2363
06:00
2026-11-14
Ontario (ONT)United States flagOntario International
10H :26 M
1 Stop
SFO · 6h 40m San Francisco (SFO), United States
16:26
2026-11-14
SEATTLE (SEA)United States flagSeattle/tacoma International
Non Refundable 9 Seat Left Economy
Check-in: 0 PiecesCabin: 1 Pieces
United Airlines
United Airlines
UA-2363
06:00
2026-11-14
Ontario (ONT)United States flagOntario International
12H :46 M
1 Stop
SFO · 8h 47m San Francisco (SFO), United States
18:46
2026-11-14
SEATTLE (SEA)United States flagSeattle/tacoma International
Non Refundable 9 Seat Left Economy
Check-in: 0 PiecesCabin: 1 Pieces
United Airlines
United Airlines
UA-2363
06:00
2026-11-14
Ontario (ONT)United States flagOntario International
14H :47 M
1 Stop
SFO · 11h 00m San Francisco (SFO), United States
20:47
2026-11-14
SEATTLE (SEA)United States flagSeattle/tacoma International
Non Refundable 9 Seat Left Economy
Check-in: 0 PiecesCabin: 1 Pieces
No flights match the selected filters. Clear filters or open full search.

Airfare Highlights

From flights departing on Sat, 14 Nov 2026.

Lowest fare ₹23,294 Delta Air Lines 07:00
Earliest departure ₹25,911 United Airlines 05:00
Shortest duration ₹29,768 Alaska Airlines 12:02
Night 00:00-05:59 ₹25,911 United Airlines at 05:00
Morning 06:00-11:59 ₹23,294 Delta Air Lines at 07:00
Afternoon 12:00-17:59 ₹23,294 Delta Air Lines at 17:56
Evening 18:00-23:59 No option Open full search for more

Departure & Arrival Airport Details

Ontario (ONT)

Ontario International

United States

GMT -8

Latitude: 34.055999755859375

Longitude: -117.60099792480469

Seattle (SEA)

Seattle/tacoma International

United States

GMT -8

Latitude: 47.449001

Longitude: -122.308998

Distance: Ontario (ONT), United States to Seattle (SEA), United States - 1,540.37 km
Flights shown for 14 Nov 2026. View all flights opens the complete search result.
Route forecast

Weather in Ontario and Seattle

Live forecast for both cities, 03 Nov to 06 Nov.

Departure city

Ontario

Fri, 06 Nov
28°CCloudyLow 21°
28% humidity 5 km/h wind
  • Tue24° / 12°
  • Wed26° / 16°
  • Thu27° / 20°
Arrival city

Seattle

Fri, 06 Nov
13°CPartly cloudyLow 12°
64% humidity 14 km/h wind 0.2 mm rain
  • Tue11° / 6°
  • Wed13° / 7°
  • Thu13° / 7°

Forecast data from MET Norway, CC BY 4.0.

Smart travel dates

Holidays and peak dates for Seattle

Fares and hotel rates usually run higher around these dates. Booking earlier or moving your trip by a day or two often costs less.

Busiest periods: Summer travel (15 Jun – 31 Aug), Holiday season (18 Dec – 02 Jan).

  • 11NovVeterans DayWednesday
  • 26NovThanksgiving DayThursday
  • 25DecChristmas DayFriday
  • 01JanNew Year's DayFriday
  • 18JanMartin Luther King, Jr. DayMonday
  • 12FebLincoln's BirthdayFriday

Fixed-date national holidays. Festivals that follow the lunar calendar shift each year and are not listed here, so check the exact date for your travel year.

Compare your journey

How to travel Ontario to Seattle

Ways to make this trip that you can book on FlyX, compared by price and journey time.

OptionFromJourney timeAvailabilityAction
Non-stop flight Fastest₹23,2942h 47m5 flights
Connecting flight₹25,911Longer, includes a stop44 options

Air distance is about 1,540 km. 4 airlines operate this route.

Road distance and coach duration are approximate estimates from the air distance, not a timetable.

Airlines flying from Ontario to Seattle

Compare fares, stops, baggage and refundability across the airlines flying this route.

