$88+ Cheap flights from Washington to St. Louis (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 6/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — STL
Jun 12 — Jun 191
Round-trip
1 adult, Economy
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Find cheap flights from Washington 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
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Cheapest flights from Washington to St. LouisExplore the most affordable flight options available from Washington to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 13, 2026.
Explore the most affordable flight options available from Washington to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 13, 2026.
This CheapOair deal was found by Cheapflights users on 5/11. 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 8/125:16 pm
PDX
- STL
1 stop24h 07m
Frontier
Wed 8/198:08 pm
STL
- PDX
1 stop22h 49m
Frontier
Deal found 5/11![Frontier logo]()
$220
This Trip.com deal was found by Cheapflights users on 5/10. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/128:42 pm
PDX
- STL
1 stop15h 24m
Frontier
Wed 6/177:46 pm
STL
- PDX
1 stop26h 01m
Frontier
Deal found 5/10![Frontier logo]()
$238
This CheapOair deal was found by Cheapflights users on 5/9. 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 6/118:42 pm
PDX
- STL
1 stop15h 24m
Frontier
Wed 6/177:46 pm
STL
- PDX
1 stop26h 01m
Frontier
Deal found 5/9![Frontier logo]()
$240
This Expedia deal was found by Cheapflights users on 5/10. 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.
Mon 6/811:15 am
PDX
- STL
1 stop27h 50m
Frontier
Mon 6/157:38 pm
STL
- PDX
1 stop22h 57m
Frontier
Deal found 5/10![Frontier logo]()
$250
This CheapOair deal was found by Cheapflights users on 5/10. 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.
Mon 6/111:15 am
PDX
- STL
1 stop6h 56m
Frontier
Fri 6/59:06 pm
STL
- PDX
1 stop15h 14m
Frontier
Deal found 5/10![Frontier logo]()
$254
This Trip.com deal was found by Cheapflights users on 5/12. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/411:15 am
PDX
- STL
1 stop6h 56m
Frontier
Sun 6/79:06 pm
STL
- PDX
1 stop15h 14m
Frontier
Deal found 5/12![Frontier logo]()
$258
This Mytrip deal was found by Cheapflights users on 5/7. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/111:15 am
PDX
- STL
1 stop6h 56m
Frontier
Wed 6/36:51 pm
STL
- PDX
1 stop17h 29m
Frontier
Deal found 5/7![Frontier logo]()
$259
This Booking.com deal was found by Cheapflights users on 5/12. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/312:31 pm
GEG
- STL
1 stop28h 22m
Frontier
Tue 7/78:08 pm
STL
- GEG
1 stop17h 29m
Frontier
Deal found 5/12![Frontier logo]()
$262
This CheapOair deal was found by Cheapflights users on 5/10. 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.
Thu 5/2812:35 pm
PDX
- STL
1 stop28h 48m
Frontier
Sun 5/319:06 pm
STL
- PDX
1 stop15h 14m
Frontier
Deal found 5/10![Frontier logo]()
$270
This CheapOair deal was found by Cheapflights users on 5/10. 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.
Fri 7/246:59 pm
PDX
- STL
1 stop17h 08m
Frontier
Sat 8/12:52 pm
STL
- PDX
1 stop29h 12m
Frontier
Deal found 5/10![Frontier logo]()
$274
This Trip.com deal was found by Cheapflights users on 5/10. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/95:20 pm
PDX
- STL
1 stop24h 03m
Frontier
Tue 6/168:08 pm
STL
- PDX
1 stop22h 27m
Frontier
Deal found 5/10![Frontier logo]()
$277
This Booking.com deal was found by Cheapflights users on 5/7. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/238:12 pm
SEA
- STL
1 stop20h 39m
Frontier
Fri 6/262:56 pm
STL
- SEA
1 stop21h 39m
Frontier
Deal found 5/7![Frontier logo]()
$297
Best flights from Washington to St. LouisDiscover carefully curated flight deals from Washington to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 13, 2026.
Discover carefully curated flight deals from Washington to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 13, 2026.
This Alaska Airlines deal was found by Cheapflights users on 5/7. 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.
