$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 5/6. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — STL
Mar 13 — Mar 201
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 October, booked 68 days in advance, depart on a Tuesday or Thursday and return on a Tuesday
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 February 11, 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 February 11, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Wed 4/226:57 pm
SEA
- STL
1 stop22h 15m
Frontier
Mon 4/278:12 pm
STL
- SEA
1 stop15h 15m
Frontier
Deal found 2/10![Frontier logo]()
$147
This Kiwi.com deal was found by Cheapflights users on 2/8. 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.
Wed 4/226:57 pm
SEA
- STL
1 stop22h 15m
Frontier
Fri 5/18:12 pm
STL
- SEA
1 stop15h 15m
Frontier
Deal found 2/8![Frontier logo]()
$154
This American Airlines deal was found by Cheapflights users on 2/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/101:37 pm
SEA
- STL
1 stop8h 07m
American Airlines
Tue 3/176:37 pm
STL
- SEA
1 stop7h 47m
American Airlines
Deal found 2/9![American Airlines logo]()
$159
This Kiwi.com deal was found by Cheapflights users on 2/8. 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.
Sat 4/186:57 pm
SEA
- STL
1 stop22h 15m
Frontier
Fri 5/18:12 pm
STL
- SEA
1 stop15h 15m
Frontier
Deal found 2/8![Frontier logo]()
$161
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Wed 5/136:57 pm
SEA
- STL
1 stop22h 15m
Frontier
Mon 5/188:12 pm
STL
- SEA
1 stop15h 15m
Frontier
Deal found 2/10![Frontier logo]()
$164
This American Airlines deal was found by Cheapflights users on 2/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/512:07 am
SEA
- STL
1 stop7h 56m
American Airlines
Wed 3/116:50 pm
STL
- SEA
1 stop8h 05m
American Airlines
Deal found 2/9![American Airlines logo]()
$168
This Kiwi.com deal was found by Cheapflights users on 2/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/226:57 pm
SEA
- STL
1 stop22h 15m
Frontier
Thu 4/308:12 pm
STL
- SEA
1 stop20h 53m
Frontier
Deal found 2/9![Frontier logo]()
$171
This Delta deal was found by Cheapflights users on 2/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/191:30 pm
SEA
- STL
1 stop8h 55m
Delta
Thu 4/302:20 pm
STL
- SEA
1 stop6h 10m
Delta
Deal found 2/8![Delta logo]()
$177
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Thu 5/76:57 pm
SEA
- STL
1 stop22h 15m
Frontier
Sat 5/98:12 pm
STL
- SEA
1 stop15h 15m
Frontier
Deal found 2/10![Frontier logo]()
$179
This American Airlines deal was found by Cheapflights users on 2/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2712:59 am
SEA
- STL
1 stop8h 38m
American Airlines
Tue 5/55:21 pm
STL
- SEA
1 stop9h 09m
American Airlines
Deal found 2/9![American Airlines logo]()
$184
This Delta deal was found by Cheapflights users on 2/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/209:50 am
SEA
- STL
1 stop5h 36m
Delta
Fri 4/246:45 pm
STL
- SEA
1 stop7h 14m
Delta
Deal found 2/9![Delta logo]()
$187
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 February 11, 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 February 11, 2026.
This Delta deal was found by Cheapflights users on 2/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/191:30 pm
SEA
- STL
1 stop8h 55m
Delta
Thu 4/302:20 pm
STL
- SEA
1 stop6h 10m
Delta
Deal found 2/8![Delta logo]()
$177
This Alaska Airlines deal was found by Cheapflights users on 2/8. 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.
