$77+ Cheap flights from Seattle to St. Louis (SEA - STL)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — STL
Sep 15 — Sep 221
Round-trip
1 adult, Economy
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Find cheap flights from Seattle to St. Louis with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Lambert-St Louis are usually found in January or February, booked 77 days in advance, depart on a Tuesday or Thursday and return on a Friday
Cheap flight deals from Seattle to St. Louis
Cheapest
Best
Last-minute
One-way
Cheapest flights from Seattle to St. LouisExplore the most affordable flight options available from Seattle to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 16, 2026.
Explore the most affordable flight options available from Seattle to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 16, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/97:41 pm -
1 stop21h 16m
Fri 10/234:42 pm -
Nonstop4h 28m
Deal found 8/12![Multiple Airlines logo]()
$260
This CheapOair deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/262:37 pm -
1 stop26h 36m
Tue 9/86:45 pm -
1 stop16h 57m
Deal found 8/11![Frontier logo]()
$261
This Kiwi.com deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/309:45 pm -
1 stop11h 32m
Fri 10/23:19 pm -
Nonstop4h 22m
Deal found 8/14![Multiple Airlines logo]()
$262
This Kiwi.com deal was found by Cheapflights users on 8/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/29:45 pm -
1 stop11h 47m
Sun 10/1110:35 am -
2 stops49h 16m
Deal found 8/10![Frontier logo]()
$263
This Kiwi.com deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/157:06 pm -
1 stop22h 17m
Fri 9/1112:17 pm -
1 stop8h 11m
Deal found 8/14![Frontier logo]()
$264
This Kiwi.com deal was found by Cheapflights users on 8/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/57:06 pm -
1 stop22h 07m
Wed 9/168:10 pm -
2 stops24h 26m
Deal found 8/10![Frontier logo]()
$265
This Kiwi.com deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/88:48 pm -
1 stop12h 44m
Wed 9/98:10 pm -
2 stops15h 32m
Deal found 8/13![Frontier logo]()
$266
This Kiwi.com deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/159:16 pm -
1 stop13h 19m
Thu 10/225:53 pm -
2 stops23h 19m
Deal found 8/13![Frontier logo]()
$268
This Alaska Airlines deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:03 pm -
Nonstop3h 56m
Mon 9/147:36 pm -
Nonstop4h 23m
Deal found 8/13![Alaska Airlines logo]()
$269
This Kiwi.com deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/157:06 pm -
1 stop22h 17m
Wed 9/912:17 pm -
1 stop23h 25m
Deal found 8/14![Frontier logo]()
$270
This Delta deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/146:00 am -
1 stop8h 43m
Wed 10/212:38 pm -
1 stop9h 27m
Deal found 8/13![Delta logo]()
$271
This Kiwi.com deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/99:45 pm -
1 stop11h 32m
Sat 9/128:10 pm -
2 stops24h 26m
Deal found 8/13![Frontier logo]()
$272
Best flights from Seattle to St. LouisDiscover carefully curated flight deals from Seattle to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 16, 2026.
Discover carefully curated flight deals from Seattle to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 16, 2026.
This Alaska Airlines deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2212:35 pm -
Nonstop4h 03m
Mon 9/286:29 am -
Nonstop4h 27m
Deal found 8/12![Alaska Airlines logo]()
$269
This Southwest deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/125:15 am -
2 stops9h 40m
Sun 11/155:45 am -
1 stop9h 30m
Deal found 8/13![Southwest logo]()
$315
This United Airlines deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/127:00 am -
1 stop6h 43m
Mon 11/169:40 am -
2 stops13h 16m
Deal found 8/14![United Airlines logo]()
$332
This Alaska Airlines deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/128:22 am -
Nonstop4h 03m
Sun 11/157:00 am -
Nonstop4h 38m
Deal found 8/15![Alaska Airlines logo]()
$427
This United Airlines deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/125:05 am -
2 stops8h 38m
Sun 11/157:05 pm -
1 stop7h 54m
Deal found 8/14![United Airlines logo]()
$433
This Southwest deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/125:30 am -
2 stops12h 05m
Mon 9/148:30 am -
2 stops11h 05m
Deal found 8/15![Southwest logo]()
$451
This Alaska Airlines deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/128:22 am -
Nonstop4h 03m
Mon 11/167:00 am -
Nonstop4h 38m
Deal found 8/14![Alaska Airlines logo]()
$427
This Southwest deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1812:50 pm -
2 stops9h 50m
Tue 9/228:25 am -
2 stops10h 25m
Deal found 8/11![Southwest logo]()
$474
This United Airlines deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/223:55 pm -
2 stops18h 18m
Sun 10/255:10 am -
1 stop6h 37m
Deal found 8/15![United Airlines logo]()
$482
