$135+ Cheap flights from St. Louis (STL) to Idaho
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 12/2. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BOI
Oct 15 — Oct 221
Round-trip
1 adult, Economy
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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 IdahoExplore the most affordable flight options available from St. Louis to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2026.
Explore the most affordable flight options available from St. Louis to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2026.
This United Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 10/147:08 am -
1 stop6h 55m
Tue 10/205:30 pm -
1 stop5h 14m
Deal found 9/15![United Airlines logo]()
$269
This American Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 10/145:40 am -
1 stop6h 44m
Tue 10/202:02 pm -
2 stops8h 40m
Deal found 9/15![American Airlines logo]()
$274
This American Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 10/205:40 am -
2 stops8h 42m
Wed 10/212:02 pm -
2 stops8h 40m
Deal found 9/15![American Airlines logo]()
$280
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 10/137:00 pm -
1 stop5h 59m
Mon 10/196:49 pm -
1 stop4h 55m
Deal found 9/15![Delta logo]()
$288
This Southwest deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 11/33:25 pm -
1 stop9h 00m
Tue 11/102:15 pm -
1 stop6h 55m
Deal found 9/15![Southwest logo]()
$305
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 10/167:00 pm -
1 stop5h 59m
Wed 10/2111:32 am -
1 stop5h 12m
Deal found 9/15![Delta logo]()
$306
This American Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 11/312:58 pm -
1 stop9h 42m
Tue 11/106:25 am -
2 stops10h 57m
Deal found 9/15![American Airlines logo]()
$310
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 10/167:00 pm -
1 stop5h 59m
Mon 10/196:49 pm -
1 stop4h 55m
Deal found 9/15![Delta logo]()
$325
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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 10/197:00 pm -
1 stop6h 44m
Wed 10/215:04 pm -
1 stop5h 40m
Deal found 9/14![Delta logo]()
$327
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 10/167:00 pm -
1 stop5h 59m
Fri 10/236:00 am -
1 stop6h 32m
Deal found 9/15![Delta logo]()
$343
This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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 10/95:00 am -
1 stop8h 50m
Sat 10/1012:49 pm -
1 stop8h 53m
Deal found 9/14![American Airlines logo]()
$348
This Delta deal was found by Cheapflights users on 9/10. 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.
Sat 10/1010:35 am -
2 stops12h 47m
Sat 10/177:20 pm -
2 stops12h 29m
Deal found 9/10![Delta logo]()
$353
Best flights from St. Louis to IdahoDiscover carefully curated flight deals from St. Louis to Idaho that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 15, 2026.
Discover carefully curated flight deals from St. Louis to Idaho that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 15, 2026.
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 10/207:45 am -
1 stop5h 31m
Wed 10/215:30 am -
1 stop5h 38m
Deal found 9/15![Delta logo]()
$269
This American Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 11/312:58 pm -
1 stop9h 42m
Tue 11/106:25 am -
2 stops10h 57m
Deal found 9/15![American Airlines logo]()
$310
This Southwest deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 11/36:30 am -
2 stops9h 00m
Tue 11/106:05 am -
2 stops9h 20m
Deal found 9/15![Southwest logo]()
$315
This Alaska Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/154:42 pm -
1 stop8h 17m
Wed 10/212:06 pm -
1 stop8h 53m
Deal found 9/15![Alaska Airlines logo]()
$363
This United Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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 9/14![United Airlines logo]()
$400
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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 10/197:00 pm -
1 stop6h 44m
Wed 10/215:04 pm -
1 stop5h 40m
Deal found 9/14![Delta logo]()
$327
This Southwest deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/275:50 pm -
1 stop6h 35m
Tue 11/37:35 am -
2 stops10h 15m
Deal found 9/12![Southwest logo]()
$374
This American Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” 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 10/95:00 am -
1 stop8h 50m
Tue 10/132:08 pm -
1 stop8h 11m
Deal found 9/13![American Airlines logo]()
$396
This Alaska Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/217:02 am -
1 stop6h 37m
Thu 10/291:38 pm -
1 stop8h 21m
Deal found 9/11![Alaska Airlines logo]()
$399
This Delta deal was found by Cheapflights users on 9/10. 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.
