$104+ Cheap flights from St. Louis (STL) to Idaho
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 4/25. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BOI
Apr 1 — Apr 81
1 adult, Economy
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Find cheap flights from St. Louis to Idaho 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 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 March 2, 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 March 2, 2026.
This United Airlines deal was found by Cheapflights users on 2/25. 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.
Wed 3/255:15 am
STL
- JAC
1 stop5h 36m
United Airlines
Wed 4/12:35 pm
JAC
- STL
1 stop5h 19m
United Airlines
Deal found 2/25![United Airlines logo]()
$249
This Kiwi.com deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/147:00 am
STL
- BOI
1 stop7h 58m
Hawaiian Airlines
Tue 4/214:15 pm
BOI
- STL
1 stop6h 44m
Hawaiian Airlines
Deal found 2/28![Hawaiian Airlines logo]()
$250
This Delta deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 3/256:29 am
STL
- JAC
1 stop7h 06m
Delta
Mon 3/305:50 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 3/2![Delta logo]()
$257
This United Airlines deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/118:54 am
STL
- JAC
1 stop5h 27m
United Airlines
Tue 4/142:35 pm
JAC
- STL
1 stop5h 19m
United Airlines
Deal found 2/27![United Airlines logo]()
$274
This Delta deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/142:20 pm
STL
- BOI
2 stops10h 57m
Delta
Tue 4/215:40 am
BOI
- STL
2 stops10h 46m
Delta
Deal found 2/28![Delta logo]()
$274
This Delta deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 4/17:15 am
STL
- JAC
1 stop5h 55m
Delta
Mon 4/65:50 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 3/2![Delta logo]()
$277
This Delta deal was found by Cheapflights users on 2/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/172:22 pm
STL
- JAC
1 stop5h 40m
Delta
Tue 3/245:50 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 2/26![Delta logo]()
$278
This Delta deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/32:12 pm
STL
- BOI
2 stops8h 52m
Delta
Wed 4/81:45 pm
BOI
- STL
2 stops9h 36m
Delta
Deal found 2/27![Delta logo]()
$280
This Delta deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/52:12 pm
STL
- BOI
2 stops10h 34m
Delta
Sat 4/116:00 am
BOI
- STL
1 stop7h 43m
Delta
Deal found 2/27![Delta logo]()
$281
This Southwest deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/148:25 am
STL
- BOI
2 stops9h 00m
Southwest
Tue 4/212:00 pm
BOI
- STL
1 stop7h 00m
Southwest
Deal found 2/28![Southwest logo]()
$282
This Delta deal was found by Cheapflights users on 2/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/232:15 pm
STL
- JAC
1 stop5h 50m
Delta
Mon 10/265:30 pm
JAC
- STL
1 stop6h 06m
Delta
Deal found 2/26![Delta logo]()
$299
This Delta deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 5/56:00 am
STL
- JAC
2 stops11h 13m
Delta
Tue 5/1211:35 am
JAC
- STL
1 stop6h 28m
Delta
Deal found 3/2![Delta logo]()
$304
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 March 2, 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 March 2, 2026.
This Delta deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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 3/317:15 am
STL
- JAC
1 stop5h 55m
Delta
Tue 4/75:50 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 3/1![Delta logo]()
$257
This United Airlines deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/95:10 am
STL
- IDA
1 stop5h 40m
United Airlines
Mon 6/152:30 pm
IDA
- STL
1 stop5h 13m
United Airlines
Deal found 2/27![United Airlines logo]()
$312
This Alaska Airlines deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/177:00 am
STL
- BOI
1 stop9h 29m
Alaska Airlines
Mon 4/277:20 pm
BOI
- STL
1 stop27h 39m
Alaska Airlines
Deal found 2/28![Alaska Airlines logo]()
$365
This Southwest deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/255:00 pm
STL
- GEG
2 stops9h 10m
Southwest
Sun 3/297:15 pm
GEG
- STL
1 stop12h 35m
Southwest
Deal found 2/28![Southwest logo]()
$423
This Kiwi.com deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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.
Sun 3/294:51 pm
STL
- GEG
2 stops19h 34m
Multiple Airlines
Sun 4/511:06 am
GEG
- STL
1 stop20h 42m
Multiple Airlines
Deal found 3/1![Multiple Airlines logo]()
$464
This American Airlines deal was found by Cheapflights users on 2/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/37:15 am
STL
- IDA
1 stop6h 58m
American Airlines
Sat 8/87:00 am
IDA
- STL
1 stop6h 43m
American Airlines
Deal found 2/26![American Airlines logo]()
$505
This Delta deal was found by Cheapflights users on 2/25. 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.