United Airlines Flights

from ₹25,91135 flights
Fares from
₹25,911
Non-stop
None in these results
Departures
35 in the list above

Alaska Airlines Flights

from ₹29,7687 flights
Fares from
₹29,768
Non-stop
3 in these results
Departures
7 in the list above

American Airlines Flights

from ₹25,9115 flights
Fares from
₹25,911
Non-stop
None in these results
Departures
5 in the list above

Route Overview & Flight Facts

Fastest flight duration2h 47m · Alaska Airlines
First departure of the day05:00 · United Airlines
Last departure of the day17:56 · Delta Air Lines
Flight options found49
Direct / non-stop options5
Airport codesOntario–ONT, Seattle–SEA

Fares and timings are indicative. The exact price is confirmed with the airline when you search.

Flight Schedule, Timings & Airfare Insights

Daily Flight Schedule & Travel Duration

The search for Sat, 14 Nov found 49 flight options, 5 of them non-stop. The first flight leaves around 05:00 and the last around 17:56. The fastest flight takes about 2h 47m.

Morning vs Evening Departure Fares

Lowest fare by departure window: Morning from ₹23,294, Afternoon from ₹23,294, Night from ₹25,911. These observations do not predict the cheapest departure window on other dates.

Cheapest Airfare & Best Time to Book

Search your travel dates to compare current fares. Prices change with airline seat availability.

One-Way vs Round-Trip Fare Comparison

Compare the complete cost and conditions of both options for your dates. A round-trip can have different fare and change rules from two one-way tickets. One booking may contain multiple airline PNRs; confirm baggage transfer and connection protection for separate tickets.

Online Web Check-In & Boarding Pass

Check the operating airline’s opening time and check-in deadline for each sector. Seat charges and availability depend on your fare. Use the airline reference and the links on Web Check-in.

How to Book Cheap Flights on FlyX

  1. 1
    Enter your travel details

    Choose one-way or round-trip, pick your dates and travellers in the search form above.

  2. 2
    Compare search results

    Sort or filter the Ontario–Seattle results by price, departure time, stops and airline.

  3. 3
    Open the fare choices

    Check baggage allowance and refundability for each fare type before continuing.

  4. 4
    Review the final price

    Review the refreshed supplier fare, coupon saving and selected payment-method fee before you pay.

  5. 5
    Pay securely

    UPI, cards, net banking and wallets supported; payment and ticket issuance have separate statuses. If issuance is pending, follow the booking status; the confirmed ticket is sent after issuance.

Why Book Your Flight with FlyX?

Compare the available Ontario to Seattle options by total price, stops, baggage and fare conditions. Search your dates for current availability, then review traveller details and the final price before paying.

Payment confirmation and ticket issuance are separate steps. If your booking is awaiting a PNR or ticket, follow its status and contact FlyX support when you need help. Your issued ticket contains the airline reference and itinerary. Change and cancellation charges depend on the purchased fare and any separately disclosed service fee.

Fare checked before paymentCoupon eligibility checkedBooking status trackingBooking support

Exclusive Flight Offers & Promo Coupons

Coupon codeOfferMax saving
FLYX20Up to 20% Off on Flights₹1,500

Check coupon eligibility and the final discount on the review page before you pay. View full terms.

Frequently Asked Questions

Is it worth booking Ontario to Seattle flights in advance?

There is no guaranteed cheapest booking window. Compare your planned dates early, check nearby dates and consider baggage, connection time and change conditions as well as price. On the Ontario to Seattle dates shown on this page, the lowest fare is on a Saturday at ₹23,294. This can change from week to week.

How far is Ontario from Seattle by air?

The direct air distance between Ontario (ONT) and Seattle (SEA) is about 1,540 km. Actual flight time varies with the routing the airline files and with winds on the day.

Is there a direct flight from Ontario to Seattle?

Yes. 5 non-stop flights are listed on this page for Ontario to Seattle, operated by Alaska Airlines and Delta Air Lines. Use the Stops filter to see only those.

Which airlines fly Ontario to Seattle?

United Airlines, Alaska Airlines and American Airlines are listed on this route for the dates shown here. Fares, baggage allowance and refund rules differ by airline and by fare type, so compare the fare conditions and not only the headline price.

How long is the flight from Ontario to Seattle?

The quickest non-stop Ontario to Seattle flight on this page takes about 2h 47m. Non-stop flights here take between 2h 47m and 3h 1m. Journeys with a stop take longer, since the total includes the layover.

What is the cheapest Ontario to Seattle flight fare?

The lowest Ontario to Seattle fare on this page is ₹23,294. Fares on the same dates run up to ₹59,062, depending on airline, timing and fare type. Airline prices change often, so search your dates for the current fare.

Which is the cheapest airline for Ontario to Seattle flight?

