$104+ 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 11/7. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — STL
Sep 9 — Sep 161
Round-trip
1 adult, Economy
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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 August 10, 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 August 10, 2026.
This Delta deal was found by Cheapflights users on 8/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/212:25 am -
1 stop8h 09m
Sat 10/35:00 pm -
1 stop7h 33m
Deal found 8/10![Delta logo]()
$229
This Southwest deal was found by Cheapflights users on 8/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/111:35 pm -
1 stop7h 25m
Tue 10/64:05 pm -
1 stop9h 00m
Deal found 8/9![Southwest logo]()
$230
This Kiwi.com deal was found by Cheapflights users on 8/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/135:35 pm -
1 stop23h 40m
Thu 10/298:10 pm -
1 stop22h 25m
Deal found 8/7![Frontier logo]()
$236
This CheapOair deal was found by Cheapflights users on 8/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/129:34 pm -
1 stop25h 43m
Mon 10/198:10 pm -
1 stop22h 25m
Deal found 8/10![Frontier logo]()
$240
This Kiwi.com deal was found by Cheapflights users on 8/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1512:34 pm -
1 stop28h 41m
Thu 10/298:10 pm -
1 stop22h 25m
Deal found 8/7![Frontier logo]()
$248
This CheapOair deal was found by Cheapflights users on 8/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/89:34 pm -
1 stop25h 43m
Sun 10/115:19 pm -
1 stop29h 20m
Deal found 8/7![Frontier logo]()
$259
This Southwest deal was found by Cheapflights users on 8/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/25:20 am -
2 stops11h 45m
Tue 10/66:10 pm -
1 stop6h 00m
Deal found 8/9![Southwest logo]()
$265
This Southwest deal was found by Cheapflights users on 8/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/911:30 pm -
1 stop9h 00m
Sun 9/139:55 pm -
Nonstop4h 15m
Deal found 8/9![Southwest logo]()
$279
This Kiwi.com deal was found by Cheapflights users on 8/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/145:35 pm -
2 stops14h 05m
Thu 10/298:10 pm -
1 stop22h 25m
Deal found 8/7![Frontier logo]()
$282
This Kiwi.com deal was found by Cheapflights users on 8/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1612:34 pm -
2 stops19h 06m
Thu 10/298:10 pm -
1 stop22h 25m
Deal found 8/7![Frontier logo]()
$283
This Kiwi.com deal was found by Cheapflights users on 8/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/87:06 pm -
1 stop22h 11m
Mon 9/148:10 pm -
1 stop20h 58m
Deal found 8/8![Frontier logo]()
$286
This Frontier deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/139:45 pm -
1 stop11h 32m
Fri 9/2512:17 pm -
1 stop8h 11m
Deal found 8/5![Frontier logo]()
$288
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 August 10, 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 August 10, 2026.
This Delta deal was found by Cheapflights users on 8/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/63:22 pm -
1 stop5h 59m
Mon 11/95:30 pm -
1 stop8h 29m
Deal found 8/10![Delta logo]()
$259
This Alaska Airlines deal was found by Cheapflights users on 8/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/228:13 am -
Nonstop4h 08m
Mon 9/286:08 pm -
1 stop6h 31m
Deal found 8/6![Alaska Airlines logo]()
$337
This United Airlines deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2111:04 pm -
2 stops10h 53m
Wed 9/231:36 pm -
2 stops11h 50m
Deal found 8/5![United Airlines logo]()
$337
This Southwest deal was found by Cheapflights users on 8/8. 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 9/2310:45 pm -
1 stop10h 50m
Wed 9/3012:20 pm -
2 stops9h 35m
Deal found 8/8![Southwest logo]()
$342
This American Airlines deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/1612:39 pm -
1 stop9h 04m
Tue 9/222:30 pm -
1 stop7h 09m
Deal found 8/5![American Airlines logo]()
$423
This Kiwi.com deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/174:59 pm -
1 stop16h 28m
Mon 9/2112:17 pm -
1 stop9h 55m
Deal found 8/5![Multiple Airlines logo]()
$512
This Southwest deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/412:40 pm -
1 stop9h 15m
Tue 9/85:20 pm -
1 stop6h 55m
Deal found 8/5![Southwest logo]()
$343
This Alaska Airlines deal was found by Cheapflights users on 8/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/167:09 am -
1 stop9h 29m
Tue 9/226:08 pm -
Nonstop4h 12m
Deal found 8/9![Alaska Airlines logo]()
$347
This Delta deal was found by Cheapflights users on 8/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/145:10 pm -
1 stop5h 34m
Mon 9/282:25 pm -
1 stop5h 51m
Deal found 8/6![Delta logo]()
$349
This United Airlines deal was found by Cheapflights users on 8/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/65:00 am -
2 stops8h 38m
Sun 9/135:10 am -
1 stop6h 23m
Deal found 8/9![United Airlines logo]()
$354
This Alaska Airlines deal was found by Cheapflights users on 8/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/66:03 pm -
Nonstop3h 56m
Fri 9/116:08 pm -
1 stop6h 31m
Deal found 8/7![Alaska Airlines logo]()
$363
This Southwest deal was found by Cheapflights users on 8/8. 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.