Wed 6/312:45 pm
SEA
- STL
Nonstop4h 00m
Alaska Airlines
Sat 6/67:41 pm
STL
- SEA
Nonstop4h 30m
Alaska Airlines
Deal found 5/7![Alaska Airlines logo]()
$317
This Delta deal was found by Cheapflights users on 5/8. 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.
Mon 6/811:15 pm
PDX
- STL
1 stop8h 17m
Delta
Thu 6/117:55 pm
STL
- PDX
1 stop5h 51m
Delta
Deal found 5/8![Delta logo]()
$319
This Southwest deal was found by Cheapflights users on 5/9. 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.
Fri 6/59:00 am
SEA
- STL
Nonstop3h 50m
Southwest
Tue 6/96:55 pm
STL
- SEA
1 stop7h 35m
Southwest
Deal found 5/9![Southwest logo]()
$357
This United Airlines deal was found by Cheapflights users on 5/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/255:07 am
SEA
- STL
1 stop5h 35m
United Airlines
Thu 5/288:43 am
STL
- SEA
2 stops15h 25m
United Airlines
Deal found 5/11![United Airlines logo]()
$441
This Kiwi.com deal was found by Cheapflights users on 5/11. 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.
Wed 6/249:00 am
BLI
- STL
2 stops31h 18m
Multiple Airlines
Sun 6/282:56 pm
STL
- BLI
1 stop20h 05m
Multiple Airlines
Deal found 5/11![Multiple Airlines logo]()
$593
This Alaska Airlines deal was found by Cheapflights users on 5/8. 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 5/305:52 pm
SEA
- STL
Nonstop4h 02m
Alaska Airlines
Sat 6/64:12 pm
STL
- SEA
Nonstop4h 29m
Alaska Airlines
Deal found 5/8![Alaska Airlines logo]()
$317
This Delta deal was found by Cheapflights users on 5/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/1211:15 pm
PDX
- STL
1 stop8h 17m
Delta
Sat 6/205:00 pm
STL
- PDX
1 stop7h 40m
Delta
Deal found 5/11![Delta logo]()
$339
This Southwest deal was found by Cheapflights users on 5/9. 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.
Sat 5/309:00 am
SEA
- STL
2 stops8h 45m
Southwest
Sat 6/66:45 pm
STL
- SEA
1 stop7h 20m
Southwest
Deal found 5/9![Southwest logo]()
$372
This Alaska Airlines deal was found by Cheapflights users on 5/9. 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.
Thu 6/410:37 am
PDX
- STL
Nonstop4h 00m
Alaska Airlines
Mon 6/85:33 pm
STL
- PDX
Nonstop4h 17m
Alaska Airlines
Deal found 5/9![Alaska Airlines logo]()
$348
This Delta deal was found by Cheapflights users on 5/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/287:00 am
GEG
- STL
1 stop7h 46m
Delta
Wed 8/55:42 pm
STL
- GEG
1 stop7h 27m
Delta
Deal found 5/10![Delta logo]()
$363
This Southwest deal was found by Cheapflights users on 5/8. 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 6/115:20 pm
SEA
- STL
1 stop6h 30m
Southwest
Tue 6/1612:10 pm
STL
- SEA
Nonstop4h 15m
Southwest
Deal found 5/8![Southwest logo]()
$383
This United Airlines deal was found by Cheapflights users on 5/7. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/235:00 am
PDX
- STL
1 stop5h 42m
United Airlines
Sat 5/306:00 am
STL
- PDX
2 stops11h 54m
United Airlines
Deal found 5/7![United Airlines logo]()
$467
This Alaska Airlines deal was found by Cheapflights users on 5/8. 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.
Sun 6/710:37 am
PDX
- STL
Nonstop4h 00m
Alaska Airlines
Sun 6/145:37 pm
STL
- PDX
Nonstop4h 10m
Alaska Airlines
Deal found 5/8![Alaska Airlines logo]()
$397
This Southwest deal was found by Cheapflights users on 5/12. 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.