This Alaska Airlines deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/226:03 pm -
Nonstop3h 56m
Sun 10/254:42 pm -
Nonstop4h 28m
Deal found 8/12![Alaska Airlines logo]()
$447
This Southwest deal was found by Cheapflights users on 8/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/229:40 am -
Nonstop3h 50m
Sun 8/3010:55 am -
Nonstop4h 20m
Deal found 8/15![Southwest logo]()
$519
This Southwest deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2712:05 pm -
Nonstop4h 00m
Mon 8/318:25 am -
Nonstop4h 20m
Deal found 8/12![Southwest logo]()
$537
Last-minute flights from Seattle to St. LouisDiscover last-minute flight deals from Seattle to St. Louis. Data last updated August 16, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to St. Louis. Data last updated August 16, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/157:06 pm -
1 stop22h 17m
Fri 9/1112:17 pm -
1 stop8h 11m
Deal found 8/14![Frontier logo]()
$264
This Kiwi.com deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/157:06 pm -
1 stop22h 17m
Wed 9/912:17 pm -
1 stop23h 25m
Deal found 8/14![Frontier logo]()
$270
This Kiwi.com deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/198:53 pm -
1 stop18h 57m
Wed 9/912:17 pm -
1 stop23h 25m
Deal found 8/14![Frontier logo]()
$274
This CheapOair deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/262:37 pm -
1 stop26h 36m
Tue 9/86:45 pm -
1 stop16h 57m
Deal found 8/11![Frontier logo]()
$261
This Kiwi.com deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/57:06 pm -
1 stop22h 07m
Fri 9/1112:17 pm -
2 stops10h 23m
Deal found 8/13![Frontier logo]()
$265
This Kiwi.com deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/58:05 am -
Nonstop3h 59m
Sat 9/1212:17 pm -
1 stop23h 25m
Deal found 8/14![Multiple Airlines logo]()
$279
This Kiwi.com deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/88:48 pm -
1 stop12h 44m
Wed 9/98:10 pm -
2 stops15h 32m
Deal found 8/13![Frontier logo]()
$266
This Kiwi.com deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/88:48 pm -
1 stop12h 44m
Sat 9/128:10 pm -
2 stops24h 26m
Deal found 8/13![Frontier logo]()
$271
This Kiwi.com deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/99:45 pm -
1 stop11h 32m
Sat 9/128:10 pm -
2 stops24h 26m
Deal found 8/13![Frontier logo]()
$272
This Alaska Airlines deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:03 pm -
Nonstop3h 56m
Mon 9/147:36 pm -
Nonstop4h 23m
Deal found 8/13![Alaska Airlines logo]()
$269
This Kiwi.com deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/118:13 am -
Nonstop4h 08m
Fri 9/118:10 pm -
1 stop20h 58m
Deal found 8/13![Multiple Airlines logo]()
$276
This Kiwi.com deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/309:45 pm -
1 stop11h 32m
Fri 10/23:19 pm -
Nonstop4h 22m
Deal found 8/14![Multiple Airlines logo]()
$262
One-way flights from Seattle to St. LouisSearch for one-way flight options from Seattle to St. Louis. Find affordable one-way fares based on user searches. Data last updated August 16, 2026.
Search for one-way flight options from Seattle to St. Louis. Find affordable one-way fares based on user searches. Data last updated August 16, 2026.
This Super.com deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/99:45 pm -
1 stop11h 32m
Deal found 8/12![Frontier logo]()
$77
This Frontier deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/129:45 pm -
1 stop11h 32m
Deal found 8/11![Frontier logo]()
$78
This Jetabroad deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/119:16 pm -
1 stop23h 23m
Deal found 8/12![Frontier logo]()
$80
This Jetabroad deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/109:16 pm -
1 stop23h 23m
Deal found 8/11![Frontier logo]()
$81
This Kiwi.com deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/97:41 pm -
1 stop21h 16m
Deal found 8/12![Frontier logo]()
$83
This Kiwi.com deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/104:27 pm -
1 stop24h 50m
Deal found 8/11![Frontier logo]()
$85
This Kiwi.com deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/57:06 pm -
1 stop22h 07m
Deal found 8/12![Frontier logo]()
$87
This Kiwi.com deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/119:45 pm -
1 stop11h 47m
Deal found 8/13![Frontier logo]()
$90
This Super.com deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/28:48 pm -
1 stop19h 02m
Deal found 8/13![Frontier logo]()
$91
Find flight deals from Seattle to St. Louis
Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 16, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $260 (Kiwi.com) |
One-way from | $77 (Super.com) |
Popular in | July |
Cheapest in | January |
Average price | $463 |
Good round-trip deal | $407 or less |
Good one-way deal | $278 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Seattle to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 16, 2026.
