Are direct St Louis to Seattle flights available?
Yes. The current route snapshot includes 6 non-stop options. Availability can change by travel date, so recheck before payment.
STL to SEA
St Louis to Seattle Flights from US$215 + Up to 20% Off
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.
Live fares from the airlines
No hidden charges
Transparent cancellation policy
24×7 booking support
Cheapest fareUS$215Delta Air Lines
Fastest4h 27mgate to gate
Options today90flights on this route
Live flights for Tue, 18 Aug 2026
Review fares, stops, timings and baggage. Use Search or View all flights for the complete search result.
Showing flight options for the selected travel date.
Currency: USD
Delta Air Lines
DL-2868
10:33
2026-08-18
St Louis (STL)
Lambert-St Louis Intl
Lambert-St Louis Intl10H :12 M
1 Stop
DTW
· 3h 44m Detroit (DTW), United States
18:45
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International
FLYX20 Applied
$208
$215
Delta Air Lines
DL-1371
14:10
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl9H :55 M
1 Stop
DTW
· 3h 20m Detroit (DTW), United States
22:05
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International
FLYX20 Applied
$208
$215
Delta Air Lines
DL-2455
14:32
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl6H :12 M
1 Stop
SLC
· 0h 52m Salt Lake City (SLC), United States
18:44
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International
FLYX20 Applied
$208
$215
Delta Air Lines
DL-3185
17:34
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl6H :26 M
1 Stop
MSP
· 0h 49m Minneapolis (MSP), United States
22:00
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International
FLYX20 Applied
$208
$215
American Airlines
AA-7628
06:02
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl4H :28 M
Non Stop
08:30
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International
FLYX20 Applied
$238
$246
American Airlines
AA-9271
14:50
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl4H :27 M
Non Stop
17:17
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International
FLYX20 Applied
$238
$246
American Airlines
AA-9443
19:56
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl4H :28 M
Non Stop
22:24
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International
FLYX20 Applied
$238
$246
American Airlines
AA-2261
05:42
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl7H :16 M
1 Stop
DFW
· 0h 52m Dallas (DFW), United States
10:58
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International
FLYX20 Applied
$258
$266
American Airlines
AA-1926
06:00
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl8H :34 M
1 Stop
ORD
· 2h 11m Chicago (ORD), United States
12:34
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International
FLYX20 Applied
$258
$266
United Airlines
UA-6258
06:15
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl10H :37 M
1 Stop
IAH
· 3h 32m Houston (IAH), United States
14:52
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International
FLYX20 Applied
$258
$266
American Airlines
AA-2574
08:00
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl8H :03 M
1 Stop
PHX
· 1h 37m Phoenix (PHX), United States
14:03
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International
FLYX20 Applied
$258
$266
United Airlines
UA-567
08:00
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl10H :07 M
1 Stop
ORD
· 3h 56m Chicago (ORD), United States
16:07
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International
FLYX20 Applied
$258
$266
United Airlines
UA-4585
08:35
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl8H :17 M
1 Stop
IAH
· 1h 12m Houston (IAH), United States
14:52
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International
FLYX20 Applied
$258
$266
American Airlines
AA-1959
08:36
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl8H :20 M
1 Stop
DFW
· 2h 06m Dallas (DFW), United States
14:56
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International
FLYX20 Applied
$258
$266
American Airlines
AA-1959
08:36
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl10H :05 M
1 Stop
DFW
· 3h 51m Dallas (DFW), United States
16:41
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International
FLYX20 Applied
$258
$266
United Airlines
UA-4506
08:40
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl9H :26 M
1 Stop
IAD
· 1h 26m Washington (IAD), United States
16:06
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International
FLYX20 Applied
$258
$266
United Airlines
UA-4601
08:50
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl9H :17 M
1 Stop
ORD
· 3h 04m Chicago (ORD), United States
16:07
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International
FLYX20 Applied
$258
$266
American Airlines
AA-3333
10:16
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl8H :25 M
1 Stop
DFW
· 2h 17m Dallas (DFW), United States
16:41
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International
FLYX20 Applied
$258
$266
United Airlines
UA-4517
10:53
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl10H :14 M
1 Stop
ORD
· 3h 52m Chicago (ORD), United States
19:07
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International
FLYX20 Applied
$258
$266
United Airlines
UA-5566
11:15
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl9H :53 M
1 Stop
IAH
· 2h 48m Houston (IAH), United States
19:08
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International
FLYX20 Applied
$258
$266
United Airlines
UA-2654
12:59
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl8H :08 M
1 Stop
ORD
· 1h 50m Chicago (ORD), United States
19:07
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International
FLYX20 Applied
$258
$266
United Airlines
UA-1380
13:36
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl6H :06 M
1 Stop
DEN
· 0h 45m Denver (DEN), United States
17:42
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International
FLYX20 Applied
$258
$266
Recommended hotels in Seattle
Stay options near the arrival city for the same travel date.