Thu 12/33:32 pm -
2 stops10h 27m
Sun 12/65:00 am -
2 stops9h 30m
Deal found 9/10![Delta logo]()
$379
This United Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” 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 10/149:00 am -
1 stop5h 24m
Mon 10/194:05 pm -
1 stop6h 39m
Deal found 9/13![United Airlines logo]()
$422
This Alaska Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/154:42 pm -
1 stop8h 17m
Fri 10/234:18 pm -
1 stop6h 41m
Deal found 9/15![Alaska Airlines logo]()
$400
This United Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1611:35 am -
1 stop8h 06m
Tue 10/201:40 pm -
1 stop5h 56m
Deal found 9/11![United Airlines logo]()
$425
This Delta deal was found by Cheapflights users on 9/10. 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.
Thu 11/122:20 pm -
1 stop6h 04m
Sun 11/155:00 am -
2 stops9h 31m
Deal found 9/10![Delta logo]()
$402
This Alaska Airlines deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/246:02 am -
1 stop7h 37m
Tue 10/277:20 am -
1 stop6h 24m
Deal found 9/12![Alaska Airlines logo]()
$409
This American Airlines deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/15:43 am -
1 stop7h 02m
Mon 10/51:50 pm -
1 stop6h 07m
Deal found 9/12![American Airlines logo]()
$454
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Fri 11/68:50 am -
1 stop5h 35m
Wed 11/1110:37 am -
1 stop5h 20m
Deal found 9/10![United Airlines logo]()
$425
This Southwest deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” 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 11/134:00 pm -
2 stops8h 00m
Sun 11/158:30 pm -
2 stops12h 05m
Deal found 9/13![Southwest logo]()
$485
This United Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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 10/144:39 pm -
1 stop5h 07m
Wed 10/212:48 pm -
1 stop7h 56m
Deal found 9/14![United Airlines logo]()
$445
This Delta deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected ” under the list of providers to see comparable flight deals.
Tue 10/277:45 am -
1 stop5h 23m
Wed 11/117:25 am -
1 stop5h 05m
Deal found 9/11![Delta logo]()
$445
This Alaska Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” 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 9/283:19 pm -
1 stop8h 37m
Fri 10/22:01 pm -
1 stop8h 58m
Deal found 9/13![Alaska Airlines logo]()
$459
This United Airlines deal was found by Cheapflights users on 9/10. 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 11/1010:53 am -
2 stops13h 40m
Wed 11/112:51 pm -
1 stop5h 08m
Deal found 9/10![United Airlines logo]()
$464
This Southwest deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” 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 10/115:35 am -
1 stop6h 10m
Sun 10/183:30 pm -
2 stops8h 10m
Deal found 9/13![Southwest logo]()
$581
This American Airlines deal was found by Cheapflights users on 9/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/95:00 am -
1 stop8h 19m
Thu 10/156:07 pm -
2 stops15h 43m
Deal found 9/10![American Airlines logo]()
$598
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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 9/298:46 am -
2 stops10h 31m
Sat 10/31:05 pm -
2 stops9h 11m
Deal found 9/14![Delta logo]()
$539
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/11:55 pm -
2 stops9h 27m
Mon 10/56:57 pm -
1 stop4h 47m
Deal found 9/14![Delta logo]()
$539
This United Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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 9/219:00 am -
1 stop4h 44m
Fri 9/257:50 am -
1 stop6h 53m
Deal found 9/14![United Airlines logo]()
$539
This Alaska Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” 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 9/283:19 pm -
1 stop9h 25m
Fri 10/22:16 pm -
1 stop8h 43m
Deal found 9/13![Alaska Airlines logo]()
$617
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/292:25 pm -
2 stops8h 23m
Wed 11/46:04 am -
1 stop6h 28m
Deal found 9/14![Delta logo]()
$542
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Thu 10/15:10 am -
1 stop5h 43m
Mon 10/54:05 pm -
1 stop6h 39m
Deal found 9/10![United Airlines logo]()
$557
Last-minute flights from St. Louis to IdahoDiscover last-minute flight deals from St. Louis to Idaho. Data last updated September 15, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Idaho. Data last updated September 15, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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 10/95:00 am -
1 stop8h 50m
Sat 10/1012:49 pm -
1 stop8h 53m
Deal found 9/14![American Airlines logo]()
$348
This Delta deal was found by Cheapflights users on 9/10. 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.
