$80+ Cheap flights from St. Louis (STL) to Washington
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 6/9. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SEA
apr. 27 — maj 41
Round-trip
1 adult, Economy
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Cheapest flights from St. Louis to WashingtonExplore the most affordable flight options available from St. Louis to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on marts 28, 2026.
Explore the most affordable flight options available from St. Louis to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on marts 28, 2026.
This Southwest deal was found by Cheapflights users on 3/24. 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.
ons. 4/151:45 pm
STL
- SEA
1 stop12h 25m
Southwest
lør. 4/185:45 am
SEA
- STL
2 stops10h 25m
Southwest
Deal found 3/24![Southwest logo]()
$195
This CheapOair deal was found by Cheapflights users on 3/23. 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.
man. 4/208:17 pm
STL
- SEA
1 stop15h 10m
Frontier
ons. 4/297:12 pm
SEA
- STL
1 stop22h 09m
Frontier
Deal found 3/23![Frontier logo]()
$196
This Southwest deal was found by Cheapflights users on 3/26. 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.
fre. 5/17:20 pm
STL
- SEA
1 stop7h 20m
Southwest
tir. 5/56:00 am
SEA
- STL
1 stop7h 05m
Southwest
Deal found 3/26![Southwest logo]()
$199
This Southwest deal was found by Cheapflights users on 3/23. 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.
ons. 5/65:30 am
STL
- SEA
2 stops14h 30m
Southwest
lør. 5/95:45 am
SEA
- STL
2 stops10h 25m
Southwest
Deal found 3/23![Southwest logo]()
$200
This Delta deal was found by Cheapflights users on 3/25. 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.
tir. 4/212:20 pm
STL
- SEA
1 stop6h 10m
Delta
fre. 5/111:14 pm
SEA
- STL
1 stop8h 34m
Delta
Deal found 3/25![Delta logo]()
$203
This Delta deal was found by Cheapflights users on 3/26. 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.
tir. 4/286:45 pm
STL
- PDX
1 stop7h 08m
Delta
tir. 5/121:40 pm
PDX
- STL
1 stop8h 50m
Delta
Deal found 3/26![Delta logo]()
$205
This Southwest deal was found by Cheapflights users on 3/24. 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.
tir. 4/141:45 pm
STL
- PDX
2 stops9h 00m
Southwest
tir. 4/2111:55 pm
PDX
- STL
1 stop7h 35m
Southwest
Deal found 3/24![Southwest logo]()
$206
This American Airlines deal was found by Cheapflights users on 3/24. 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.
man. 4/205:21 pm
STL
- SEA
1 stop9h 15m
American Airlines
tir. 4/283:17 pm
SEA
- STL
1 stop6h 29m
American Airlines
Deal found 3/24![American Airlines logo]()
$209
This Southwest deal was found by Cheapflights users on 3/26. 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.
tor. 4/235:45 am
STL
- SEA
2 stops13h 15m
Southwest
tor. 4/3011:55 pm
SEA
- STL
1 stop8h 20m
Southwest
Deal found 3/26![Southwest logo]()
$210
This Kiwi.com deal was found by Cheapflights users on 3/25. 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.
man. 4/208:17 pm
STL
- SEA
1 stop15h 10m
Frontier
fre. 5/17:12 pm
SEA
- STL
1 stop22h 20m
Frontier
Deal found 3/25![Frontier logo]()
$212
This Delta deal was found by Cheapflights users on 3/25. 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.
ons. 4/226:45 pm
STL
- SEA
1 stop7h 14m
Delta
søn. 4/261:30 pm
SEA
- STL
1 stop8h 55m
Delta
Deal found 3/25![Delta logo]()
$213
This Delta deal was found by Cheapflights users on 3/25. 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.
tor. 4/236:45 pm
STL
- SEA
1 stop7h 14m
Delta
fre. 5/11:30 pm
SEA
- STL
1 stop8h 55m
Delta
Deal found 3/25![Delta logo]()
$214
Best flights from St. Louis to WashingtonDiscover carefully curated flight deals from St. Louis to Washington that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated marts 28, 2026.
Discover carefully curated flight deals from St. Louis to Washington that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated marts 28, 2026.