On this page, Delta Air Lines has the lowest Ontario to Seattle fare, starting from ₹23,294. United Airlines is next, from ₹25,911. The cheapest airline can change with the date, so compare a few days around your trip.

What time do Ontario to Seattle flights depart?

On the dates shown here, the first departure is around 05:00 and the last around 17:56, local time at Ontario. Use the departure-time filter on the results above to narrow to a morning, afternoon or evening slot.

Why does the price change after clicking Book Now?

Airline seat inventory and fares change continuously. Selecting Book Now runs a live fare verification with the airline so the price you approve is the price you pay. If it has moved, you see the new figure before any payment.

Before you book this route

Check the airport codes ONT–SEA, local departure and arrival dates, and every connecting airport. Connections can have different document and baggage requirements from your final destination.

Where these fares come from

The fares, durations, stops and baggage shown here come from real airline search results for this route. They are examples for the dates on this page, not a full timetable and not a locked price. Run a search to see what is available for your own dates.

Fares shown are for departures on .

Check official travel requirements

Confirm passport, visa and transit rules for your nationality and full itinerary with the relevant government and operating airline. IATA travel-document information explains why requirements vary.

For payment, ticket issuance or a change request, see FlyX support. About FlyX.

United States travel guide for Indian travellers

Planning more than the flight? Our United States guide covers the best time to go, how long to plan for, and which places are worth the days you have. Long-haul city breaks and national parks.

Read the United States travel guide

What to Expect When Booking Your Flight

The ONT to SEA cards above show selected flight options. Airline prices and seat availability can move quickly, so the final fare is rechecked in the booking flow.

Approx route distance: 1,540.37 km.

Before you book

Compare nearby dates

The date strip opens the complete search result for the route and selected date.

Use filters

Shortlist by price, stops, departure time and refundable fare preference.

Check fare choices

Continue to Booking opens the verified fare choices, including baggage and refundability, before review.

Lowest Ontario to Seattle airfare, in 30 days and in 90 days

Cheapest FareFareDateAirlineDeparture
Lowest Airfare ₹23,294 14/11/2026 Delta Air Lines 07:00
Cheapest Airfare Within 30 Days ₹22,828 27/11/2026 Delta Air Lines 07:00
Cheapest Airfare Within 90 Days ₹22,129 26/01/2027 Delta Air Lines 07:00

Book Ontario to Seattle Flight Tickets on FlyX

FlyX lists each Ontario to Seattle flight in these results with its fare, departure time, stops, layover airport and baggage, so you can compare air tickets side by side. To find a cheap ticket, sort by price and check what baggage the fare includes. The fare is checked with the airline again before you pay.

Ontario to Seattle Flight Distance, Duration and Time

The aerial distance between Ontario and Seattle is about 1,540 KM. In these results, journey times range from 2h 47m to 27h 40m. Flights with a layover take longer because the total includes the connection time.

Ontario to Seattle flight duration is approximately 2 hours 47 minutes non-stop. There are 5 non-stop Ontario to Seattle direct flights on the departure date shown on this page. Ontario to Seattle flight distance is around 1,540 KM.

Ontario to Seattle Flight Schedule and Timing

The search for these dates returned 49 flight options, 5 of them non-stop. The first departure from Ontario is at 05:00 and the last is at 17:56. Flights leave from Ontario International and land at Seattle/tacoma International.

Flight Route Details & Analysis

Flight DetailsInformation
RouteOntario to Seattle
Aerial Distance1,540 KM
Flight Duration2h 47m - 27h 40m
Airport CodesOntario - ONT, Seattle - SEA
Total Flights Available49 flights5 direct44 with layovers
First Flight DepartureDeparts at 05:00
Last Flight DepartureDeparts at 17:56
Early Morning Flights (12 AM - 8 AM)16 flights2 direct14 with layovers
Morning Flights (8 AM - 12 PM)13 flights0 direct13 with layovers
Afternoon Flights (12 PM - 4 PM)10 flights1 direct9 with layovers
Evening Flights (4 PM - 8 PM)10 flights2 direct8 with layovers
Night Flights (8 PM - 12 AM)No flights in this time slot

Airport Information & Terminals

ONT: Ontario airport. Ontario airport transfer should be matched to the exact hotel, suburb or meeting area. Rail can work well for light luggage, but late arrivals, winter weather and family baggage often make a direct cab or booked transfer easier.

SEA: Seattle-Tacoma International Airport. Sea-Tac connects to downtown by light rail, while cabs are useful for Bellevue, Redmond or late-night arrivals. Rain and freeway traffic should be part of the plan.
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