Sat 10/1010:35 am -
2 stops12h 47m
Sat 10/177:20 pm -
2 stops12h 29m
Deal found 9/10![Delta logo]()
$353
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 10/137:00 pm -
1 stop5h 59m
Mon 10/196:49 pm -
1 stop4h 55m
Deal found 9/15![Delta logo]()
$288
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 10/147:00 pm -
1 stop5h 59m
Wed 10/2111:32 am -
1 stop5h 12m
Deal found 9/15![Delta logo]()
$269
This American Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 10/145:40 am -
1 stop6h 44m
Tue 10/202:02 pm -
2 stops8h 40m
Deal found 9/15![American Airlines logo]()
$274
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 10/167:00 pm -
1 stop5h 59m
Sat 10/173:00 pm -
1 stop7h 21m
Deal found 9/15![Delta logo]()
$306
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 10/167:00 pm -
1 stop5h 59m
Mon 10/196:49 pm -
1 stop4h 55m
Deal found 9/15![Delta logo]()
$325
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 10/167:00 pm -
1 stop5h 59m
Fri 10/236:00 am -
1 stop6h 32m
Deal found 9/15![Delta logo]()
$343
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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 10/197:00 pm -
1 stop6h 44m
Wed 10/215:04 pm -
1 stop5h 40m
Deal found 9/14![Delta logo]()
$327
This American Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 10/205:40 am -
2 stops8h 42m
Wed 10/212:02 pm -
2 stops8h 40m
Deal found 9/15![American Airlines logo]()
$280
This American Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 10/247:28 am -
1 stop6h 22m
Tue 10/2712:49 pm -
1 stop7h 11m
Deal found 9/15![American Airlines logo]()
$305
This United Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 10/246:00 am -
2 stops8h 34m
Tue 10/275:00 am -
2 stops8h 43m
Deal found 9/15![United Airlines logo]()
$350
One-way flights from St. Louis to IdahoSearch for one-way flight options from St. Louis to Idaho. Find affordable one-way fares based on user searches. Data last updated September 15, 2026.
Search for one-way flight options from St. Louis to Idaho. Find affordable one-way fares based on user searches. Data last updated September 15, 2026.
This deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/15:20 pm -
1 stop7h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/14![Delta logo]()
$135
This Southwest deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” 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 10/218:50 pm -
2 stops16h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![Southwest logo]()
$164
This CheapOair deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” 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 10/712:17 pm -
1 stop26h 38m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/14![Frontier logo]()
$170
This Kiwi.com deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/22:59 pm -
2 stops28h 02m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/11![Frontier logo]()
$175
This American Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” 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 10/218:03 am -
1 stop7h 26m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![American Airlines logo]()
$185
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” 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 11/66:21 am -
1 stop7h 54m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Delta logo]()
$196
This United Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” 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 10/211:29 pm -
2 stops10h 47m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![United Airlines logo]()
$200
This American Airlines deal was found by Cheapflights users on 9/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/95:00 am -
1 stop8h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![American Airlines logo]()
$203
This Alaska Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/227:02 am -
1 stop9h 38m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/11![Alaska Airlines logo]()
$205
This American Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/16:00 am -
1 stop6h 28m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/11![American Airlines logo]()
$209
This American Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/66:00 am -
1 stop8h 01m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/11![American Airlines logo]()
$212
This Kiwi.com deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/16:05 pm -
2 stops48h 56m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/11![Frontier logo]()
$225
Find flight deals from St. Louis to Idaho
Keep the following information in mind while searching for St. Louis to Idaho flight deals. Data was last updated September 15, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $269 (United Airlines) |
One-way from | $135 |
Popular in | February |
Cheapest in | January |
Average price | $482 |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Idaho 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 15, 2026.