This Delta deal was found by Cheapflights users on 3/27. 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.
fre. 5/15:35 pm
STL
- SEA
1 stop8h 19m
Delta
man. 5/1111:59 pm
SEA
- STL
1 stop6h 47m
Delta
Deal found 3/27![Delta logo]()
$224
This Southwest deal was found by Cheapflights users on 3/26. 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.
tor. 5/211:45 pm
STL
- PDX
1 stop12h 25m
Southwest
tir. 5/2611:55 pm
PDX
- STL
1 stop7h 35m
Southwest
Deal found 3/26![Southwest logo]()
$262
This United Airlines deal was found by Cheapflights users on 3/23. 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.
ons. 5/275:10 am
STL
- PDX
1 stop6h 37m
United Airlines
søn. 5/3111:40 pm
PDX
- STL
1 stop7h 01m
United Airlines
Deal found 3/23![United Airlines logo]()
$298
This Alaska Airlines deal was found by Cheapflights users on 3/28. 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.
ons. 8/55:33 pm
STL
- PDX
Nonstop4h 10m
Alaska Airlines
fre. 8/1410:45 am
PDX
- STL
Nonstop3h 48m
Alaska Airlines
Deal found 3/28![Alaska Airlines logo]()
$358
This Delta deal was found by Cheapflights users on 3/28. 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.
ons. 5/137:59 pm
STL
- PDX
1 stop5h 45m
Delta
fre. 5/153:10 pm
PDX
- STL
1 stop6h 11m
Delta
Deal found 3/28![Delta logo]()
$293
This United Airlines deal was found by Cheapflights users on 3/25. 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.
ons. 5/65:59 pm
STL
- PDX
1 stop6h 55m
United Airlines
lør. 5/97:45 pm
PDX
- STL
2 stops10h 54m
United Airlines
Deal found 3/25![United Airlines logo]()
$329
This Southwest deal was found by Cheapflights users on 3/24. 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.
fre. 6/267:45 pm
STL
- SEA
1 stop7h 05m
Southwest
lør. 7/410:45 pm
SEA
- STL
1 stop7h 00m
Southwest
Deal found 3/24![Southwest logo]()
$349
This Delta deal was found by Cheapflights users on 3/28. 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.
søn. 5/107:59 pm
STL
- PDX
1 stop5h 45m
Delta
tir. 5/1211:12 pm
PDX
- STL
1 stop8h 17m
Delta
Deal found 3/28![Delta logo]()
$318
This Southwest deal was found by Cheapflights users on 3/23. 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.
tor. 5/75:45 am
STL
- SEA
2 stops13h 15m
Southwest
man. 5/1111:40 am
SEA
- STL
2 stops8h 25m
Southwest
Deal found 3/23![Southwest logo]()
$350
This Alaska Airlines deal was found by Cheapflights users on 3/27. 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.
søn. 5/245:33 pm
STL
- PDX
Nonstop4h 17m
Alaska Airlines
man. 6/110:37 am
PDX
- STL
Nonstop4h 00m
Alaska Airlines
Deal found 3/27![Alaska Airlines logo]()
$387
This United Airlines deal was found by Cheapflights users on 3/23. 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.
lør. 5/97:45 am
STL
- PDX
2 stops11h 59m
United Airlines
lør. 5/2311:05 am
PDX
- STL
2 stops9h 39m
United Airlines
Deal found 3/23![United Airlines logo]()
$353
This Delta deal was found by Cheapflights users on 3/23. 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.
tor. 5/287:59 pm
STL
- SEA
1 stop6h 13m
Delta
man. 6/111:59 pm
SEA
- STL
1 stop6h 47m
Delta
Deal found 3/23![Delta logo]()
$329
This Southwest deal was found by Cheapflights users on 3/28. 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.
fre. 9/116:15 pm
STL
- SEA
1 stop7h 15m
Southwest
søn. 9/1311:35 am
SEA
- STL
1 stop9h 30m
Southwest
Deal found 3/28![Southwest logo]()
$363
This Alaska Airlines deal was found by Cheapflights users on 3/28. 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.
tir. 5/199:34 am
STL
- SEA
2 stops12h 54m
Alaska Airlines
tor. 6/410:58 pm
SEA
- STL
1 stop7h 53m
Alaska Airlines
Deal found 3/28![Alaska Airlines logo]()
$403
This Delta deal was found by Cheapflights users on 3/28. 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.
