$109+ Cheap flights from St. Louis (STL) to Washington
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/24. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SEA
Oct 25 — Nov 11
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to Washington 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 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 September 25, 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 September 25, 2026.
This Southwest deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” 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 12/125:50 am -
1 stop7h 00m
Tue 12/159:25 am -
1 stop7h 10m
Deal found 9/21![Southwest logo]()
$212
This Delta deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” 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 10/243:35 pm -
1 stop7h 15m
Sat 10/315:30 am -
1 stop6h 02m
Deal found 9/21![Delta logo]()
$217
This Southwest deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” 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 10/205:20 am -
2 stops10h 15m
Tue 10/273:30 pm -
1 stop5h 45m
Deal found 9/20![Southwest logo]()
$222
This American Airlines deal was found by Cheapflights users on 9/24. 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.
Fri 11/67:26 am -
1 stop8h 54m
Sun 11/83:10 pm -
1 stop6h 45m
Deal found 9/24![American Airlines logo]()
$226
This Southwest deal was found by Cheapflights users on 9/22. Clicking the “Pick Dates” 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 11/67:15 pm -
1 stop7h 30m
Thu 11/1212:15 am -
1 stop7h 50m
Deal found 9/22![Southwest logo]()
$227
This Southwest deal was found by Cheapflights users on 9/23. 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.
Sat 10/248:25 am -
2 stops13h 40m
Sat 10/317:40 am -
1 stop9h 05m
Deal found 9/23![Southwest logo]()
$228
This Southwest deal was found by Cheapflights users on 9/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/232:25 pm -
1 stop8h 10m
Mon 10/266:50 pm -
1 stop13h 00m
Deal found 9/22![Southwest logo]()
$232
This Southwest deal was found by Cheapflights users on 9/24. 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.
Mon 11/27:15 pm -
1 stop7h 25m
Tue 11/35:15 am -
2 stops13h 50m
Deal found 9/24![Southwest logo]()
$233
This Southwest deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/305:50 pm -
2 stops8h 50m
Mon 11/211:20 am -
2 stops11h 30m
Deal found 9/21![Southwest logo]()
$237
This American Airlines deal was found by Cheapflights users on 9/23. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/255:40 am -
1 stop7h 34m
Tue 10/276:12 am -
1 stop8h 41m
Deal found 9/23![American Airlines logo]()
$257
This Delta deal was found by Cheapflights users on 9/23. 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.
Wed 11/116:13 am -
1 stop7h 53m
Mon 11/165:04 pm -
1 stop5h 36m
Deal found 9/23![Delta logo]()
$369
This United Airlines deal was found by Cheapflights users on 9/23. 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.
Wed 11/111:08 pm -
2 stops10h 03m
Mon 11/161:49 pm -
1 stop5h 10m
Deal found 9/23![United Airlines logo]()
$374
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 September 25, 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 September 25, 2026.
This Southwest deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/59:45 pm -
1 stop12h 40m
Sun 11/811:20 am -
2 stops11h 35m
Deal found 9/21![Southwest logo]()
$343
This United Airlines deal was found by Cheapflights users on 9/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/228:00 am -
1 stop9h 51m
Thu 10/297:35 pm -
2 stops12h 57m
Deal found 9/22![United Airlines logo]()
$352
This Delta deal was found by Cheapflights users on 9/24. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/116:13 am -
1 stop7h 53m
Mon 11/165:04 pm -
1 stop5h 36m
Deal found 9/24![Delta logo]()
$369
This American Airlines deal was found by Cheapflights users on 9/25. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/207:29 am -
1 stop6h 21m
Thu 10/2212:49 pm -
1 stop7h 10m
Deal found 9/25![American Airlines logo]()
$369
This Alaska Airlines deal was found by Cheapflights users on 9/24. 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.
Mon 11/26:00 am -
Nonstop4h 36m
Tue 11/38:22 am -
Nonstop4h 03m
Deal found 9/24![Alaska Airlines logo]()
$397
This American Airlines deal was found by Cheapflights users on 9/24. 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.
