$104+ 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 11/7. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — STL
Sep 9 — Sep 161
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 10, 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 10, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/8. 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 9/87:06 pm -
1 stop22h 11m
Mon 9/148:10 pm -
1 stop20h 58m
Deal found 8/8![Frontier logo]()
$286
This Frontier deal was found by Cheapflights users on 8/5. 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.
Sun 9/139:45 pm -
1 stop11h 32m
Fri 9/2512:17 pm -
1 stop8h 11m
Deal found 8/5![Frontier logo]()
$288
This Kiwi.com deal was found by Cheapflights users on 8/7. 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 8/277:06 pm -
2 stops20h 16m
Mon 8/317:58 pm -
1 stop15h 21m
Deal found 8/7![Frontier logo]()
$289
This Southwest deal was found by Cheapflights users on 8/5. 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.
Wed 9/161:45 pm -
1 stop6h 55m
Wed 9/2311:55 am -
2 stops10h 25m
Deal found 8/5![Southwest logo]()
$293
This Kiwi.com deal was found by Cheapflights users on 8/6. 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 10/227:41 pm -
1 stop21h 34m
Mon 10/268:10 pm -
1 stop15h 41m
Deal found 8/6![Frontier logo]()
$294
This Kiwi.com deal was found by Cheapflights users on 8/6. 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 8/267:06 pm -
2 stops19h 05m
Mon 8/317:58 pm -
1 stop15h 21m
Deal found 8/6![Frontier logo]()
$296
This Super.com deal was found by Cheapflights users on 8/9. 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.
Thu 9/39:29 pm -
1 stop18h 21m
Tue 9/86:45 pm -
1 stop16h 57m
Deal found 8/9![Frontier logo]()
$297
This Southwest deal was found by Cheapflights users on 8/5. 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 10/226:50 pm -
1 stop13h 10m
Sun 10/256:20 am -
1 stop6h 10m
Deal found 8/5![Southwest logo]()
$298
This Kiwi.com deal was found by Cheapflights users on 8/6. 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 8/292:37 pm -
2 stops23h 34m
Mon 8/317:58 pm -
1 stop15h 21m
Deal found 8/6![Frontier logo]()
$301
This Southwest deal was found by Cheapflights users on 8/8. 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 9/1012:50 pm -
2 stops9h 50m
Tue 9/158:25 am -
2 stops10h 25m
Deal found 8/8![Southwest logo]()
$303
This Kiwi.com deal was found by Cheapflights users on 8/8. 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.
Sun 8/309:29 pm -
1 stop18h 21m
Mon 8/317:58 pm -
1 stop15h 21m
Deal found 8/8![Frontier logo]()
$304
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 10, 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 10, 2026.
This Alaska Airlines deal was found by Cheapflights users on 8/6. 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 9/228:13 am -
Nonstop4h 08m
Mon 9/286:08 pm -
1 stop6h 31m
Deal found 8/6![Alaska Airlines logo]()
$337
This United Airlines deal was found by Cheapflights users on 8/5. 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.
Mon 9/2111:04 pm -
2 stops10h 53m
Wed 9/231:36 pm -
2 stops11h 50m
Deal found 8/5![United Airlines logo]()
$337
This Southwest deal was found by Cheapflights users on 8/7. 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.
Wed 10/2812:05 pm -
2 stops8h 00m
Thu 11/55:05 am -
2 stops10h 50m
Deal found 8/7![Southwest logo]()
$389
This Alaska Airlines deal was found by Cheapflights users on 8/7. 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.
Sun 9/66:03 pm -
Nonstop3h 56m
Fri 9/116:08 pm -
1 stop6h 31m
Deal found 8/7![Alaska Airlines logo]()
$363
This Southwest deal was found by Cheapflights users on 8/9. 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.
Wed 10/712:05 pm -
2 stops8h 00m
Sat 10/108:25 am -
2 stops13h 35m
Deal found 8/9![Southwest logo]()
$404
This Alaska Airlines deal was found by Cheapflights users on 8/9. 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.