søn. 5/107:59 pm
STL
- PDX
1 stop5h 45m
Delta
man. 5/115:05 pm
PDX
- STL
1 stop5h 25m
Delta
Deal found 3/28![Delta logo]()
$334
This United Airlines deal was found by Cheapflights users on 3/23. 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.
lør. 5/94:15 pm
STL
- GEG
1 stop7h 01m
United Airlines
ons. 5/135:00 am
GEG
- STL
1 stop6h 13m
United Airlines
Deal found 3/23![United Airlines logo]()
$395
This Southwest deal was found by Cheapflights users on 3/24. 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.
ons. 4/221:45 pm
STL
- PDX
2 stops9h 00m
Southwest
ons. 4/297:00 am
PDX
- STL
2 stops9h 00m
Southwest
Deal found 3/24![Southwest logo]()
$365
This United Airlines deal was found by Cheapflights users on 3/23. 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.
fre. 7/37:23 pm
STL
- SEA
1 stop7h 57m
United Airlines
fre. 7/1011:49 pm
SEA
- STL
1 stop8h 18m
United Airlines
Deal found 3/23![United Airlines logo]()
$399
This Southwest deal was found by Cheapflights users on 3/24. 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.
tir. 6/25:30 am
STL
- SEA
2 stops14h 30m
Southwest
tir. 6/96:15 am
SEA
- STL
2 stops10h 10m
Southwest
Deal found 3/24![Southwest logo]()
$365
This Delta deal was found by Cheapflights users on 3/26. 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.
man. 5/117:59 pm
STL
- GEG
1 stop5h 36m
Delta
man. 5/187:23 pm
GEG
- STL
2 stops11h 23m
Delta
Deal found 3/26![Delta logo]()
$385
This Alaska Airlines deal was found by Cheapflights users on 3/27. 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.
tor. 4/304:46 pm
STL
- GEG
2 stops17h 54m
Alaska Airlines
lør. 5/22:45 pm
GEG
- STL
1 stop7h 14m
Alaska Airlines
Deal found 3/27![Alaska Airlines logo]()
$471
This Southwest deal was found by Cheapflights users on 3/26. 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.
fre. 6/53:20 pm
STL
- PDX
2 stops8h 45m
Southwest
man. 6/89:20 pm
PDX
- STL
1 stop8h 25m
Southwest
Deal found 3/26![Southwest logo]()
$367
This United Airlines deal was found by Cheapflights users on 3/25. 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.
fre. 8/141:36 pm
STL
- SEA
2 stops11h 48m
United Airlines
lør. 8/2211:56 pm
SEA
- STL
1 stop8h 13m
United Airlines
Deal found 3/25![United Airlines logo]()
$404
This Alaska Airlines deal was found by Cheapflights users on 3/24. 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.
ons. 5/64:46 pm
STL
- PSC
2 stops31h 26m
Alaska Airlines
lør. 5/91:21 pm
PSC
- STL
1 stop8h 38m
Alaska Airlines
Deal found 3/24![Alaska Airlines logo]()
$475
This Southwest deal was found by Cheapflights users on 3/23. 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.
søn. 6/77:35 pm
STL
- SEA
1 stop7h 35m
Southwest
ons. 6/179:30 am
SEA
- STL
Nonstop3h 50m
Southwest
Deal found 3/23![Southwest logo]()
$374
This Delta deal was found by Cheapflights users on 3/26. 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.
ons. 4/157:25 am
STL
- PSC
2 stops11h 44m
Delta
lør. 4/1812:16 pm
PSC
- STL
1 stop7h 15m
Delta
Deal found 3/26![Delta logo]()
$414
This United Airlines deal was found by Cheapflights users on 3/23. 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.
ons. 5/62:35 pm
STL
- PSC
1 stop8h 18m
United Airlines
lør. 5/95:00 am
PSC
- STL
1 stop7h 28m
United Airlines
Deal found 3/23![United Airlines logo]()
$417
This Alaska Airlines deal was found by Cheapflights users on 3/26. 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.