Fri 11/66:00 am -
Nonstop4h 36m
Sun 11/88:22 am -
Nonstop4h 03m
Deal found 9/24![Multiple Airlines logo]()
$496
This Southwest deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” 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 12/258:25 am -
2 stops12h 35m
Sun 1/106:35 am -
1 stop8h 00m
Deal found 9/21![Southwest logo]()
$348
This Southwest deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” 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 11/113:10 pm -
2 stops8h 45m
Mon 11/162:15 pm -
1 stop6h 55m
Deal found 9/21![Southwest logo]()
$374
This United Airlines deal was found by Cheapflights users on 9/24. 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.
Mon 11/21:08 pm -
1 stop7h 55m
Tue 11/311:15 pm -
1 stop9h 33m
Deal found 9/24![United Airlines logo]()
$417
This Alaska Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” 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 2/123:24 pm -
Nonstop4h 28m
Sun 2/145:50 pm -
Nonstop3h 54m
Deal found 9/21![Alaska Airlines logo]()
$447
This United Airlines deal was found by Cheapflights users on 9/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/106:30 am -
2 stops8h 13m
Thu 12/245:00 am -
2 stops11h 18m
Deal found 9/22![United Airlines logo]()
$444
This Southwest deal was found by Cheapflights users on 9/22. Clicking the “Pick Dates” 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 12/106:30 am -
1 stop5h 45m
Thu 12/246:05 am -
2 stops10h 30m
Deal found 9/22![Southwest logo]()
$414
This Alaska Airlines deal was found by Cheapflights users on 9/22. Clicking the “Pick Dates” 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 10/137:02 am -
Nonstop4h 33m
Sun 10/256:03 pm -
Nonstop3h 56m
Deal found 9/22![Alaska Airlines logo]()
$487
This Delta deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/610:14 am -
2 stops11h 21m
Sat 10/105:20 am -
2 stops9h 18m
Deal found 9/21![Delta logo]()
$542
This United Airlines deal was found by Cheapflights users on 9/23. 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.
Fri 10/238:00 am -
2 stops14h 37m
Sun 10/257:00 am -
1 stop6h 43m
Deal found 9/23![United Airlines logo]()
$448
This Southwest deal was found by Cheapflights users on 9/22. Clicking the “Pick Dates” 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 12/112:40 pm -
2 stops11h 50m
Thu 12/101:35 pm -
1 stop5h 30m
Deal found 9/22![Southwest logo]()
$434
This Alaska Airlines deal was found by Cheapflights users on 9/23. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/134:42 pm -
Nonstop4h 28m
Tue 10/276:03 pm -
Nonstop3h 56m
Deal found 9/23![Alaska Airlines logo]()
$497
This United Airlines deal was found by Cheapflights users on 9/24. 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.
Fri 10/239:04 am -
2 stops13h 33m
Mon 10/2611:59 pm -
1 stop8h 03m
Deal found 9/24![United Airlines logo]()
$452
This Southwest deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” 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 3/13:00 pm -
2 stops9h 15m
Mon 3/81:10 pm -
2 stops8h 45m
Deal found 9/21![Southwest logo]()
$461
This United Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” 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 10/2411:35 am -
2 stops12h 36m
Tue 10/271:49 pm -
1 stop5h 10m
Deal found 9/21![United Airlines logo]()
$484
This Alaska Airlines deal was found by Cheapflights users on 9/24. 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.
Sat 1/303:54 pm -
1 stop9h 59m
Tue 2/26:08 am -
1 stop6h 48m
Deal found 9/24![Alaska Airlines logo]()
$534
This American Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” 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 10/612:47 pm -
2 stops13h 12m
Sat 10/105:15 am -
2 stops11h 05m
Deal found 9/21![American Airlines logo]()
$751
This United Airlines deal was found by Cheapflights users on 9/25. 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.