Wed 9/238:13 am -
Nonstop4h 08m
Sun 9/277:36 pm -
Nonstop4h 23m
Deal found 8/9![Alaska Airlines logo]()
$405
This Southwest deal was found by Cheapflights users on 8/8. 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.
Sun 9/65:10 am -
2 stops11h 00m
Sun 9/138:30 am -
1 stop11h 35m
Deal found 8/8![Southwest logo]()
$414
This Alaska Airlines deal was found by Cheapflights users on 8/8. 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.
Sat 10/108:39 am -
1 stop9h 09m
Wed 10/147:02 am -
Nonstop4h 33m
Deal found 8/8![Alaska Airlines logo]()
$417
This Southwest deal was found by Cheapflights users on 8/5. 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 10/211:10 am -
2 stops8h 35m
Sun 10/117:00 pm -
2 stops8h 25m
Deal found 8/5![Southwest logo]()
$447
This Alaska Airlines deal was found by Cheapflights users on 8/7. 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.
Sun 9/136:03 pm -
Nonstop3h 56m
Fri 9/187:36 pm -
Nonstop4h 23m
Deal found 8/7![Alaska Airlines logo]()
$427
Last-minute flights from Seattle to St. LouisDiscover last-minute flight deals from Seattle to St. Louis. Data last updated August 10, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to St. Louis. Data last updated August 10, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 8/6. 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 8/267:06 pm -
2 stops19h 05m
Mon 8/317:58 pm -
1 stop15h 21m
Deal found 8/6![Frontier logo]()
$296
This Kiwi.com deal was found by Cheapflights users on 8/7. 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 8/277:06 pm -
2 stops20h 16m
Mon 8/317:58 pm -
1 stop15h 21m
Deal found 8/7![Frontier logo]()
$289
This Kiwi.com deal was found by Cheapflights users on 8/6. 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 8/292:37 pm -
2 stops23h 34m
Mon 8/317:58 pm -
1 stop15h 21m
Deal found 8/6![Frontier logo]()
$301
This Kiwi.com deal was found by Cheapflights users on 8/8. 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.
Sun 8/309:29 pm -
1 stop18h 21m
Mon 8/317:58 pm -
1 stop15h 21m
Deal found 8/8![Frontier logo]()
$304
This Super.com deal was found by Cheapflights users on 8/9. 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.
Thu 9/39:29 pm -
1 stop18h 21m
Tue 9/86:45 pm -
1 stop16h 57m
Deal found 8/9![Frontier logo]()
$297
This Kiwi.com deal was found by Cheapflights users on 8/8. 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 9/87:06 pm -
1 stop22h 11m
Mon 9/148:10 pm -
1 stop20h 58m
Deal found 8/8![Frontier logo]()
$286
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/87:06 pm -
1 stop22h 11m
Sun 9/1312:27 pm -
1 stop23h 15m
Deal found 8/10![Frontier logo]()
$298
This Southwest deal was found by Cheapflights users on 8/8. 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 9/1012:50 pm -
2 stops9h 50m
Tue 9/158:25 am -
2 stops10h 25m
Deal found 8/8![Southwest logo]()
$303
This Frontier deal was found by Cheapflights users on 8/5. 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.
Sun 9/139:45 pm -
1 stop11h 32m
Fri 9/2512:17 pm -
1 stop8h 11m
Deal found 8/5![Frontier logo]()
$288
This Southwest deal was found by Cheapflights users on 8/5. 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.
Wed 9/161:45 pm -
1 stop6h 55m
Wed 9/2311:55 am -
2 stops10h 25m
Deal found 8/5![Southwest logo]()
$293
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 10, 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 10, 2026.
This Southwest deal was found by Cheapflights users on 8/5. 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 11/711:45 am -
1 stop6h 15m
Deal found 8/5![Southwest logo]()
$104
This American Airlines deal was found by Cheapflights users on 8/7. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/33:41 pm -
1 stop6h 46m
Deal found 8/7![American Airlines logo]()
$108
This Delta deal was found by Cheapflights users on 8/7. 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.