tor. 5/287:41 pm
STL
- PSC
1 stop6h 33m
Alaska Airlines
søn. 5/317:17 pm
PSC
- STL
1 stop17h 59m
Alaska Airlines
Deal found 3/26![Alaska Airlines logo]()
$485
This Southwest deal was found by Cheapflights users on 3/28. 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.
man. 5/115:45 am
STL
- PDX
2 stops12h 35m
Southwest
tir. 5/127:00 am
PDX
- STL
2 stops9h 00m
Southwest
Deal found 3/28![Southwest logo]()
$375
This Delta deal was found by Cheapflights users on 3/25. 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.
fre. 5/157:59 pm
STL
- GEG
1 stop5h 36m
Delta
man. 5/187:23 pm
GEG
- STL
2 stops13h 09m
Delta
Deal found 3/25![Delta logo]()
$415
Last-minute flights from St. Louis to WashingtonDiscover last-minute flight deals from St. Louis to Washington. Data last updated marts 28, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Washington. Data last updated marts 28, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 3/27. 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.
lør. 4/41:06 pm
STL
- SEA
1 stop7h 45m
Frontier
tor. 4/99:35 pm
SEA
- STL
1 stop11h 52m
Frontier
Deal found 3/27![Frontier logo]()
$251
This Delta deal was found by Cheapflights users on 3/23. 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.
man. 4/136:45 pm
STL
- PDX
1 stop7h 08m
Delta
man. 4/2711:15 pm
PDX
- STL
1 stop8h 27m
Delta
Deal found 3/23![Delta logo]()
$243
This Southwest deal was found by Cheapflights users on 3/24. 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.
tir. 4/141:45 pm
STL
- PDX
2 stops9h 00m
Southwest
tir. 4/2111:55 pm
PDX
- STL
1 stop7h 35m
Southwest
Deal found 3/24![Southwest logo]()
$206
This Delta deal was found by Cheapflights users on 3/25. 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.
tir. 4/142:20 pm
STL
- PDX
1 stop5h 48m
Delta
tir. 4/2111:15 pm
PDX
- STL
1 stop8h 27m
Delta
Deal found 3/25![Delta logo]()
$225
This CheapOair deal was found by Cheapflights users on 3/24. 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.
fre. 4/178:06 pm
STL
- PDX
1 stop17h 36m
Frontier
man. 4/2011:48 am
PDX
- STL
1 stop5h 44m
Frontier
Deal found 3/24![Frontier logo]()
$216
This Southwest deal was found by Cheapflights users on 3/26. 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.
tor. 4/231:45 pm
STL
- PDX
1 stop12h 25m
Southwest
tor. 4/303:00 pm
PDX
- STL
1 stop7h 15m
Southwest
Deal found 3/26![Southwest logo]()
$250
This Kiwi.com deal was found by Cheapflights users on 3/26. 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.
lør. 4/258:17 pm
STL
- PDX
1 stop16h 03m
Frontier
lør. 5/212:27 pm
PDX
- STL
1 stop28h 54m
Frontier
Deal found 3/26![Frontier logo]()
$240
This Delta deal was found by Cheapflights users on 3/26. 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.
man. 4/276:45 pm
STL
- PDX
1 stop7h 08m
Delta
ons. 5/131:40 pm
PDX
- STL
1 stop8h 50m
Delta
Deal found 3/26![Delta logo]()
$244
This Delta deal was found by Cheapflights users on 3/26. 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.
tir. 4/286:45 pm
STL
- PDX
1 stop7h 08m
Delta
ons. 5/131:40 pm
PDX
- STL
1 stop8h 50m
Delta
Deal found 3/26![Delta logo]()
$205
This Delta deal was found by Cheapflights users on 3/26. 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.
tir. 4/286:45 pm
STL
- PDX
1 stop7h 08m
Delta
lør. 5/165:45 am
PDX
- STL
1 stop5h 47m
Delta
Deal found 3/26![Delta logo]()
$224
This Southwest deal was found by Cheapflights users on 3/26. 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.
tir. 4/281:45 pm
STL
- PDX
2 stops9h 00m
Southwest
fre. 5/1511:55 pm
PDX
- STL
1 stop8h 35m
Southwest
Deal found 3/26![Southwest logo]()
$245
This Southwest deal was found by Cheapflights users on 3/24. 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.
ons. 4/295:30 am
STL
- PDX
2 stops10h 20m
Southwest
tor. 4/303:00 pm
PDX
- STL
1 stop7h 15m
Southwest
Deal found 3/24![Southwest logo]()
$238
One-way flights from St. Louis to WashingtonSearch for one-way flight options from St. Louis to Washington. Find affordable one-way fares based on user searches. Data last updated marts 28, 2026.
