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.
DENONTTue, 29 Sep
Fare checked before payment No hidden charges Transparent cancellation policy 24×7 booking support
Lowest fareUS$193Delta Air Lines
Fastest2h 20mgate to gate
Options found20flights on this route
Find your flightDEN → ONT
Denver to Ontario flights
Compare fares, timings and baggage. Pick the flight that suits your trip.
Prices in USD
20 flight options
Fares are checked again before payment.
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Denver to Ontario fare highlights
Selected flight highlights for 29 Sep 2026.
Lowest fare$193Delta Air Lines05:30
Earliest departure$233United Airlines05:00
Shortest duration$223United Airlines11:26
Night
00:00-05:59
$193Delta Air Lines at 05:30Morning
06:00-11:59
$193Delta Air Lines at 08:05Afternoon
12:00-17:59
$233American Airlines at 12:17Evening
18:00-23:59
$193Delta Air Lines at 18:06
Denver to Ontario route details
Denver (DEN)
Denver International
United States
GMT -7
Latitude: 39.861698150635
Longitude: -104.672996521
Ontario (ONT)
Ontario International
United States
GMT -8
Latitude: 34.055999755859375
Longitude: -117.60099792480469
Distance: Denver (DEN), United States to Ontario (ONT), United States - 1,315.73 km
Flights shown for 29 Sep 2026. View all flights opens the complete search result.
Fares and hotel rates usually run higher around these dates. Booking earlier — or shifting a day or two — often costs less.
Busiest periods: Summer travel (15 Jun – 31 Aug), Holiday season (18 Dec – 02 Jan).
12OctColumbus DayMonday · in 34 days
12OctColumbus DayMonday · in 34 days
12OctIndigenous Peoples' DayMonday · in 34 days
11NovVeterans DayWednesday · in 64 days
26NovThanksgiving DayThursday · in 79 days
25DecChristmas DayFriday · in 108 days
Fixed-date national holidays. Festivals that follow the lunar calendar shift each year and are not listed here — check the exact date for your travel year.
Compare your journey
How to travel Denver to Ontario
Every option we can actually book for you, compared on price and journey time.
Connecting flight₹18,248Longer — includes a stop18 options
Air distance is about 1,316 km. 4 airlines operate this route.
Road distance and coach duration are approximate estimates from the air distance, not a timetable.
Airlines flying from Denver to Ontario
Compare fares, stops, baggage and refundability across the airlines flying this route.
UN
United Airlines Denver to Ontario flights
from $2239 flights
Fares from
$223
Non-stop
2 in these results
Departures
9 — compare timings in the list above
AM
American Airlines Denver to Ontario flights
from $2335 flights
Fares from
$233
Non-stop
None in these results
Departures
5 — compare timings in the list above
DE
Delta Air Lines Denver to Ontario flights
from $1934 flights
Fares from
$193
Non-stop
None in these results
Departures
4 — compare timings in the list above
Denver to Ontario flight details
Lowest fare
US$193 · Tue, 29 Sep
Fastest flight duration
2h 20m · United Airlines
First departure of the day
05:00 · United Airlines
Last departure of the day
19:35 · United Airlines
Options in this snapshot
20
Direct / non-stop options
2
Popular airlines on this route
United Airlines, American Airlines, Delta Air Lines, Alaska Airlines
Airport codes
Denver–DEN, Ontario–ONT
Fares and timings are indicative — the exact price is confirmed with the airline when you search.
Denver to Ontario flight schedule, timing and fares
Denver to Ontario flight schedule and timing
Around 20 flights appear in the dated route snapshot, including 2 non-stop options. Departures run through the day — the first flight leaves around 05:00 and the last around 19:35. The fastest flight takes about 2h 20m.
Morning vs evening Denver–Ontario fares
Lowest fare by departure window: Night from $193, Morning from $193, Evening from $193, Afternoon from $233. These observations do not predict the cheapest departure window on other dates.
What is the cheapest flight from Denver to Ontario?
The cheapest fare we are showing right now is US$193, on a Tuesday departure. Airfares change through the day, so search your dates for the exact price.
Should I book one-way or round-trip for Denver to Ontario?
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.
Which airlines should I consider for Denver to Ontario?