Sat 9/51:40 pm -
1 stop6h 45m
Fri 9/116:15 pm -
1 stop6h 30m
Deal found 8/8![Southwest logo]()
$369
This American Airlines deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/53:37 pm -
1 stop6h 19m
Mon 11/98:00 am -
1 stop9h 07m
Deal found 8/5![American Airlines logo]()
$435
This Southwest deal was found by Cheapflights users on 8/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/275:35 am -
2 stops10h 25m
Sat 8/2911:50 am -
1 stop7h 00m
Deal found 8/7![Southwest logo]()
$383
This Delta deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/215:14 pm -
1 stop5h 30m
Thu 9/246:55 pm -
1 stop6h 34m
Deal found 8/5![Delta logo]()
$423
This United Airlines deal was found by Cheapflights users on 8/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/102:27 pm -
1 stop6h 32m
Tue 10/131:36 pm -
2 stops11h 21m
Deal found 8/7![United Airlines logo]()
$442
This Alaska Airlines deal was found by Cheapflights users on 8/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/238:13 am -
Nonstop4h 08m
Sun 9/277:36 pm -
Nonstop4h 23m
Deal found 8/9![Alaska Airlines logo]()
$405
This Southwest deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/296:00 am -
2 stops9h 40m
Thu 11/54:00 pm -
2 stops9h 20m
Deal found 8/5![Southwest logo]()
$388
This Delta deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/165:10 am -
2 stops10h 27m
Tue 9/228:46 am -
2 stops8h 28m
Deal found 8/5![Delta logo]()
$433
This Alaska Airlines deal was found by Cheapflights users on 8/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1811:16 am -
Nonstop3h 54m
Mon 9/216:08 pm -
Nonstop4h 12m
Deal found 8/10![Alaska Airlines logo]()
$407
This Southwest deal was found by Cheapflights users on 8/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2812:05 pm -
2 stops8h 00m
Thu 11/55:05 am -
2 stops10h 50m
Deal found 8/7![Southwest logo]()
$389
This American Airlines deal was found by Cheapflights users on 8/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/265:15 am -
2 stops10h 50m
Mon 8/318:00 am -
1 stop8h 48m
Deal found 8/9![American Airlines logo]()
$538
This Alaska Airlines deal was found by Cheapflights users on 8/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/108:39 am -
1 stop9h 09m
Wed 10/147:02 am -
Nonstop4h 33m
Deal found 8/8![Alaska Airlines logo]()
$417
This United Airlines deal was found by Cheapflights users on 8/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/2512:54 pm -
1 stop5h 52m
Sat 8/297:00 am -
2 stops15h 37m
Deal found 8/10![United Airlines logo]()
$516
This Southwest deal was found by Cheapflights users on 8/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/712:05 pm -
2 stops8h 00m
Sat 10/108:25 am -
2 stops13h 35m
Deal found 8/9![Southwest logo]()
$404
This Alaska Airlines deal was found by Cheapflights users on 8/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/107:20 am -
1 stop6h 24m
Wed 10/147:02 am -
1 stop9h 38m
Deal found 8/6![Alaska Airlines logo]()
$423
This Southwest deal was found by Cheapflights users on 8/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/65:10 am -
2 stops11h 00m
Sun 9/138:30 am -
1 stop11h 35m
Deal found 8/8![Southwest logo]()
$414
This Alaska Airlines deal was found by Cheapflights users on 8/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/136:03 pm -
Nonstop3h 56m
Fri 9/187:36 pm -
Nonstop4h 23m
Deal found 8/7![Alaska Airlines logo]()
$427
This Southwest deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/185:00 am -
2 stops11h 20m
Wed 9/2312:20 pm -
2 stops9h 35m
Deal found 8/5![Southwest logo]()
$414
This Alaska Airlines deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/26:00 am -
1 stop6h 26m
Sat 2/63:24 pm -
1 stop7h 31m
Deal found 8/5![Alaska Airlines logo]()
$435
Last-minute flights from Washington to St. LouisDiscover last-minute flight deals from Washington to St. Louis. Data last updated August 10, 2026 and is based on user searches.