Search for one-way flight options from St. Louis to Washington. Find affordable one-way fares based on user searches. Data last updated marts 28, 2026.
This Southwest deal was found by Cheapflights users on 3/24. 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.
tir. 6/95:50 am
STL
- SEA
1 stop6h 30m
Southwest
Deal found 3/24![Southwest logo]()
$80
This American Airlines deal was found by Cheapflights users on 3/24. 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.
tir. 4/215:21 pm
STL
- SEA
1 stop9h 15m
American Airlines
Deal found 3/24![American Airlines logo]()
$85
This Frontier deal was found by Cheapflights users on 3/25. 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.
tor. 4/239:55 pm
STL
- PDX
1 stop13h 04m
Frontier
Deal found 3/25![Frontier logo]()
$86
This Kiwi.com deal was found by Cheapflights users on 3/24. 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.
man. 4/138:19 pm
STL
- SEA
1 stop15h 08m
Frontier
Deal found 3/24![Frontier logo]()
$86
This Kiwi.com deal was found by Cheapflights users on 3/24. 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.
man. 4/138:19 pm
STL
- PDX
1 stop18h 43m
Frontier
Deal found 3/24![Frontier logo]()
$88
This Delta deal was found by Cheapflights users on 3/25. 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.
ons. 4/226:45 pm
STL
- SEA
1 stop7h 14m
Delta
Deal found 3/25![Delta logo]()
$89
This Southwest deal was found by Cheapflights users on 3/25. 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.
ons. 5/66:35 am
STL
- SEA
2 stops13h 55m
Southwest
Deal found 3/25![Southwest logo]()
$90
This CheapOair deal was found by Cheapflights users on 3/28. 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.
man. 4/278:17 pm
STL
- PDX
1 stop17h 35m
Frontier
Deal found 3/28![Frontier logo]()
$92
This CheapOair deal was found by Cheapflights users on 3/24. 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.
tor. 4/239:55 pm
STL
- SEA
1 stop25h 01m
Frontier
Deal found 3/24![Frontier logo]()
$92
This Kiwi.com deal was found by Cheapflights users on 3/25. 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.
tir. 5/268:08 pm
STL
- SEA
1 stop15h 58m
Frontier
Deal found 3/25![Frontier logo]()
$95
This Southwest deal was found by Cheapflights users on 3/26. 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.
tir. 4/285:30 am
STL
- SEA
2 stops14h 30m
Southwest
Deal found 3/26![Southwest logo]()
$96
This United Airlines deal was found by Cheapflights users on 3/24. 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.
ons. 5/135:59 pm
STL
- PDX
1 stop6h 55m
United Airlines
Deal found 3/24![United Airlines logo]()
$98
Find flight deals from St. Louis to Washington
Keep the following information in mind while searching for St. Louis to Washington flight deals. Data was last updated marts 28, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $195 (Southwest) |
One-way from | $80 (Southwest) |
Popular in | July |
Cheapest in | February |
Average price | $298 |
Good round-trip deal | $360 or less |
Good one-way deal | $203 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Washington 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 marts 28, 2026.