Mon 6/225:20 pm
SEA
- STL
1 stop6h 30m
Southwest
Tue 6/306:10 am
STL
- SEA
2 stops9h 25m
Southwest
Deal found 5/12![Southwest logo]()
$398
This Delta deal was found by Cheapflights users on 5/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/15:10 pm
GEG
- STL
1 stop5h 33m
Delta
Sat 7/116:21 am
STL
- GEG
1 stop7h 18m
Delta
Deal found 5/11![Delta logo]()
$431
This Southwest deal was found by Cheapflights users on 5/12. 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.
Tue 7/216:15 am
SEA
- STL
2 stops10h 10m
Southwest
Sat 7/256:45 pm
STL
- SEA
1 stop7h 20m
Southwest
Deal found 5/12![Southwest logo]()
$402
This Alaska Airlines deal was found by Cheapflights users on 5/7. 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.
Wed 5/2712:46 pm
GEG
- STL
1 stop9h 08m
Alaska Airlines
Sat 5/307:41 pm
STL
- GEG
1 stop6h 18m
Alaska Airlines
Deal found 5/7![Alaska Airlines logo]()
$430
This Delta deal was found by Cheapflights users on 5/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/177:00 am
GEG
- STL
1 stop6h 17m
Delta
Sun 6/215:36 pm
STL
- GEG
1 stop7h 31m
Delta
Deal found 5/10![Delta logo]()
$433
This Southwest deal was found by Cheapflights users on 5/7. 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 8/79:45 am
SEA
- STL
2 stops11h 20m
Southwest
Sun 8/96:10 am
STL
- SEA
1 stop6h 45m
Southwest
Deal found 5/7![Southwest logo]()
$402
This United Airlines deal was found by Cheapflights users on 5/8. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/297:00 am
PSC
- STL
1 stop9h 17m
United Airlines
Sun 5/317:23 pm
STL
- PSC
1 stop7h 23m
United Airlines
Deal found 5/8![United Airlines logo]()
$541
This Alaska Airlines deal was found by Cheapflights users on 5/9. 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.
Thu 5/289:44 am
PDX
- STL
1 stop7h 01m
Alaska Airlines
Sun 5/315:33 pm
STL
- PDX
Nonstop4h 17m
Alaska Airlines
Deal found 5/9![Alaska Airlines logo]()
$453
This Delta deal was found by Cheapflights users on 5/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/510:48 pm
GEG
- STL
1 stop8h 58m
Delta
Sat 7/113:57 pm
STL
- GEG
1 stop5h 28m
Delta
Deal found 5/10![Delta logo]()
$454
This Southwest deal was found by Cheapflights users on 5/9. 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 7/1511:30 pm
PDX
- STL
1 stop7h 40m
Southwest
Sun 7/198:25 am
STL
- PDX
1 stop7h 45m
Southwest
Deal found 5/9![Southwest logo]()
$414
This Delta deal was found by Cheapflights users on 5/9. 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 8/310:56 pm
GEG
- STL
1 stop7h 12m
Delta
Thu 8/65:42 pm
STL
- GEG
1 stop7h 27m
Delta
Deal found 5/9![Delta logo]()
$457
This Southwest deal was found by Cheapflights users on 5/11. 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.
Wed 5/278:50 am
PDX
- STL
2 stops9h 30m
Southwest
Fri 5/291:45 pm
STL
- PDX
1 stop12h 25m
Southwest
Deal found 5/11![Southwest logo]()
$419
This Alaska Airlines deal was found by Cheapflights users on 5/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/15:00 am
ALW
- STL
1 stop7h 04m
Alaska Airlines
Sat 9/56:00 am
STL
- ALW
1 stop9h 09m
Alaska Airlines
Deal found 5/11![Alaska Airlines logo]()
$465
This Delta deal was found by Cheapflights users on 5/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/125:21 pm
PSC
- STL
1 stop5h 22m
Delta
Mon 6/157:55 pm
STL
- PSC
1 stop6h 03m
Delta
Deal found 5/10![Delta logo]()
$457
This Southwest deal was found by Cheapflights users on 5/7. 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.
