Are direct Seattle to St Louis flights available?
Yes. The current route snapshot includes 6 non-stop options. Availability can change by travel date, so recheck before payment.
SEA to STL
Seattle to St Louis 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
Fastest3h 51mgate to gate
Options today101flights 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-810
23:10
2026-08-18
SEATTLE (SEA)
Seattle/tacoma International
Seattle/tacoma International8H :27 M
1 Stop
DTW
· 2h 37m Detroit (DTW), United States
09:37
2026-08-19
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl
FLYX20 Applied
$208
$215
American Airlines
AA-9443
13:06
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International3H :51 M
Non Stop
18:57
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl
FLYX20 Applied
$238
$246
American Airlines
AA-7468
18:04
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International3H :55 M
Non Stop
23:59
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl
FLYX20 Applied
$238
$246
United Airlines
UA-2601
05:00
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International5H :40 M
1 Stop
DEN
· 0h 50m Denver (DEN), United States
12:40
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl
FLYX20 Applied
$258
$266
American Airlines
AA-3583
06:10
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International9H :27 M
1 Stop
PHX
· 3h 15m Phoenix (PHX), United States
17:37
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl
FLYX20 Applied
$258
$266
United Airlines
UA-2135
07:00
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International9H :04 M
1 Stop
IAH
· 2h 22m Houston (IAH), United States
18:04
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl
FLYX20 Applied
$258
$266
American Airlines
AA-1667
07:40
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International8H :25 M
1 Stop
DFW
· 2h 39m Dallas (DFW), United States
18:05
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl
FLYX20 Applied
$258
$266
American Airlines
AA-717
14:07
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International7H :35 M
1 Stop
DFW
· 1h 43m Dallas (DFW), United States
23:42
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl
FLYX20 Applied
$258
$266
United Airlines
UA-2379
23:59
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International8H :11 M
1 Stop
IAH
· 1h 43m Houston (IAH), United States
10:10
2026-08-19
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl
FLYX20 Applied
$258
$266
Alaska Airlines
AS-647
13:06
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International3H :51 M
Non Stop
18:57
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl
FLYX20 Applied
$265
$273
Alaska Airlines
AS-615
18:04
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International3H :55 M
Non Stop
23:59
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl
FLYX20 Applied
$265
$273
American Airlines
AA-4988
11:40
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International9H :19 M
1 Stop
LAX
· 2h 37m Los Angeles (LAX), United States
22:59
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl
FLYX20 Applied
$282
$290
Delta Air Lines
DL-941
12:05
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International9H :21 M
1 Stop
MSP
· 4h 17m Minneapolis (MSP), United States
23:26
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl
FLYX20 Applied
$287
$295
Delta Air Lines
DL-941
12:05
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International18H :32 M
1 Stop
MSP
· 13h 18m Minneapolis (MSP), United States
08:37
2026-08-19
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl
FLYX20 Applied
$287
$295
Delta Air Lines
DL-941
12:05
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International20H :18 M
1 Stop
MSP
· 15h 13m Minneapolis (MSP), United States
10:23
2026-08-19
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl
FLYX20 Applied
$287
$295
United Airlines
UA-1265
17:13
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International13H :26 M
1 Stop
ORD
· 7h 48m Chicago (ORD), United States
08:39
2026-08-19
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl
FLYX20 Applied
$317
$325
United Airlines
UA-1265
17:13
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International20H :25 M
1 Stop
ORD
· 14h 50m Chicago (ORD), United States
15:38
2026-08-19
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl
FLYX20 Applied
$317
$325
Alaska Airlines
AS-2432
06:42
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International7H :55 M
1 Stop
PDX
· 3h 12m Portland (PDX), United States
16:37
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl
FLYX20 Applied
$322
$329
United Airlines
UA-2601
05:00
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International13H :46 M
1 Stop
DEN
· 8h 50m Denver (DEN), United States
20:46
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl
FLYX20 Applied
$326
$334
United Airlines
UA-1265
17:13
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International16H :49 M
1 Stop
ORD
· 11h 12m Chicago (ORD), United States
12:02
2026-08-19
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl
FLYX20 Applied
$334
$342
United Airlines
UA-1265
17:13
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International19H :44 M
1 Stop
ORD
· 14h 13m Chicago (ORD), United States
14:57
2026-08-19
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl
FLYX20 Applied
$334
$342
American Airlines
AA-1476
15:35
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International6H :39 M
1 Stop
ORD
· 0h 53m Chicago (ORD), United States
00:14
2026-08-19
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl
FLYX20 Applied
$339
$347
Recommended hotels in St Louis
Stay options near the arrival city for the same travel date.
Best Western Plus Louisa
- 18199 US-23, Louisa, KY 41230 ,
Free WiFiACBreakfast
Room availability is checked live
American Airlines
AA-2003
23:16
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International8H :08 M
1 Stop
DFW
· 2h 20m Dallas (DFW), United States
09:24
2026-08-19
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl
FLYX20 Applied
$339
$347
American Airlines
AA-2379
23:56
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International6H :28 M
1 Stop
ORD
· 0h 55m Chicago (ORD), United States
08:24
2026-08-19
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl
FLYX20 Applied
$339
$347
United Airlines
UA-2618
07:00
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International6H :38 M
1 Stop
ORD
· 0h 52m Chicago (ORD), United States
15:38
2026-08-18
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl
FLYX20 Applied
$340
$348
United Airlines
UA-747
23:00
2026-08-18
SEATTLE (SEA)Seattle/tacoma International
Seattle/tacoma International7H :39 M
1 Stop
ORD
· 1h 59m Chicago (ORD), United States
08:39
2026-08-19
St Louis (STL)Lambert-St Louis Intl
Lambert-St Louis Intl
FLYX20 Applied
$340
$348
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
23:10
Earliest departure
$266
United Airlines
05:00
Shortest duration
$246
American Airlines
13:06
Night
00:00-05:59
$266
United Airlines at 05:00
Morning
06:00-11:59
$266
American Airlines at 06:10
Afternoon
12:00-17:59
$246
American Airlines at 13:06
Evening
18:00-23:59
$215
Delta Air Lines at 23:10
Seattle to St Louis flight booking guide
Quick answers to the most common questions about flying Seattle to St Louis.