United Airlines (9 flights, from $223), American Airlines (5 flights, from $233), Delta Air Lines (4 flights, from $193), Alaska Airlines (2 flights, from $286). Compare fare type, baggage and refundability — the cheapest airline is not always the best value for your dates.
Web check-in for your Denver to Ontario flight
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 a Denver to Ontario flight on FlyX
1
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2
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3
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Check baggage allowance and refundability for each fare type before continuing.
4
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5
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Why book your Denver to Ontario flight with FlyX?
Compare the available Denver to Ontario 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.
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Denver to Ontario flight offers & coupon codes
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Frequently asked questions - Denver to Ontario flights
Is it worth booking Denver to Ontario 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. Across the dates currently loaded for Denver to Ontario, Tuesday shows the lowest fare at $193. That is an observed snapshot for these dates, not a rule that holds every week.
How far is Denver from Ontario by air?
The direct air distance between Denver (DEN) and Ontario (ONT) is about 1,316 km. Actual flight time varies with the routing the airline files and with winds on the day.
Are there non-stop flights from DEN to ONT?
Yes. 2 non-stop flights are showing on Denver to Ontario for the dates currently loaded. Use the Stops filter to see only those.
Which airlines fly Denver to Ontario?
United Airlines, American Airlines and Delta Air Lines are showing on this route for the dates currently loaded. 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 Denver to Ontario?
The quickest non-stop Denver to Ontario flight currently loaded takes about 2h 20m. Across the non-stop options showing, block time ranges from 2h 20m to 2h 23m. Journeys with a stop take longer, since the total includes the layover.
What is the cheapest Denver to Ontario flight fare?
The lowest fare showing on Denver to Ontario for the dates currently loaded is $193. Fares on the same dates run up to $760, depending on airline, timing and fare type. Airline pricing moves continuously, so treat this as a dated observation rather than a fixed price.
What time do Denver to Ontario flights depart?
For the dates currently loaded the first departure is around 05:00 and the last is around 19:35, local time at Denver. 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 DEN–ONT, 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.
Last checked .
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.
Planning more than the flight? Our United States guide covers the visa process for Indian passport holders, 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.
The DEN to ONT 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: 1,315.73 km.
Before you book
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Lowest Denver to Ontario airfare today, in 30 days and in 90 days
Cheapest Fare
Fare
Date
Airline
Departure
Lowest Airfare Today
$193
29/09/2026
Delta Air Lines
05:30
Cheapest Airfare Within 30 Days
$189
08/10/2026
Delta Air Lines
05:30
Cheapest Airfare Within 90 Days
$183
07/12/2026
Delta Air Lines
05:30
Book Denver to Ontario Flight Tickets on FlyX
Planning to fly from Denver to Ontario? FlyX lets you compare flight rates, airline timings, layovers, and baggage allowances all in one simple list. From quick non-stop routes to flexible connecting options, finding and booking cheap air tickets has never been easier.
Denver to Ontario Flight Distance, Duration and Time
The aerial distance between Denver and Ontario is approximately 1,316 KM. The flight duration ranges from 2H :20 M up to 7H :00 M depending on whether you book a non-stop flight or a connecting schedule with layovers.
Denver to Ontario Flight Schedule and Timing
Around 20 flights operate on this route, providing plenty of choices for your travel window. The earliest morning flight departs from Denver at 05:00, while the last night flight leaves at 19:35. Flights depart from Denver International and land at Ontario International.
Flight Route Details & Analysis
Flight Details
Information
Route
Denver to Ontario
Aerial Distance
1,316 KM
Flight Duration
2H :20 M - 7H :00 M
Airport Codes
Denver - DEN, Ontario - ONT
Total Flights Available
20 flights (2 direct)
First Flight Departure
Departs at 05:00
Last Flight Departure
Departs at 19:35
Early Morning Flights (12 AM - 8 AM)
5 direct/indirect flights
Morning Flights (8 AM - 12 PM)
6 direct/indirect flights
Afternoon Flights (12 PM - 4 PM)
6 direct/indirect flights
Evening Flights (4 PM - 8 PM)
3 direct/indirect flights
Night Flights (8 PM - 12 AM)
0 direct/indirect flights
Airport Information & Terminals
DEN: Denver airport. Denver 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.
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.
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Denver International