Use the filters below to find and compare flights from St. Louis to Idaho that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisBoise
STL Lambert-St Louis - BOI Boise Air Term. Gowen Fld
STLBOI
Lambert-St Louis
Wed 12/2
6:03 am-12:42 pm
1 stop7h 39m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$135
St. LouisSpokane
STL Lambert-St Louis - GEG Spokane
STLGEG
Lambert-St Louis
Wed 10/21
8:50 pm-10:50 am
2 stops16h 00m
Spokane
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$164
St. LouisBoise
STL Lambert-St Louis - BOI Boise Air Term. Gowen Fld
STLBOI
Lambert-St Louis
Wed 10/7
12:17 pm-1:55 pm
1 stop26h 38m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$170
St. LouisSpokane
STL Lambert-St Louis - GEG Spokane
STLGEG
Lambert-St Louis
Thu 10/29
6:05 am-10:00 am
1 stop5h 55m
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 10/27
8:35 am-1:15 pm
1 stop6h 40m
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
Fri 11/6
6:21 am-12:15 pm
1 stop7h 54m
Spokane
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$196
St. LouisSpokane
STL Lambert-St Louis - GEG Spokane
STLGEG
Lambert-St Louis
Thu 10/22
7:02 am-2:40 pm
1 stop9h 38m
Spokane
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$205
St. LouisBoise
STL Lambert-St Louis - BOI Boise Air Term. Gowen Fld
STLBOI
Lambert-St Louis
Tue 12/1
6:00 am-11:28 am
1 stop6h 28m
Boise Air Term. Gowen Fld
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$209
St. LouisSpokane
STL Lambert-St Louis - GEG Spokane
STLGEG
Lambert-St Louis
Fri 11/6
6:00 am-12:01 pm
1 stop8h 01m
Spokane
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$212
St. LouisSpokane
STL Lambert-St Louis - GEG Spokane
STLGEG
Lambert-St Louis
Fri 10/30
2:22 pm-11:50 pm
2 stops11h 28m
Spokane
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$212
Showing 1-10 of 53 resultsSorted by cheapest first
Best time to book a flight from St. Louis to Idaho
Have a flexible travel schedule? Discover the best time to fly to Idaho from St. Louis with our price prediction graph.
STL-BOI
STL-GEG
STL-JAC
STL-IDA
STL-LWS
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 Idaho
STL-USID
STL-BOI
STL-GEG
STL-JAC
STL-IDA
What is the cheapest month to book a flight from St. Louis to Idaho?
Currently, January is the cheapest month in which you can book a flight from St. Louis to Idaho (average of $359). Flying from St. Louis to Idaho in February is currently the most expensive (average of $566). 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.
How much does it cost to fly round-trip from St. Louis to Idaho?
Airfare is below average for this route at the moment.
St. Louis to Idaho flights typically cost between $430 and $551 in October.The cheapest round-trip price found within the last 5 days was $269 on United Airlines (Oct 14-Oct 20).
Reviews of airlines servicing Idaho
Get insights into the airlines that provide service to Idaho. 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 Idaho. Reviews last updated September 15, 2026.
Peruse reviews from past customers who have flown with Southwest,Delta, andUnited Airlines from St. Louis to Idaho to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.6
Comfort
8.0
Boarding
8.1
Food
7.0
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
4.0
OkaySteven,Sep 2026
OGG - HNL
Crew
8.6
Comfort
8.0
Boarding
8.1
Food
7.0
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
4.0
OkaySteven,Sep 2026
OGG - HNL
Crew
8.6
Comfort
8.0
Boarding
8.1
Food
7.0
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
4.0
OkaySteven,Sep 2026
OGG - HNL
Crew
8.6
Comfort
8.0
Boarding
8.1
Food
7.0
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
4.0
OkaySteven,Sep 2026
OGG - HNL
Crew
8.6
Comfort
8.0
Boarding
8.1
Food
7.0
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
4.0
OkaySteven,Sep 2026
OGG - HNL
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Idaho. 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 Idaho
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Complete your trip
Complete your trip to Idaho by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from St. Louis to Idaho by cabin class
Find flights from St. Louis to Idaho, based on your preferred cabin class, be it economy, premium economy, business, or first class.
St. Louis and Idaho flights
Browse other St. Louis and Idaho flight options. Last updated on September 15, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
St. Louis to Idaho flights
Consider these flights traveling from St. Louis to Idaho.
Top 4 airlines flying from St. Louis to Idaho
Discover the top 4 airlines that operate flights from St. Louis to Idaho. 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 15, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$207 | Average$430 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$240 | Average$459 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$290 | Average$492 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$336 | Average$501 | FlexibilityNo cancel fee | On-time63% |