Thu 7/303:15 pm
PDX
- STL
1 stop7h 20m
Southwest
Mon 8/33:20 pm
STL
- PDX
2 stops8h 50m
Southwest
Deal found 5/7![Southwest logo]()
$419
This Alaska Airlines deal was found by Cheapflights users on 5/10. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/1210:59 pm
PDX
- STL
1 stop7h 42m
Alaska Airlines
Sat 6/205:37 pm
STL
- PDX
Nonstop4h 10m
Alaska Airlines
Deal found 5/10![Alaska Airlines logo]()
$468
This Southwest deal was found by Cheapflights users on 5/8. 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.
Wed 5/2710:55 am
GEG
- STL
2 stops9h 05m
Southwest
Wed 6/106:55 pm
STL
- GEG
1 stop6h 50m
Southwest
Deal found 5/8![Southwest logo]()
$425
Last-minute flights from Washington to St. LouisDiscover last-minute flight deals from Washington to St. Louis. Data last updated May 13, 2026 and is based on user searches.
Discover last-minute flight deals from Washington to St. Louis. Data last updated May 13, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 5/9. 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.
Mon 5/258:20 pm
SEA
- STL
1 stop19h 46m
Frontier
Fri 5/298:08 pm
STL
- SEA
1 stop15h 58m
Frontier
Deal found 5/9![Frontier logo]()
$300
This CheapOair deal was found by Cheapflights users on 5/10. 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.
Thu 5/2812:35 pm
PDX
- STL
1 stop28h 48m
Frontier
Sun 5/319:06 pm
STL
- PDX
1 stop15h 14m
Frontier
Deal found 5/10![Frontier logo]()
$270
This CheapOair deal was found by Cheapflights users on 5/11. 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.
Sat 5/3012:35 pm
PDX
- STL
1 stop28h 48m
Frontier
Thu 6/49:06 pm
STL
- PDX
1 stop15h 14m
Frontier
Deal found 5/11![Frontier logo]()
$290
This CheapOair deal was found by Cheapflights users on 5/10. 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.
Mon 6/111:15 am
PDX
- STL
1 stop6h 56m
Frontier
Fri 6/59:06 pm
STL
- PDX
1 stop15h 14m
Frontier
Deal found 5/10![Frontier logo]()
$254
This Mytrip deal was found by Cheapflights users on 5/7. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/111:15 am
PDX
- STL
1 stop6h 56m
Frontier
Wed 6/36:51 pm
STL
- PDX
1 stop17h 29m
Frontier
Deal found 5/7![Frontier logo]()
$259
This Mytrip deal was found by Cheapflights users on 5/7. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/25:46 pm
PDX
- STL
1 stop23h 37m
Frontier
Thu 6/49:06 pm
STL
- PDX
1 stop15h 14m
Frontier
Deal found 5/7![Frontier logo]()
$281
This Trip.com deal was found by Cheapflights users on 5/12. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/411:15 am
PDX
- STL
1 stop6h 56m
Frontier
Sun 6/79:06 pm
STL
- PDX
1 stop15h 14m
Frontier
Deal found 5/12![Frontier logo]()
$258
This Expedia deal was found by Cheapflights users on 5/10. 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.
Mon 6/811:15 am
PDX
- STL
1 stop27h 50m
Frontier
Mon 6/157:38 pm
STL
- PDX
1 stop22h 57m
Frontier
Deal found 5/10![Frontier logo]()
$250
This Trip.com deal was found by Cheapflights users on 5/10. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/95:20 pm
PDX
- STL
1 stop24h 03m
Frontier
Tue 6/168:08 pm
STL
- PDX
1 stop22h 27m
Frontier
Deal found 5/10![Frontier logo]()
$277
This CheapOair deal was found by Cheapflights users on 5/9. 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 6/118:42 pm
PDX
- STL
1 stop15h 24m
Frontier
Wed 6/177:46 pm
STL
- PDX
1 stop26h 01m
Frontier
Deal found 5/9![Frontier logo]()
$240
This Trip.com deal was found by Cheapflights users on 5/10. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/128:42 pm
PDX
- STL
1 stop15h 24m
Frontier
Wed 6/177:46 pm
STL
- PDX
1 stop26h 01m
Frontier
Deal found 5/10![Frontier logo]()
$238
This Booking.com deal was found by Cheapflights users on 5/7. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/238:12 pm
SEA
- STL
1 stop20h 39m
Frontier
Fri 6/262:56 pm
STL
- SEA
1 stop21h 39m
Frontier
Deal found 5/7![Frontier logo]()
$297
One-way flights from Washington to St. LouisSearch for one-way flight options from Washington to St. Louis. Find affordable one-way fares based on user searches. Data last updated May 13, 2026.