No hotel result available
Open hotel search to check current stays for this destination.
United Airlines
UA-6156
15:13
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl8H :23 M
1 Stop
IAH
· 1h 20m Houston (IAH), United States
21:36
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International
FLYX20 Applied
$258
$266
American Airlines
AA-831
15:25
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl8H :34 M
1 Stop
CLT
· 0h 58m Charlotte (CLT), United States
21:59
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International
FLYX20 Applied
$258
$266
United Airlines
UA-333
16:40
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl6H :51 M
1 Stop
DEN
· 1h 20m Denver (DEN), United States
21:31
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International
FLYX20 Applied
$258
$266
American Airlines
AA-4259
16:54
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl9H :05 M
1 Stop
ORD
· 2h 38m Chicago (ORD), United States
23:59
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International
FLYX20 Applied
$258
$266
No flights match the selected filters. Clear filters or open full search.
Fare highlights
Selected flight highlights for 18 Aug 2026.
Lowest fare
$215
Delta Air Lines
10:33
Earliest departure
$266
American Airlines
05:42
Shortest duration
$246
American Airlines
14:50
Night
00:00-05:59
$266
American Airlines at 05:42
Morning
06:00-11:59
$215
Delta Air Lines at 10:33
Afternoon
12:00-17:59
$215
Delta Air Lines at 14:10
Evening
18:00-23:59
$246
American Airlines at 19:56
St Louis to Seattle flight booking guide
Quick answers to the most common questions about flying St Louis to Seattle.
Best time or month to book
There is no permanently cheapest month because airline inventory changes continuously. As a practical starting point, compare nearby dates and begin checking international trips 6–12 weeks before departure; peak holidays may need earlier booking.
Cheapest days for this route
Among the dates currently shown, Tuesday has the lowest displayed fare at $215. This is a live snapshot, not a guaranteed weekly rule.
Baggage rules
Allowance is fare-specific, not just airline-specific. Current cards show examples such as 0 Pieces check-in baggage. Open the fare choices and verify cabin/check-in baggage before continuing.
Cancellation and refund explanation
Refundable and non-refundable labels are shown on each card. Exact airline cancellation charges, no-show rules and refund timelines are verified for the selected fare before booking; promotional discounts and applicable charges are adjusted from any refund.
Secure booking support
FlyX rechecks the live fare before payment, shows the payable amount and provides 24×7 booking support. Payment, refund, cancellation and help links are available in the footer.
Airlines flying from St Louis to Seattle
Compare fares, stops, baggage and refundability across the airlines flying this route.
United Airlines St Louis to Seattle flights
United Airlines cheap flights St Louis to Seattle
Fares start from $266 on this route.
St Louis to Seattle United Airlines flight schedule
34 departures — compare timings in the list above.
American Airlines St Louis to Seattle flights
American Airlines cheap flights St Louis to Seattle
Fares start from $246 on this route.
St Louis to Seattle direct American Airlines flights
3 non-stop flights currently available.
St Louis to Seattle American Airlines flight schedule
27 departures — compare timings in the list above.