Discover last-minute flight deals from Washington to St. Louis. Data last updated August 10, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 8/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/267:06 pm -
2 stops19h 05m
Mon 8/317:58 pm -
1 stop15h 21m
Deal found 8/6![Frontier logo]()
$296
This Kiwi.com deal was found by Cheapflights users on 8/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/277:06 pm -
2 stops20h 16m
Mon 8/317:58 pm -
1 stop15h 21m
Deal found 8/7![Frontier logo]()
$289
This Kiwi.com deal was found by Cheapflights users on 8/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/292:37 pm -
2 stops23h 34m
Mon 8/317:58 pm -
1 stop15h 21m
Deal found 8/6![Frontier logo]()
$301
This CheapOair deal was found by Cheapflights users on 8/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/25:56 pm -
1 stop23h 17m
Wed 9/912:17 pm -
1 stop25h 19m
Deal found 8/7![Frontier logo]()
$290
This Super.com deal was found by Cheapflights users on 8/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/39:29 pm -
1 stop18h 21m
Tue 9/86:45 pm -
1 stop16h 57m
Deal found 8/9![Frontier logo]()
$297
This Kiwi.com deal was found by Cheapflights users on 8/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/87:06 pm -
1 stop22h 11m
Mon 9/148:10 pm -
1 stop20h 58m
Deal found 8/8![Frontier logo]()
$286
This CheapOair deal was found by Cheapflights users on 8/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/87:06 pm -
1 stop22h 11m
Sun 9/1312:27 pm -
1 stop23h 15m
Deal found 8/10![Frontier logo]()
$298
This Southwest deal was found by Cheapflights users on 8/9. 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 9/911:30 pm -
1 stop9h 00m
Sun 9/139:55 pm -
Nonstop4h 15m
Deal found 8/9![Southwest logo]()
$279
This Southwest deal was found by Cheapflights users on 8/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/111:30 pm -
1 stop7h 45m
Mon 9/146:15 pm -
1 stop6h 55m
Deal found 8/9![Southwest logo]()
$259
This Frontier deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/139:45 pm -
1 stop11h 32m
Fri 9/2512:17 pm -
1 stop8h 11m
Deal found 8/5![Frontier logo]()
$288
This Southwest deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/161:45 pm -
1 stop6h 55m
Wed 9/2311:55 am -
2 stops10h 25m
Deal found 8/5![Southwest logo]()
$293
This Southwest deal was found by Cheapflights users on 8/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/177:35 pm -
1 stop12h 25m
Sun 9/209:55 pm -
Nonstop4h 15m
Deal found 8/9![Southwest logo]()
$285
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 August 10, 2026.
Search for one-way flight options from Washington to St. Louis. Find affordable one-way fares based on user searches. Data last updated August 10, 2026.
This Southwest deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/711:45 am -
1 stop6h 15m
Deal found 8/5![Southwest logo]()
$104
This American Airlines deal was found by Cheapflights users on 8/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/33:41 pm -
1 stop6h 46m
Deal found 8/7![American Airlines logo]()
$108
This Delta deal was found by Cheapflights users on 8/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/611:10 pm -
1 stop8h 34m
Deal found 8/7![Delta logo]()
$109
This Southwest deal was found by Cheapflights users on 8/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/94:15 pm -
1 stop5h 30m
Deal found 8/7![Southwest logo]()
$114
This Southwest deal was found by Cheapflights users on 8/9. 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 9/911:30 pm -
1 stop7h 45m
Deal found 8/9![Southwest logo]()
$115
This Southwest deal was found by Cheapflights users on 8/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/59:25 pm -
1 stop12h 25m
Deal found 8/6![Southwest logo]()
$119
This Southwest deal was found by Cheapflights users on 8/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/46:55 am -
2 stops8h 30m
Deal found 8/9![Southwest logo]()
$120
This Trip.com deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2912:20 pm -
1 stop28h 53m
Deal found 8/5![Frontier logo]()
$123
This Kiwi.com deal was found by Cheapflights users on 8/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/812:34 pm -
1 stop28h 41m
Deal found 8/10![Frontier logo]()
$124
This Trip.com deal was found by Cheapflights users on 8/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1012:24 pm -
1 stop20h 53m
Deal found 8/7![Frontier logo]()
$125
This CheapOair deal was found by Cheapflights users on 8/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/169:34 pm -