Search for one-way flight options from Washington to St. Louis. Find affordable one-way fares based on user searches. Data last updated May 13, 2026.
This Kiwi.com deal was found by Cheapflights users on 5/7. 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.
Mon 6/17:50 pm
SEA
- STL
1 stop21h 33m
Frontier
Deal found 5/7![Frontier logo]()
$88
This Kiwi.com deal was found by Cheapflights users on 5/10. 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.
Tue 6/25:46 pm
PDX
- STL
1 stop23h 37m
Frontier
Deal found 5/10![Frontier logo]()
$100
This Trip.com deal was found by Cheapflights users on 5/12. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/87:50 pm
SEA
- STL
1 stop21h 33m
Frontier
Deal found 5/12![Frontier logo]()
$103
This Super.com deal was found by Cheapflights users on 5/12. 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 6/108:12 pm
SEA
- STL
1 stop15h 54m
Frontier
Deal found 5/12![Frontier logo]()
$108
This Trip.com deal was found by Cheapflights users on 5/7. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/37:50 pm
SEA
- STL
1 stop21h 33m
Frontier
Deal found 5/7![Frontier logo]()
$109
This Super.com deal was found by Cheapflights users on 5/12. 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.
Tue 6/98:12 pm
SEA
- STL
1 stop19h 56m
Frontier
Deal found 5/12![Frontier logo]()
$110
This Kiwi.com deal was found by Cheapflights users on 5/12. 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.
Mon 6/112:35 pm
PDX
- STL
1 stop28h 48m
Frontier
Deal found 5/12![Frontier logo]()
$111
This Kiwi.com deal was found by Cheapflights users on 5/12. 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.
Tue 10/135:35 pm
PDX
- STL
1 stop23h 40m
Frontier
Deal found 5/12![Frontier logo]()
$112
This Kiwi.com deal was found by Cheapflights users on 5/11. 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 6/42:38 pm
PDX
- STL
2 stops40h 17m
Multiple Airlines
Deal found 5/11![Multiple Airlines logo]()
$114
This Mytrip deal was found by Cheapflights users on 5/7. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/1712:31 pm
GEG
- STL
1 stop28h 22m
Frontier
Deal found 5/7![Frontier logo]()
$115
This Mytrip deal was found by Cheapflights users on 5/7. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/297:41 pm
SEA
- STL
1 stop21h 42m
Frontier
Deal found 5/7![Frontier logo]()
$115
This Booking.com deal was found by Cheapflights users on 5/11. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/1012:31 pm
GEG
- STL
1 stop28h 22m
Frontier
Deal found 5/11![Frontier logo]()
$116
Find flight deals from Washington to St. Louis
Keep the following information in mind while searching for Washington to St. Louis flight deals. Data was last updated May 13, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $220 (CheapOair) |
One-way from | $88 (Kiwi.com) |
Popular in | December |
Cheapest in | January |
Average price | $432 |
Good round-trip deal | $393 or less |
Good one-way deal | $233 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Washington 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 May 13, 2026.