Tue 10/611:10 pm -
1 stop8h 34m
Deal found 8/7![Delta logo]()
$109
This Southwest deal was found by Cheapflights users on 8/7. 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 10/94:15 pm -
1 stop5h 30m
Deal found 8/7![Southwest logo]()
$114
This Southwest deal was found by Cheapflights users on 8/6. 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 11/59:25 pm -
1 stop12h 25m
Deal found 8/6![Southwest logo]()
$119
This Kiwi.com deal was found by Cheapflights users on 8/8. 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 9/228:15 pm -
2 stops21h 02m
Deal found 8/8![Frontier logo]()
$131
This Kiwi.com deal was found by Cheapflights users on 8/8. 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 9/118:15 pm -
2 stops37h 52m
Deal found 8/8![Frontier logo]()
$133
This Kiwi.com deal was found by Cheapflights users on 8/7. 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 10/68:15 pm -
2 stops21h 02m
Deal found 8/7![Frontier logo]()
$135
This Trip.com deal was found by Cheapflights users on 8/9. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/87:41 pm -
1 stop21h 34m
Deal found 8/9![Frontier logo]()
$136
This Kiwi.com deal was found by Cheapflights users on 8/8. 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 11/57:41 pm -
1 stop21h 34m
Deal found 8/8![Frontier logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 8/7. 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 9/97:25 pm -
2 stops45h 52m
Deal found 8/7![Frontier logo]()
$138
This Super.com deal was found by Cheapflights users on 8/7. 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.
Mon 8/319:29 pm -
1 stop18h 21m
Deal found 8/7![Frontier logo]()
$147
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 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $262 (United Airlines) |
One-way from | $104 (Southwest) |
Popular in | July |
Cheapest in | January |
Average price | $463 |
Good round-trip deal | $407 or less |
Good one-way deal | $283 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 10, 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
8:13 am-2:21 pm
Nonstop4h 08m
Lambert-St Louis
Mon 9/28
6:08 pm-10:39 pm
1 stop6h 31m
$337
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Mon 9/21
11:04 pm-11:57 am
2 stops10h 53m
Lambert-St Louis
Wed 9/23
1:36 pm-11:26 pm
2 stops11h 50m
$337
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Sun 9/6
6:03 pm-11:59 pm
Nonstop3h 56m
Lambert-St Louis
Fri 9/11
6:08 pm-10:39 pm
1 stop6h 31m
$363
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Wed 10/28
12:05 pm-10:05 pm
2 stops8h 00m
Lambert-St Louis
Thu 11/5
5:05 am-1:55 pm
2 stops10h 50m
$389
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Wed 10/7
12:05 pm-10:05 pm
2 stops8h 00m
Lambert-St Louis
Sat 10/10
8:25 am-8:00 pm
2 stops13h 35m
$404
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Wed 9/23
8:13 am-2:21 pm
Nonstop4h 08m
Lambert-St Louis
Sun 9/27
7:36 pm-9:59 pm
Nonstop4h 23m
$405
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Sun 9/6
5:10 am-6:10 pm
2 stops11h 00m
Lambert-St Louis
Sun 9/13
8:30 am-6:05 pm
1 stop11h 35m
$414
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Sat 10/10
8:39 am-7:48 pm
1 stop9h 09m
Lambert-St Louis
Wed 10/14
7:02 am-9:35 am
Nonstop4h 33m
$417
Quickest round-trip
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Sun 9/13
6:03 pm-11:59 pm
Nonstop3h 56m
Lambert-St Louis
Fri 9/18
7:36 pm-9:59 pm
Nonstop4h 23m
$427
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Fri 10/2
11:10 am-9:45 pm
2 stops8h 35m
Lambert-St Louis
Sun 10/11
7:00 pm-1:25 am
2 stops8h 25m
$447
Showing 1-10 of 21 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
Prices
Airlines
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 10, 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 10, 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.
Crew
8.6
Overall
8.0
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Crew
8.6
Overall
8.0
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Crew
8.6
Overall
8.0
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Crew
8.6
Overall
8.0
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Crew
8.6
Overall
8.0
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Reviews
1 / 20
8.0
ExcellentLibby,Jun 2026
TUS - LAS
Crew
8.6
Overall
8.0
Entertainment
7.5
Comfort
8.0
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
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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 10, 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% |