1 stop25h 43m
Deal found 8/9![Frontier logo]()
$126
This Kiwi.com deal was found by Cheapflights users on 8/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/912:34 pm -
1 stop28h 41m
Deal found 8/7![Frontier logo]()
$127
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 August 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $229 (Delta) |
One-way from | $104 (Southwest) |
Popular in | July |
Cheapest in | January |
Average price | $463 |
Good round-trip deal | $407 or less |
Good one-way deal | $283 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from 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 August 10, 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
PortlandSt. Louis
PDX Portland - STL Lambert-St Louis
PDXSTL
Portland
Fri 11/6
3:22 pm-11:21 pm
1 stop5h 59m
Lambert-St Louis
Mon 11/9
5:30 pm-11:59 pm
1 stop8h 29m
$259
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Tue 9/22
8:13 am-2:21 pm
Nonstop4h 08m
Lambert-St Louis
Mon 9/28
6:08 pm-10:39 pm
1 stop6h 31m
$337
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Mon 9/21
11:04 pm-11:57 am
2 stops10h 53m
Lambert-St Louis
Wed 9/23
1:36 pm-11:26 pm
2 stops11h 50m
$337
PortlandSt. Louis
PDX Portland - STL Lambert-St Louis
PDXSTL
Portland
Wed 9/23
10:45 pm-11:35 am
1 stop10h 50m
Lambert-St Louis
Wed 9/30
12:20 pm-7:55 pm
2 stops9h 35m
$342
PortlandSt. Louis
PDX Portland - STL Lambert-St Louis
PDXSTL
Portland
Fri 9/4
12:40 pm-11:55 pm
1 stop9h 15m
Lambert-St Louis
Tue 9/8
5:20 pm-10:15 pm
1 stop6h 55m
$343
PortlandSt. Louis
PDX Portland - STL Lambert-St Louis
PDXSTL
Portland
Wed 9/16
7:09 am-6:38 pm
1 stop9h 29m
Lambert-St Louis
Tue 9/22
6:08 pm-8:20 pm
Nonstop4h 12m
$347
PortlandSt. Louis
PDX Portland - STL Lambert-St Louis
PDXSTL
Portland
Mon 9/14
5:10 pm-12:44 am
1 stop5h 34m
Lambert-St Louis
Mon 9/28
2:25 pm-6:16 pm
1 stop5h 51m
$349
PortlandSt. Louis
PDX Portland - STL Lambert-St Louis
PDXSTL
Portland
Sun 9/6
5:00 am-3:38 pm
2 stops8h 38m
Lambert-St Louis
Sun 9/13
5:10 am-9:33 am
1 stop6h 23m
$354
SeattleSt. Louis
SEA Seattle/Tacoma Intl - STL Lambert-St Louis
SEASTL
Seattle/Tacoma Intl
Sun 9/6
6:03 pm-11:59 pm
Nonstop3h 56m
Lambert-St Louis
Fri 9/11
6:08 pm-10:39 pm
1 stop6h 31m
$363
SpokaneSt. Louis
GEG Spokane - STL Lambert-St Louis
GEGSTL
Spokane
Sat 9/5
1:40 pm-10:25 pm
1 stop6h 45m
Lambert-St Louis
Fri 9/11
6:15 pm-10:45 pm
1 stop6h 30m
$369
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
GEG-STL
PDX-STL
BLI-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
GEG-STL
PDX-STL
BLI-STL
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 $279). Flying from State of Washington to St. Louis in July is currently the most expensive (average of $529). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from 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 August 10, 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 August 10, 2026.
The most flights from USWA to STL are scheduled on a Saturday (11 on average). You will have fewer flight options on Wednesday, 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?
Airfare is below average for this route at the moment.
State of Washington to St. Louis flights typically cost between $361 and $614 in October.The cheapest round-trip price found within the last 5 days was $262 on United Airlines (Oct 3-Oct 3).
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.
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
Fairview Heights
O'Fallon
Fenton
Swansea
Eureka
Maryland Heights
Collinsville
Wentzville
Glencoe
Chesterfield
Farmington
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Washington and St. Louis flights
Browse other Washington and St. Louis flight options. Last updated on August 10, 2026.
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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 August 10, 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 August 10, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$104 | Average$385 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$158 | Average$301 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$181 | Average$587 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$182 | Average$448 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$207 | Average$528 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$216 | Average$408 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$226 | Average$549 | FlexibilityNo cancel fee | On-time75% |