Thu 1/71:09 pm -
2 stops11h 29m
Mon 1/187:00 am -
1 stop27h 13m
Deal found 9/25![United Airlines logo]()
$495
This Alaska Airlines deal was found by Cheapflights users on 9/24. 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.
Sat 10/244:42 pm -
2 stops25h 41m
Wed 10/285:00 pm -
2 stops28h 59m
Deal found 9/24![Alaska Airlines logo]()
$561
This Alaska Airlines deal was found by Cheapflights users on 9/24. 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.
Fri 12/256:04 am -
1 stop8h 59m
Sat 1/27:59 pm -
1 stop17h 35m
Deal found 9/24![Alaska Airlines logo]()
$561
This Alaska Airlines deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” 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 2/63:54 pm -
1 stop22h 15m
Tue 2/96:15 am -
1 stop6h 41m
Deal found 9/20![Alaska Airlines logo]()
$580
This Expedia deal was found by Cheapflights users on 9/24. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/26:04 am -
1 stop9h 54m
Mon 1/47:20 pm -
1 stop17h 36m
Deal found 9/24![Alaska Airlines logo]()
$583
This Alaska Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” 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.
Mon 1/46:04 am -
1 stop10h 29m
Fri 1/81:59 pm -
1 stop22h 57m
Deal found 9/21![Alaska Airlines logo]()
$592
This Priceline deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/64:42 pm -
1 stop9h 17m
Sat 10/105:15 am -
1 stop8h 29m
Deal found 9/21![Alaska Airlines logo]()
$640
This Travelocity deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/242:50 pm -
2 stops10h 08m
Mon 12/282:38 pm -
1 stop7h 20m
Deal found 9/21![Alaska Airlines logo]()
$793
Last-minute flights from St. Louis to WashingtonDiscover last-minute flight deals from St. Louis to Washington. Data last updated September 25, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Washington. Data last updated September 25, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/144:19 pm -
1 stop24h 53m
Wed 10/2812:14 pm -
1 stop22h 19m
Deal found 9/21![Frontier logo]()
$284
This American Airlines deal was found by Cheapflights users on 9/24. 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.
Thu 10/157:29 am -
1 stop6h 21m
Sun 10/182:08 pm -
1 stop8h 11m
Deal found 9/24![American Airlines logo]()
$440
This American Airlines deal was found by Cheapflights users on 9/23. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/175:00 am -
1 stop8h 50m
Wed 10/2112:49 pm -
1 stop7h 10m
Deal found 9/23![American Airlines logo]()
$369
This Southwest deal was found by Cheapflights users on 9/20. Clicking the “Pick Dates” 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 10/205:20 am -
2 stops10h 15m
Tue 10/273:30 pm -
1 stop5h 45m
Deal found 9/20![Southwest logo]()
$222
This Southwest deal was found by Cheapflights users on 9/24. 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.
Thu 10/225:10 am -
2 stops8h 30m
Thu 10/295:00 am -
1 stop6h 45m
Deal found 9/24![Southwest logo]()
$445
This Southwest deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/232:25 pm -
2 stops10h 10m
Tue 10/2712:10 am -
1 stop7h 15m
Deal found 9/21![Southwest logo]()
$227
This Southwest deal was found by Cheapflights users on 9/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/232:25 pm -
1 stop8h 10m
Mon 10/266:50 pm -
1 stop13h 00m
Deal found 9/22![Southwest logo]()
$232
This Delta deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” 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 10/243:35 pm -
1 stop7h 15m
Sat 10/315:30 am -
1 stop6h 02m
Deal found 9/21![Delta logo]()
$217
This Southwest deal was found by Cheapflights users on 9/23. 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.
Sat 10/248:25 am -
2 stops13h 40m
Sat 10/317:40 am -
1 stop9h 05m
Deal found 9/23![Southwest logo]()
$228
This American Airlines deal was found by Cheapflights users on 9/24. 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.