Wed 4/225:57 pm
SEA
- STL
Nonstop4h 02m
Alaska Airlines
Tue 4/287:00 am
STL
- SEA
Nonstop4h 32m
Alaska Airlines
Deal found 2/8![Alaska Airlines logo]()
$197
This Delta deal was found by Cheapflights users on 2/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/261:32 pm
SEA
- STL
1 stop8h 49m
Delta
Mon 3/306:12 pm
STL
- SEA
1 stop7h 51m
Delta
Deal found 2/8![Delta logo]()
$177
This Delta deal was found by Cheapflights users on 2/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/186:00 am
SEA
- STL
1 stop8h 42m
Delta
Tue 4/286:45 pm
STL
- SEA
1 stop7h 14m
Delta
Deal found 2/8![Delta logo]()
$177
This Delta deal was found by Cheapflights users on 2/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/186:00 am
SEA
- STL
1 stop8h 42m
Delta
Fri 5/16:45 pm
STL
- SEA
1 stop7h 14m
Delta
Deal found 2/9![Delta logo]()
$187
This Delta deal was found by Cheapflights users on 2/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/204:36 pm
SEA
- STL
1 stop5h 49m
Delta
Thu 4/302:20 pm
STL
- SEA
1 stop6h 10m
Delta
Deal found 2/9![Delta logo]()
$187
This Delta deal was found by Cheapflights users on 2/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/191:30 pm
SEA
- STL
1 stop8h 55m
Delta
Wed 4/292:20 pm
STL
- SEA
1 stop6h 10m
Delta
Deal found 2/9![Delta logo]()
$187
This Delta deal was found by Cheapflights users on 2/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/215:35 am
SEA
- STL
1 stop5h 48m
Delta
Tue 4/286:45 pm
STL
- SEA
1 stop7h 14m
Delta
Deal found 2/9![Delta logo]()
$187
This Delta deal was found by Cheapflights users on 2/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/216:00 am
SEA
- STL
1 stop8h 50m
Delta
Thu 4/302:20 pm
STL
- SEA
1 stop6h 10m
Delta
Deal found 2/9![Delta logo]()
$187
This Delta deal was found by Cheapflights users on 2/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/174:36 pm
SEA
- STL
1 stop5h 49m
Delta
Sun 4/196:45 pm
STL
- SEA
1 stop7h 14m
Delta
Deal found 2/8![Delta logo]()
$198
This Delta deal was found by Cheapflights users on 2/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/261:32 pm
SEA
- STL
1 stop8h 49m
Delta
Thu 4/22:12 pm
STL
- SEA
1 stop6h 18m
Delta
Deal found 2/8![Delta logo]()
$198
Last-minute flights from Seattle to St. LouisDiscover last-minute flight deals from Seattle to St. Louis. Data last updated February 11, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to St. Louis. Data last updated February 11, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 2/8. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/2411:57 pm
SEA
- STL
1 stop6h 58m
American Airlines
Mon 3/26:36 pm
STL
- SEA
1 stop7h 48m
American Airlines
Deal found 2/8![American Airlines logo]()
$207
This CheapOair deal was found by Cheapflights users on 2/9. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/261:16 pm
SEA
- STL
1 stop21h 53m
Frontier
Mon 3/210:11 pm
STL
- SEA
1 stop22h 07m
Frontier
Deal found 2/9![Frontier logo]()
$190
This CheapOair deal was found by Cheapflights users on 2/9. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/269:23 pm
SEA
- STL
1 stop22h 03m
Frontier
Sat 2/282:51 pm
STL
- SEA
1 stop22h 04m
Frontier
Deal found 2/9![Frontier logo]()
$201
This American Airlines deal was found by Cheapflights users on 2/8. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/210:08 pm
SEA
- STL
1 stop9h 32m
American Airlines
Sat 3/76:36 pm
STL
- SEA
1 stop7h 48m
American Airlines
Deal found 2/8![American Airlines logo]()
$193
This American Airlines deal was found by Cheapflights users on 2/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/512:07 am
SEA
- STL
1 stop7h 56m
American Airlines
Wed 3/116:50 pm
STL
- SEA
1 stop8h 05m
American Airlines
Deal found 2/9![American Airlines logo]()
$168
This American Airlines deal was found by Cheapflights users on 2/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/101:37 pm
SEA
- STL
1 stop8h 07m
American Airlines
Tue 3/176:37 pm
STL
- SEA
1 stop7h 47m
American Airlines
Deal found 2/9![American Airlines logo]()
$159
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Mon 3/169:36 pm
SEA
- STL
1 stop12h 39m
Frontier
Fri 4/38:16 pm
STL
- SEA
1 stop17h 21m
Frontier
Deal found 2/10![Frontier logo]()
$205
This Delta deal was found by Cheapflights users on 2/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/261:32 pm
SEA
- STL
1 stop8h 49m
Delta
Mon 3/306:12 pm
STL
- SEA
1 stop7h 51m
Delta
Deal found 2/8![Delta logo]()
$177
This Kiwi.com deal was found by Cheapflights users on 2/10. 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.