Use the filters below to find and compare flights from Washington to St. Louis that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
SeattleSt. Louis
SEA - STL
SEASTL
Seattle/Tacoma Intl
Wed 6/3
12:45 pm-6:45 pm
Nonstop4h 00m
Lambert-St Louis
Sat 6/6
7:41 pm-10:11 pm
Nonstop4h 30m
$317
SeattleSt. Louis
SEA - STL
SEASTL
Seattle/Tacoma Intl
Sat 5/30
5:52 pm-11:54 pm
Nonstop4h 02m
Lambert-St Louis
Sat 6/6
4:12 pm-6:41 pm
Nonstop4h 29m
$317
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Mon 6/8
11:15 pm-9:32 am
1 stop8h 17m
Lambert-St Louis
Thu 6/11
7:55 pm-11:46 pm
1 stop5h 51m
$319
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Fri 6/12
11:15 pm-9:32 am
1 stop8h 17m
Lambert-St Louis
Sat 6/20
5:00 pm-10:40 pm
1 stop7h 40m
$339
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Thu 6/4
10:37 am-4:37 pm
Nonstop4h 00m
Lambert-St Louis
Mon 6/8
5:33 pm-7:50 pm
Nonstop4h 17m
$348
SeattleSt. Louis
SEA - STL
SEASTL
Seattle/Tacoma Intl
Fri 6/5
9:00 am-2:50 pm
Nonstop3h 50m
Lambert-St Louis
Tue 6/9
6:55 pm-12:30 am
1 stop7h 35m
$357
SpokaneSt. Louis
GEG - STL
GEGSTL
Spokane
Tue 7/28
7:00 am-4:46 pm
1 stop7h 46m
Lambert-St Louis
Wed 8/5
5:42 pm-11:09 pm
1 stop7h 27m
$363
SeattleSt. Louis
SEA - STL
SEASTL
Seattle/Tacoma Intl
Sat 5/30
9:00 am-7:45 pm
2 stops8h 45m
Lambert-St Louis
Sat 6/6
6:45 pm-12:05 am
1 stop7h 20m
$372
SeattleSt. Louis
SEA - STL
SEASTL
Seattle/Tacoma Intl
Thu 6/11
5:20 pm-1:50 am
1 stop6h 30m
Lambert-St Louis
Tue 6/16
12:10 pm-2:25 pm
Nonstop4h 15m
$383
Quickest round-trip
PortlandSt. Louis
PDX - STL
PDXSTL
Portland
Sun 6/7
10:37 am-4:37 pm
Nonstop4h 00m
Lambert-St Louis
Sun 6/14
5:37 pm-7:47 pm
Nonstop4h 10m
$397
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Washington to St. Louis
Have a flexible travel schedule? Discover the best time to fly to St. Louis from Washington with our price prediction graph.
SEA-STL
PDX-STL
BLI-STL
GEG-STL
PSC-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 Washington to St. Louis
USWA-STL
SEA-STL
PDX-STL
BLI-STL
GEG-STL
How far ahead should I book a flight from State of Washington to St. Louis?
Booking 76 days in advance of your planned departure date is, on average, the best time to get cheap flights from State of Washington to St. Louis. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
What is the cheapest month to book a flight from State of Washington to St. Louis?
Currently, January is the cheapest month in which you can book a flight from State of Washington to St. Louis (average of $88). Flying from State of Washington to St. Louis in December is currently the most expensive (average of $176). 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 WA to STL?
Find hourly flight availability from Washington 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 May 13, 2026.
When flying from State of Washington 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.
Weekly flight availability from State of Washington to St. Louis
Explore weekly flight availability from Washington to St. Louis. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated May 13, 2026.
The most flights from USWA to STL are scheduled on a Wednesday (8 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (3 on average).
How much does it cost to fly round-trip from State of Washington to St. Louis?
Related info for your journey
Find useful and relevant information for your journey from Washington 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
Fenton
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Wentzville
Glencoe
Chesterfield
Alton
Farmington
Festus
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Alternative routes for Washington to St. Louis
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to St. Louis by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Washington to St. Louis by cabin class
Find flights from Washington to St. Louis, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Washington and St. Louis flights
Browse other Washington and St. Louis flight options. Last updated on May 13, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to St. Louis
Explore flights to St. Louis departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on May 13, 2026.
Washington to St. Louis flights
Consider these flights traveling from Washington to St. Louis.
Top 7 airlines flying from Washington to St. Louis
Discover the top 7 airlines that operate flights from Washington 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 May 13, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$94 | Average$399 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$136 | Average$218 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$157 | Average$385 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$182 | Average$428 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$188 | Average$564 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$217 | Average$384 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$226 | Average$424 | FlexibilityNo cancel fee | On-time75% |