Sat 10/245:40 am -
1 stop8h 19m
Sun 10/252:08 pm -
1 stop8h 11m
Deal found 9/24![American Airlines logo]()
$423
This American Airlines deal was found by Cheapflights users on 9/23. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/255:40 am -
1 stop7h 34m
Tue 10/276:12 am -
1 stop8h 41m
Deal found 9/23![American Airlines logo]()
$257
This Southwest deal was found by Cheapflights users on 9/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/302:25 pm -
2 stops10h 10m
Mon 11/211:20 am -
2 stops11h 30m
Deal found 9/22![Southwest logo]()
$237
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 September 25, 2026.
Search for one-way flight options from St. Louis to Washington. Find affordable one-way fares based on user searches. Data last updated September 25, 2026.
This Delta deal was found by Cheapflights users on 9/25. 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.
Sat 10/247:45 am -
1 stop9h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/25![Delta logo]()
$109
This Delta deal was found by Cheapflights users on 9/24. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/225:22 pm -
1 stop8h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/24![Delta logo]()
$114
This Southwest deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/232:25 pm -
2 stops10h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![Southwest logo]()
$119
This Southwest deal was found by Cheapflights users on 9/25. 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.
Sat 10/248:25 am -
2 stops13h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/25![Southwest logo]()
$120
This American Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” 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 12/16:00 am -
1 stop10h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![American Airlines logo]()
$140
This Super.com deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/191:28 pm -
1 stop25h 09m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![Frontier logo]()
$148
This Kiwi.com deal was found by Cheapflights users on 9/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/233:04 pm -
1 stop26h 18m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![Frontier logo]()
$153
This Kiwi.com deal was found by Cheapflights users on 9/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/268:00 pm -
2 stops48h 54m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![Frontier logo]()
$155
This United Airlines deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” 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.
Tue 11/38:50 am -
2 stops9h 37m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![United Airlines logo]()
$156
This Kiwi.com deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” 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 11/184:18 pm -
2 stops19h 27m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/21![Frontier logo]()
$162
This Kiwi.com deal was found by Cheapflights users on 9/25. 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.
Wed 10/712:17 pm -
1 stop29h 17m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/25![Multiple Airlines logo]()
$169
This United Airlines deal was found by Cheapflights users on 9/23. 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.
Wed 10/216:00 am -
1 stop7h 39m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/23![United Airlines logo]()
$185
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 September 25, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $212 (Southwest) |
One-way from | $109 (Delta) |
Popular in | July |
Cheapest in | February |
Average price | $378 |
Good round-trip deal | $425 or less |
Good one-way deal | $253 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 7,457,451 searches. Data last updated September 25, 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 Lambert-St Louis - SEA Seattle/Tacoma Intl
STLSEA
Lambert-St Louis
Mon 11/23
7:00 pm-11:59 pm
1 stop6h 59m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$114
St. LouisSeattle
STL Lambert-St Louis - SEA Seattle/Tacoma Intl
STLSEA
Lambert-St Louis
Mon 10/26
7:05 pm-12:59 am
1 stop7h 54m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$114
St. LouisSeattle
STL Lambert-St Louis - SEA Seattle/Tacoma Intl
STLSEA
Lambert-St Louis
Sun 11/1
8:00 am-4:27 pm
1 stop10h 27m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$114
St. LouisSeattle
STL Lambert-St Louis - SEA Seattle/Tacoma Intl
STLSEA
Lambert-St Louis
Wed 12/23
6:09 pm-11:16 pm
1 stop7h 07m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$174
St. LouisSeattle
STL Lambert-St Louis - SEA Seattle/Tacoma Intl
STLSEA
Lambert-St Louis
Mon 11/23
10:53 am-9:50 pm
2 stops12h 57m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$179
St. LouisSpokane
STL Lambert-St Louis - GEG Spokane
STLGEG
Lambert-St Louis
Mon 10/19
6:20 pm-12:35 am
1 stop8h 15m
Spokane
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$185
St. LouisSpokane
STL Lambert-St Louis - GEG Spokane
STLGEG
Lambert-St Louis
Wed 10/14
7:00 pm-11:44 pm
1 stop6h 44m
Spokane
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$185
St. LouisSpokane
STL Lambert-St Louis - GEG Spokane
STLGEG
Lambert-St Louis
Mon 10/26
6:20 pm-12:35 am
1 stop8h 15m
Spokane
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$185
St. LouisSpokane
STL Lambert-St Louis - GEG Spokane
STLGEG
Lambert-St Louis
Sat 10/17
7:45 am-12:19 pm
1 stop6h 34m
Spokane
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$185
St. LouisSpokane
STL Lambert-St Louis - GEG Spokane
STLGEG
Lambert-St Louis
Tue 10/20
7:45 am-12:19 pm
1 stop6h 34m
Spokane
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$185
Showing 1-10 of 58 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-SEA
STL-GEG
STL-PSC
STL-BLI
STL-PUW
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-SEA
STL-GEG
STL-PSC
STL-BLI
What is the cheapest month to book a flight from St. Louis to State of Washington?