Use the filters below to find and compare flights from St. Louis to Washington that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisSeattle
STL - SEA
STLSEA
Lambert-St Louis
fre. 5/1
5:35 pm-11:54 pm
1 stop8h 19m
Seattle/Tacoma Intl
man. 5/11
11:59 pm-8:46 am
1 stop6h 47m
$224
St. LouisPortland
STL - PDX
STLPDX
Lambert-St Louis
tor. 5/21
1:45 pm-12:10 am
1 stop12h 25m
Portland
tir. 5/26
11:55 pm-9:30 am
1 stop7h 35m
$262
St. LouisPortland
STL - PDX
STLPDX
Lambert-St Louis
ons. 5/13
7:59 pm-11:44 pm
1 stop5h 45m
Portland
fre. 5/15
3:10 pm-11:21 pm
1 stop6h 11m
$293
St. LouisPortland
STL - PDX
STLPDX
Lambert-St Louis
ons. 5/27
5:10 am-9:47 am
1 stop6h 37m
Portland
søn. 5/31
11:40 pm-8:41 am
1 stop7h 01m
$298
St. LouisPortland
STL - PDX
STLPDX
Lambert-St Louis
søn. 5/10
7:59 pm-11:44 pm
1 stop5h 45m
Portland
tir. 5/12
11:12 pm-9:29 am
1 stop8h 17m
$318
St. LouisPortland
STL - PDX
STLPDX
Lambert-St Louis
ons. 5/6
5:59 pm-10:54 pm
1 stop6h 55m
Portland
lør. 5/9
7:45 pm-8:39 am
2 stops10h 54m
$329
St. LouisSeattle
STL - SEA
STLSEA
Lambert-St Louis
tor. 5/28
7:59 pm-12:12 am
1 stop6h 13m
Seattle/Tacoma Intl
man. 6/1
11:59 pm-8:46 am
1 stop6h 47m
$329
St. LouisPortland
STL - PDX
STLPDX
Lambert-St Louis
søn. 5/10
7:59 pm-11:44 pm
1 stop5h 45m
Portland
man. 5/11
5:05 pm-12:30 am
1 stop5h 25m
$334
St. LouisSeattle
STL - SEA
STLSEA
Lambert-St Louis
fre. 6/26
7:45 pm-12:50 am
1 stop7h 05m
Seattle/Tacoma Intl
lør. 7/4
10:45 pm-7:45 am
1 stop7h 00m
$349
St. LouisSeattle
STL - SEA
STLSEA
Lambert-St Louis
tor. 5/7
5:45 am-5:00 pm
2 stops13h 15m
Seattle/Tacoma Intl
man. 5/11
11:40 am-10:05 pm
2 stops8h 25m
$350
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from St. Louis to Washington
Have a flexible travel schedule? Discover the best time to fly to Washington from St. Louis with our price prediction graph.
STL-PDX
STL-SEA
STL-GEG
STL-PSC
STL-YKM
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 St. Louis to Washington
STL-USWA
STL-PDX
STL-SEA
STL-GEG
STL-PSC
What is the cheapest month to book a flight from St. Louis to State of Washington?
Currently, March is the cheapest month in which you can book a flight from St. Louis to State of Washington (average of $109). Flying from St. Louis to State of Washington in August is currently the most expensive (average of $228). 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 STL to WA?
Find hourly flight availability from St. Louis to Washington. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated marts 28, 2026.
Unlike in the morning, when flights are generally more expensive, you can save up to 15% on flights from St. Louis to State of Washington by exploring options for tickets in the evening.
What is the cheapest day to fly from St. Louis to State of Washington?
Use this chart to determine the cheapest time to fly round-trip from St. Louis to Washington. Price data was last updated on March 28, 2026.
Travelers seeking maximum savings on their St. Louis to State of Washington flight should consider departing on Saturday evenings when fares are most often at their lowest. Tuesday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
How much does it cost to fly round-trip from St. Louis to State of Washington?
Reviews of airlines servicing Washington
Get insights into the airlines that provide service to Washington. 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 Washington. Reviews last updated marts 28, 2026.
Read through reviews of airlines operating flights from St. Louis to Washington, such as Southwest,Alaska Airlines, andDelta. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Crew
8.6
Food
7.0
Overall
8.0
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Washington. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for St. Louis to Washington
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Complete your trip
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Find flights from St. Louis to Washington, based on your preferred cabin class, be it economy, premium economy, business, or first class.
St. Louis and Washington flights
Browse other St. Louis and Washington flight options. Last updated on marts 28, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
St. Louis to Washington flights
Consider these flights traveling from St. Louis to Washington.
Top 7 airlines flying from St. Louis to Washington
Discover the top 7 airlines that operate flights from St. Louis to Washington. 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 marts 28, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$89 | Average$217 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$94 | Average$347 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$151 | Average$472 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$176 | Average$419 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$178 | Average$422 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$188 | Average$394 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$198 | Average$359 | FlexibilityNo cancel fee | On-time85% |