Delta Air Lines St Louis to Seattle flights
Delta Air Lines cheap flights St Louis to Seattle
Fares start from $215 on this route.
St Louis to Seattle Delta Air Lines flight schedule
25 departures — compare timings in the list above.
Alaska Airlines St Louis to Seattle flights
Alaska Airlines cheap flights St Louis to Seattle
Fares start from $273 on this route.
St Louis to Seattle direct Alaska Airlines flights
3 non-stop flights currently available.
St Louis to Seattle Alaska Airlines flight schedule
4 departures — compare timings in the list above.
St Louis to Seattle flight details
| Cheapest fare | US$215 · Tue, 18 Aug |
|---|---|
| Fastest flight duration | 4h 27m · American Airlines |
| First departure of the day | 05:42 · American Airlines |
| Last departure of the day | 20:07 · American Airlines |
| Flights currently available | 90 |
| Direct / non-stop options | 6 |
| Popular airlines on this route | United Airlines, American Airlines, Delta Air Lines, Alaska Airlines |
| Airport codes | St Louis–STL, Seattle–SEA |
Fares and timings are indicative — the exact price is confirmed with the airline when you search.
St Louis to Seattle flight schedule, timing and fares
St Louis to Seattle flight schedule and timing
Around 90 flights operate on this route, including 6 non-stop options. Departures run through the day — the first flight leaves around 05:42 and the last around 20:07. The fastest flight takes about 4h 27m.
Morning vs evening St Louis–Seattle fares
Lowest fare by departure window: Morning from $215, Afternoon from $215, Evening from $246, Night from $266. Early-morning and late-night flights are often cheaper than peak daytime slots.
What is today’s lowest airfare from St Louis to Seattle?
The lowest fare we are currently showing is US$215, 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 St Louis to Seattle?
Domestic fares are usually priced per leg, so two one-ways often cost about the same as a round-trip and keep your return date flexible. Round-trip is worth choosing when you want a single PNR for both legs, and eligible coupons like FLYX20 apply either way.
Which airlines should I consider for St Louis to Seattle?
United Airlines (34 flights, from $266), American Airlines (27 flights, from $246), Delta Air Lines (25 flights, from $215), Alaska Airlines (4 flights, from $273). Compare fare type, baggage and refundability — the cheapest airline is not always the best value for your dates.
Web check-in for your St Louis to Seattle flight
Most airlines open web check-in 24–48 hours before departure on their own website or app using your PNR. Checking in early lets you pick better seats free of charge on many fares; FlyX also links every booking’s airline check-in page from Web Check-in.
How to book a St Louis to Seattle flight on FlyX
- 1Enter your travel details
Choose one-way or round-trip, pick your dates and travellers in the search form above.
- 2Compare live results
Sort or filter the St Louis–Seattle results by price, departure time, stops and airline.
- 3Open the fare choices
Check baggage allowance and refundability for each fare type before continuing.
- 4Review the final price
FlyX rechecks the live fare with the airline; any eligible coupon is applied automatically.
- 5Pay securely
UPI, cards, net banking and wallets supported; your e-ticket is emailed within minutes.
Why book your St Louis to Seattle flight with FlyX?
If you are looking for St Louis to Seattle flight tickets at the best possible fare, FlyX keeps the process simple and transparent. Enter your dates and travellers, compare live fares across every major airline on this route, and filter by price, departure time, stops or airline to find the flight that actually fits your plan. Every fare you see is rechecked live with the airline before payment, so the price you approve is the price you pay — no hidden charges added at checkout.
And that is not all — eligible discounts like FLYX20 are applied automatically on the review page, payments run over 256-bit SSL with UPI, cards, net banking and wallets, and our 24x7 support team backs every booking as an IATA-accredited travel company. Refund and cancellation rules are shown clearly for each fare before you pay, and your e-ticket lands in your inbox within minutes. So why wait? Book your St Louis to Seattle flight on FlyX and take off with genuine savings today.