Currently, February is the cheapest month in which you can book a flight from St. Louis to State of Washington (average of $244). Flying from St. Louis to State of Washington in July is currently the most expensive (average of $513). 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 September 25, 2026.
Unlike at noon, 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.
How much does it cost to fly round-trip from St. Louis to State of Washington?
Airfare is below average for this route at the moment.
St. Louis to State of Washington flights typically cost between $261 and $460 in December.The cheapest round-trip price found within the last 5 days was $212 on Southwest (Dec 12-Dec 15).
How far ahead should I book a flight from St. Louis to State of Washington?
To ensure you get the cheapest price possible for a flight from St. Louis to State of Washington, you should look to book at least 43 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
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 September 19, 2026.
Travelers seeking maximum savings on their St. Louis to State of Washington flight should consider departing on Saturday afternoons when fares are most often at their lowest. Wednesday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
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 September 25, 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.
Boarding
8.1
Comfort
8.0
Overall
8.0
Entertainment
7.5
Food
7.0
Crew
8.6
Reviews
1 / 20
4.0
OkaySteven,Sep 2026
OGG - HNL
Boarding
8.1
Comfort
8.0
Overall
8.0
Entertainment
7.5
Food
7.0
Crew
8.6
Reviews
1 / 20
4.0
OkaySteven,Sep 2026
OGG - HNL
Boarding
8.1
Comfort
8.0
Overall
8.0
Entertainment
7.5
Food
7.0
Crew
8.6
Reviews
1 / 20
4.0
OkaySteven,Sep 2026
OGG - HNL
Boarding
8.1
Comfort
8.0
Overall
8.0
Entertainment
7.5
Food
7.0
Crew
8.6
Reviews
1 / 20
4.0
OkaySteven,Sep 2026
OGG - HNL
Boarding
8.1
Comfort
8.0
Overall
8.0
Entertainment
7.5
Food
7.0
Crew
8.6
Reviews
1 / 20
4.0
OkaySteven,Sep 2026
OGG - HNL
Boarding
8.1
Comfort
8.0
Overall
8.0
Entertainment
7.5
Food
7.0
Crew
8.6
Reviews
1 / 20
4.0
OkaySteven,Sep 2026
OGG - HNL
Related info for your journey
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Alternative routes for St. Louis to Washington
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Complete your trip
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St. Louis and Washington flights
Browse other St. Louis and Washington flight options. Last updated on September 25, 2026.
Popular flight searches
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St. Louis to Washington flights
Consider these flights traveling from St. Louis to Washington.
Top 6 airlines flying from St. Louis to Washington
Discover the top 6 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 7,457,451 searches. Data last updated September 25, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$129 | Average$281 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$134 | Average$398 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$177 | Average$414 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$186 | Average$423 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$219 | Average$432 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$219 | Average$534 | FlexibilityNo cancel fee | On-time75% |