Thu 3/269:35 pm
SEA
- STL
1 stop11h 44m
Frontier
Mon 4/138:16 pm
STL
- SEA
1 stop15h 11m
Frontier
Deal found 2/10![Frontier logo]()
$200
This Kiwi.com deal was found by Cheapflights users on 2/10. 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 3/279:36 pm
SEA
- STL
1 stop11h 43m
Frontier
Mon 4/138:16 pm
STL
- SEA
1 stop15h 11m
Frontier
Deal found 2/10![Frontier logo]()
$204
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 February 11, 2026.
Search for one-way flight options from Seattle to St. Louis. Find affordable one-way fares based on user searches. Data last updated February 11, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/66:57 pm
SEA
- STL
1 stop22h 15m
Frontier
Deal found 2/9![Frontier logo]()
$77
This American Airlines deal was found by Cheapflights users on 2/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/101:37 pm
SEA
- STL
1 stop8h 07m
American Airlines
Deal found 2/9![American Airlines logo]()
$80
This Kiwi.com deal was found by Cheapflights users on 2/11. 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.
Fri 5/86:57 pm
SEA
- STL
1 stop22h 15m
Frontier
Deal found 2/11![Frontier logo]()
$84
This Delta deal was found by Cheapflights users on 2/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/53:30 pm
SEA
- STL
1 stop5h 53m
Delta
Deal found 2/8![Delta logo]()
$89
This Kiwi.com deal was found by Cheapflights users on 2/8. 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.
Mon 3/99:36 pm
SEA
- STL
2 stops34h 13m
Frontier
Deal found 2/8![Frontier logo]()
$91
This Delta deal was found by Cheapflights users on 2/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/1111:59 pm
SEA
- STL
1 stop8h 28m
Delta
Deal found 2/9![Delta logo]()
$94
This Kiwi.com deal was found by Cheapflights users on 2/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/169:35 pm
SEA
- STL
2 stops43h 37m
Frontier
Deal found 2/9![Frontier logo]()
$97
This Alaska Airlines deal was found by Cheapflights users on 2/8. 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 3/77:55 am
SEA
- STL
Nonstop3h 56m
Alaska Airlines
Deal found 2/8![Alaska Airlines logo]()
$99
This Kiwi.com deal was found by Cheapflights users on 2/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/106:57 pm
SEA
- STL
1 stop22h 15m
Frontier
Deal found 2/9![Frontier logo]()
$100
This Expedia deal was found by Cheapflights users on 2/10. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/1010:01 pm
SEA
- STL
1 stop12h 20m
Frontier
Deal found 2/10![Frontier logo]()
$101
This Kiwi.com deal was found by Cheapflights users on 2/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/76:57 pm
SEA
- STL
1 stop22h 15m
Frontier
Deal found 2/9![Frontier logo]()
$102
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 February 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $147 (Kiwi.com) |
One-way from | $77 (Kiwi.com) |
Popular in | December |
Cheapest in | January |
Average price | $339 |
Good round-trip deal | $217 or less |
Good one-way deal | $174 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 February 11, 2026.
Use the filters below to find and compare flights from Seattle to St. Louis that are best for you.