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 Seattle to St Louis
Compare fares, stops, baggage and refundability across the airlines flying this route.
Delta Air Lines Seattle to St Louis flights
Delta Air Lines cheap flights Seattle to St Louis
Fares start from $215 on this route.
Seattle to St Louis Delta Air Lines flight schedule
33 departures — compare timings in the list above.
American Airlines Seattle to St Louis flights
American Airlines cheap flights Seattle to St Louis
Fares start from $246 on this route.
Seattle to St Louis direct American Airlines flights
3 non-stop flights currently available.
Seattle to St Louis American Airlines flight schedule
33 departures — compare timings in the list above.
United Airlines Seattle to St Louis flights
United Airlines cheap flights Seattle to St Louis
Fares start from $266 on this route.
Seattle to St Louis United Airlines flight schedule
25 departures — compare timings in the list above.
Alaska Airlines Seattle to St Louis flights
Alaska Airlines cheap flights Seattle to St Louis
Fares start from $273 on this route.
Seattle to St Louis direct Alaska Airlines flights
3 non-stop flights currently available.
Seattle to St Louis Alaska Airlines flight schedule
10 departures — compare timings in the list above.
Seattle to St Louis flight details
| Cheapest fare | US$215 · Tue, 18 Aug |
|---|---|
| Fastest flight duration | 3h 51m · American Airlines |
| First departure of the day | 05:00 · United Airlines |
| Last departure of the day | 23:59 · United Airlines |
| Flights currently available | 101 |
| Direct / non-stop options | 6 |
| Popular airlines on this route | Delta Air Lines, American Airlines, United Airlines, Alaska Airlines |
| Airport codes | Seattle–SEA, St Louis–STL |
Fares and timings are indicative — the exact price is confirmed with the airline when you search.
Seattle to St Louis flight schedule, timing and fares
Seattle to St Louis flight schedule and timing
Around 101 flights operate on this route, including 6 non-stop options. Departures run through the day — the first flight leaves around 05:00 and the last around 23:59. The fastest flight takes about 3h 51m.
Morning vs evening Seattle–St Louis fares
Lowest fare by departure window: Evening from $215, Afternoon from $246, Night from $266, Morning from $266. Early-morning and late-night flights are often cheaper than peak daytime slots.
What is today’s lowest airfare from Seattle to St Louis?
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 Seattle to St Louis?
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 Seattle to St Louis?
Delta Air Lines (33 flights, from $215), American Airlines (33 flights, from $246), United Airlines (25 flights, from $266), Alaska Airlines (10 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 Seattle to St Louis 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 Seattle to St Louis 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 Seattle–St Louis 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 Seattle to St Louis flight with FlyX?
If you are looking for Seattle to St Louis 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 Seattle to St Louis flight on FlyX and take off with genuine savings today.
Seattle to St Louis 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 - Seattle to St Louis flights
Is it worth booking Seattle to St Louis 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 Seattle from St Louis by air?
The approximate direct air distance between Seattle (SEA) and St Louis (STL) 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 SEA to STL?
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.
Seattle to St Louis - what to expect when booking
The SEA to STL 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 Seattle to St Louis on FlyX
Securing the best airfare from Seattle to St Louis 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 Seattle to St Louis 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 Seattle to St Louis
| Cheapest Fare | Fare | Date | Airline | Departure |
|---|---|---|---|---|
| Lowest Airfare Today | $215 | 18/08/2026 | Delta Air Lines | 23:10 |
| Cheapest Airfare Within 30 Days | $211 | 29/08/2026 | Delta Air Lines | 23:10 |
| Cheapest Airfare Within 90 Days | $205 | 28/10/2026 | Delta Air Lines | 23:10 |
Book Seattle to St Louis Flight Tickets on FlyX
Planning to fly from Seattle to St Louis? 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.
Seattle to St Louis Flight Distance, Duration and Time
The aerial distance between Seattle and St Louis is approximately 2,744 KM. The flight duration ranges from 3H :51 M up to 26H :37 M depending on whether you book a non-stop flight or a connecting schedule with layovers.
Seattle to St Louis Flight Schedule and Timing
Around 101 flights operate on this route, providing plenty of choices for your travel window. The earliest morning flight departs from Seattle at 05:00, while the last night flight leaves at 23:59. Flights depart from Seattle/tacoma International and land at Lambert-St Louis Intl.
Flight Route Details & Analysis
| Flight Details | Information |
|---|---|
| Route | Seattle to St Louis |
| Aerial Distance | 2,744 KM |
| Flight Duration | 3H :51 M - 26H :37 M |
| Airport Codes | Seattle - SEA, St Louis - STL |
| Total Flights Available | 101 flights (6 direct) |
| First Flight Departure | Departs at 05:00 |
| Last Flight Departure | Departs at 23:59 |
| Early Morning Flights (12 AM - 8 AM) | 25 direct/indirect flights |
| Morning Flights (8 AM - 12 PM) | 23 direct/indirect flights |
| Afternoon Flights (12 PM - 4 PM) | 24 direct/indirect flights |
| Evening Flights (4 PM - 8 PM) | 7 direct/indirect flights |
| Night Flights (8 PM - 12 AM) | 22 direct/indirect flights |
Airport Information & Terminals
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.
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.
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.