St Louis to Seattle flight offers & coupon codes
| Coupon code | Offer | Max saving |
|---|---|---|
| FLYX20 | Up to 20% Off on Flights | ₹1,500 |
Your discount is applied automatically on the review page before you pay. View full terms.
Frequently asked questions - St Louis to Seattle flights
Is it worth booking St Louis to Seattle flights in advance?
Yes, booking flights in advance helps you secure cheap flight tickets. Comparing air ticket prices 3–4 weeks early gives you better visibility of airline timings, baggage policies, and fare rules before high-demand periods push prices up.
How far is St Louis from Seattle by air?
The approximate direct air distance between St Louis (STL) and Seattle (SEA) is 2,744.34 km. The actual flight duration and route path vary depending on airline schedules and wind conditions.
Are there non-stop flights from STL to SEA?
Non-stop flight availability depends on the airline schedule and departure date. You can filter the live search results by stops to view direct flights, one-stop connections, and transit flights instantly.
Why does the price change after clicking Book Now?
Airline seat inventory and airfares change dynamically in real-time. Selecting 'Book Now' runs a live fare verification check to ensure you get the most accurate price before final booking confirmation.
Can I compare nearby dates?
Yes, you can easily compare flights for nearby dates. Select any date on the date calendar strip to refresh the fares, compare air ticket pricing, and choose the most budget-friendly travel day.
St Louis to Seattle - what to expect when booking
The STL 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: 2,744.34 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.
Book Cheapest Flight from St Louis to Seattle on FlyX
Securing the best airfare from St Louis to Seattle is all about planning. FlyX's real-time fare tracking system allows you to check flight options and lock in the lowest ticket prices before they rise:
- Book at least 3-4 weeks in advance to secure the most competitive St Louis to Seattle airfares.
- Consider traveling mid-week (Tuesdays or Wednesdays) to bypass weekend pricing surges.
- Early morning or late-night departure flights consistently offer lower fares than afternoon slots.
- Use our live calendar view above to easily spot fare changes on nearby dates.
Find the Lowest airfare from St Louis to Seattle
| Cheapest Fare | Fare | Date | Airline | Departure |
|---|---|---|---|---|
| Lowest Airfare Today | $215 | 18/08/2026 | Delta Air Lines | 10:33 |
| Cheapest Airfare Within 30 Days | $211 | 29/08/2026 | Delta Air Lines | 10:33 |
| Cheapest Airfare Within 90 Days | $205 | 28/10/2026 | Delta Air Lines | 10:33 |
Book St Louis to Seattle Flight Tickets on FlyX
Planning to fly from St Louis to Seattle? 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.
St Louis to Seattle Flight Distance, Duration and Time
The aerial distance between St Louis and Seattle is approximately 2,744 KM. The flight duration ranges from 4H :27 M up to 21H :04 M depending on whether you book a non-stop flight or a connecting schedule with layovers.
St Louis to Seattle Flight Schedule and Timing
Around 90 flights operate on this route, providing plenty of choices for your travel window. The earliest morning flight departs from St Louis at 05:42, while the last night flight leaves at 20:07. Flights depart from Lambert-St Louis Intl and land at Seattle/tacoma International.
Flight Route Details & Analysis
| Flight Details | Information |
|---|---|
| Route | St Louis to Seattle |
| Aerial Distance | 2,744 KM |
| Flight Duration | 4H :27 M - 21H :04 M |
| Airport Codes | St Louis - STL, Seattle - SEA |
| Total Flights Available | 90 flights (6 direct) |
| First Flight Departure | Departs at 05:42 |
| Last Flight Departure | Departs at 20:07 |
| Early Morning Flights (12 AM - 8 AM) | 25 direct/indirect flights |
| Morning Flights (8 AM - 12 PM) | 32 direct/indirect flights |
| Afternoon Flights (12 PM - 4 PM) | 19 direct/indirect flights |
| Evening Flights (4 PM - 8 PM) | 13 direct/indirect flights |
| Night Flights (8 PM - 12 AM) | 1 direct/indirect flights |
Airport Information & Terminals
STL: St. Louis airport. St. Louis 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.
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.