Fly from
Seattle
Fly to
St. Louis
Route
Depart
Return
Price
SeattleSt. Louis
SEA - STL
SEASTL
Seattle/Tacoma Intl
Sun 4/19
1:30 pm-12:25 am
1 stop8h 55m
Lambert-St Louis
Thu 4/30
2:20 pm-6:30 pm
1 stop6h 10m
$177
SeattleSt. Louis
SEA - STL
SEASTL
Seattle/Tacoma Intl
Thu 3/26
1:32 pm-12:21 am
1 stop8h 49m
Lambert-St Louis
Mon 3/30
6:12 pm-12:03 am
1 stop7h 51m
$177
SeattleSt. Louis
SEA - STL
SEASTL
Seattle/Tacoma Intl
Sat 4/18
6:00 am-4:42 pm
1 stop8h 42m
Lambert-St Louis
Tue 4/28
6:45 pm-11:59 pm
1 stop7h 14m
$177
SeattleSt. Louis
SEA - STL
SEASTL
Seattle/Tacoma Intl
Sat 4/18
6:00 am-4:42 pm
1 stop8h 42m
Lambert-St Louis
Fri 5/1
6:45 pm-11:59 pm
1 stop7h 14m
$187
SeattleSt. Louis
SEA - STL
SEASTL
Seattle/Tacoma Intl
Mon 4/20
4:36 pm-12:25 am
1 stop5h 49m
Lambert-St Louis
Thu 4/30
2:20 pm-6:30 pm
1 stop6h 10m
$187
SeattleSt. Louis
SEA - STL
SEASTL
Seattle/Tacoma Intl
Sun 4/19
1:30 pm-12:25 am
1 stop8h 55m
Lambert-St Louis
Wed 4/29
2:20 pm-6:30 pm
1 stop6h 10m
$187
SeattleSt. Louis
SEA - STL
SEASTL
Seattle/Tacoma Intl
Tue 4/21
5:35 am-1:23 pm
1 stop5h 48m
Lambert-St Louis
Tue 4/28
6:45 pm-11:59 pm
1 stop7h 14m
$187
SeattleSt. Louis
SEA - STL
SEASTL
Seattle/Tacoma Intl
Tue 4/21
6:00 am-4:50 pm
1 stop8h 50m
Lambert-St Louis
Thu 4/30
2:20 pm-6:30 pm
1 stop6h 10m
$187
SeattleSt. Louis
SEA - STL
SEASTL
Seattle/Tacoma Intl
Wed 4/22
5:57 pm-11:59 pm
Nonstop4h 02m
Lambert-St Louis
Tue 4/28
7:00 am-9:32 am
Nonstop4h 32m
$197
SeattleSt. Louis
SEA - STL
SEASTL
Seattle/Tacoma Intl
Fri 4/17
4:36 pm-12:25 am
1 stop5h 49m
Lambert-St Louis
Sun 4/19
6:45 pm-11:59 pm
1 stop7h 14m
$198
Showing 1-10 of 20 results
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 February.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy- | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star |
- 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?
Use this chart to determine the optimal time to book a round-trip flight from Seattle to St. Louis. Price data was last updated on February 6, 2026.
The best time to book flights from Seattle to St. Louis is 67 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 $152). Flying from Seattle to St. Louis in December is currently the most expensive (average of $260). 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 February 11, 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 February 11, 2026.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest, and Delta 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.
Comfort
7.8
Overall
8.0
Food
7.1
Boarding
8.1
Crew
8.5
Entertainment
7.0
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Comfort
7.8
Overall
8.0
Food
7.1
Boarding
8.1
Crew
8.5
Entertainment
7.0
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Comfort
7.8
Overall
8.0
Food
7.1
Boarding
8.1
Crew
8.5
Entertainment
7.0
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Comfort
7.8
Overall
8.0
Food
7.1
Boarding
8.1
Crew
8.5
Entertainment
7.0
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Comfort
7.8
Overall
8.0
Food
7.1
Boarding
8.1
Crew
8.5
Entertainment
7.0
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
Comfort
7.8
Overall
8.0
Food
7.1
Boarding
8.1
Crew
8.5
Entertainment
7.0
Reviews
1 / 20
4.0
OkayAnonymous,Dec 2025
SEA - MSY
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
O'Fallon
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
Chesterfield
Alton
Farmington
Festus
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Seattle and St. Louis flights
Browse other Seattle and St. Louis flight options. Last updated on February 11, 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 February 11, 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 February 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$94 | Average$245 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$136 | Average$228 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$157 | Average$303 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$181 | Average$386 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$182 | Average$319 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$188 | Average$488 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$227 | Average$400 | FlexibilityNo cancel fee | On-time75% |