Use the filters below to find and compare flights from Seattle to St. Louis that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Tue 9/22
12:35 pm-6:38 pm
Nonstop4h 03m
Lambert-St Louis
Mon 9/28
6:29 am-8:56 am
Nonstop4h 27m
$269
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Thu 11/12
5:15 am-4:55 pm
2 stops9h 40m
Lambert-St Louis
Sun 11/15
5:45 am-1:15 pm
1 stop9h 30m
$315
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Thu 11/12
7:00 am-3:43 pm
1 stop6h 43m
Lambert-St Louis
Mon 11/16
9:40 am-8:56 pm
2 stops13h 16m
$332
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Thu 11/12
8:22 am-2:25 pm
Nonstop4h 03m
Lambert-St Louis
Sun 11/15
7:00 am-9:38 am
Nonstop4h 38m
$427
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Thu 11/12
8:22 am-2:25 pm
Nonstop4h 03m
Lambert-St Louis
Mon 11/16
7:00 am-9:38 am
Nonstop4h 38m
$427
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Thu 11/12
5:05 am-3:43 pm
2 stops8h 38m
Lambert-St Louis
Sun 11/15
7:05 pm-12:59 am
1 stop7h 54m
$433
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Thu 10/22
6:03 pm-11:59 pm
Nonstop3h 56m
Lambert-St Louis
Sun 10/25
4:42 pm-7:10 pm
Nonstop4h 28m
$447
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Sat 9/12
5:30 am-7:35 pm
2 stops12h 05m
Lambert-St Louis
Mon 9/14
8:30 am-5:35 pm
2 stops11h 05m
$451
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Fri 9/18
12:50 pm-12:40 am
2 stops9h 50m
Lambert-St Louis
Tue 9/22
8:25 am-4:50 pm
2 stops10h 25m
$474
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Thu 10/22
3:55 pm-12:13 pm
2 stops18h 18m
Lambert-St Louis
Sun 10/25
5:10 am-9:47 am
1 stop6h 37m
$482
Showing 1-10 of 24 resultsSorted by cheapest first
Compare providers for flights from Seattle to St. Louis
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to St. Louis in August.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Seattle-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-St. Louis flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Seattle-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Seattle to St. Louis
Have a flexible travel schedule? Discover the best time to fly to St. Louis from Seattle with our price prediction graph.
SEA-STL
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Seattle to St. Louis
How far ahead should I book a flight from Seattle to St. Louis?
The best time to book flights from Seattle to St. Louis is 76 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
What is the cheapest month to book a flight from Seattle to St. Louis?
Currently, January is the cheapest month in which you can book a flight from Seattle to St. Louis (average of $237). Flying from Seattle to St. Louis in July is currently the most expensive (average of $529). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from SEA to STL?
Find hourly flight availability from Seattle to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 16, 2026.
When flying from Seattle to St. Louis, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
The best insider tips for Seattle to St. Louis flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Seattle to St. Louis trip
Our travel experts
Reviews of airlines servicing St. Louis
Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated August 16, 2026.
Peruse reviews from past customers who have flown with Southwest,Alaska Airlines, andDelta from Seattle to St. Louis to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Food
7.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Food
7.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Food
7.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Food
7.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Food
7.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Food
7.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Related info for your journey
Find useful and relevant information for your journey from Seattle to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsEdwardsville
Fairview Heights
O'Fallon
Fenton
Swansea
Eureka
Maryland Heights
Collinsville
Wentzville
Glencoe
Chesterfield
Farmington
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Seattle and St. Louis flights
Browse other Seattle and St. Louis flight options. Last updated on August 16, 2026.
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Explore flights to St. Louis departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on August 16, 2026.
Top 7 airlines flying from Seattle to St. Louis
Discover the top 7 airlines that operate flights from Seattle to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 16, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$104 | Average$322 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$158 | Average$301 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$181 | Average$587 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$182 | Average$382 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$207 | Average$617 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$216 | Average$348 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$226 | Average$455 | FlexibilityNo cancel fee | On-time75% |