Wed 3/2510:12 am
STL
- JAC
2 stops9h 50m
Delta
Wed 4/15:50 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 2/25![Delta logo]()
$262
This Delta deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/142:20 pm
STL
- BOI
2 stops10h 57m
Delta
Tue 4/215:40 am
BOI
- STL
2 stops10h 46m
Delta
Deal found 2/28![Delta logo]()
$274
This Delta deal was found by Cheapflights users on 2/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/172:22 pm
STL
- JAC
1 stop5h 40m
Delta
Tue 3/245:50 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 2/26![Delta logo]()
$278
This United Airlines deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 3/319:10 am
STL
- IDA
2 stops12h 52m
United Airlines
Sat 4/42:30 pm
IDA
- STL
1 stop5h 24m
United Airlines
Deal found 3/2![United Airlines logo]()
$339
This Alaska Airlines deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/205:33 pm
STL
- BOI
1 stop24h 40m
Alaska Airlines
Thu 5/289:00 am
BOI
- STL
1 stop6h 37m
Alaska Airlines
Deal found 3/2![Alaska Airlines logo]()
$387
This Delta deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/52:12 pm
STL
- BOI
2 stops10h 34m
Delta
Sat 4/116:00 am
BOI
- STL
1 stop7h 43m
Delta
Deal found 2/28![Delta logo]()
$301
This United Airlines deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/27:45 am
STL
- IDA
2 stops8h 58m
United Airlines
Sat 5/92:31 pm
IDA
- STL
1 stop5h 12m
United Airlines
Deal found 2/27![United Airlines logo]()
$372
This Southwest deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/185:15 pm
STL
- GEG
2 stops9h 20m
Southwest
Thu 5/211:30 pm
GEG
- STL
2 stops8h 45m
Southwest
Deal found 2/27![Southwest logo]()
$435
This United Airlines deal was found by Cheapflights users on 2/25. 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.
Sat 6/275:10 am
STL
- IDA
1 stop5h 40m
United Airlines
Sat 7/44:10 pm
IDA
- STL
1 stop6h 47m
United Airlines
Deal found 2/25![United Airlines logo]()
$375
This Alaska Airlines deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/243:50 pm
STL
- GEG
1 stop9h 20m
Alaska Airlines
Thu 3/265:00 am
GEG
- STL
1 stop16h 59m
Alaska Airlines
Deal found 2/28![Alaska Airlines logo]()
$415
This Southwest deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/245:35 pm
STL
- GEG
2 stops8h 35m
Southwest
Thu 3/265:55 am
GEG
- STL
2 stops8h 10m
Southwest
Deal found 2/28![Southwest logo]()
$445
This Delta deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 3/2510:12 am
STL
- JAC
2 stops9h 50m
Delta
Mon 3/305:50 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 3/2![Delta logo]()
$343
This United Airlines deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/249:00 am
STL
- GEG
2 stops14h 03m
United Airlines
Thu 3/261:37 pm
GEG
- STL
1 stop7h 57m
United Airlines
Deal found 2/28![United Airlines logo]()
$390
This Alaska Airlines deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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 8/35:33 pm
STL
- IDA
1 stop20h 33m
Alaska Airlines
Sat 8/84:14 pm
IDA
- STL
1 stop23h 19m
Alaska Airlines
Deal found 3/1![Alaska Airlines logo]()
$459
This Southwest deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/176:15 am
STL
- GEG
1 stop5h 40m
Southwest
Thu 5/215:50 am
GEG
- STL
1 stop8h 05m
Southwest
Deal found 2/27![Southwest logo]()
$470
This Delta deal was found by Cheapflights users on 2/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/153:11 pm
STL
- JAC
1 stop6h 04m
Delta
Mon 5/185:59 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 2/26![Delta logo]()
$389
This Alaska Airlines deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/215:33 pm
STL
- GEG
1 stop7h 33m
Alaska Airlines
Mon 5/2512:36 pm
GEG
- STL
1 stop26h 01m
Alaska Airlines
Deal found 3/1![Alaska Airlines logo]()
$481
This Delta deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/153:11 pm
STL
- JAC
1 stop6h 04m
Delta
Thu 5/215:59 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 2/28![Delta logo]()
$389
This Alaska Airlines deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/265:33 pm
STL
- IDA
1 stop20h 33m
Alaska Airlines
Sun 8/24:14 pm
IDA
- STL
1 stop23h 19m
Alaska Airlines
Deal found 2/27![Alaska Airlines logo]()
$499
This Delta deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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 5/14:41 pm
STL
- BOI
1 stop6h 47m
Delta
Mon 5/410:45 am
BOI
- STL
1 stop5h 41m
Delta
Deal found 3/1![Delta logo]()
$398
This United Airlines deal was found by Cheapflights users on 2/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/155:59 pm
STL
- JAC
1 stop16h 43m
United Airlines
Mon 5/184:15 pm
JAC
- STL
2 stops27h 58m
United Airlines
Deal found 2/26![United Airlines logo]()
$541
This Delta deal was found by Cheapflights users on 2/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/62:22 pm
STL
- JAC
1 stop5h 42m
Delta
Tue 3/105:50 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 2/26![Delta logo]()
$399
This United Airlines deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/66:25 am
STL
- JAC
2 stops9h 51m
United Airlines
Tue 3/101:33 pm
JAC
- STL
2 stops9h 01m
United Airlines
Deal found 2/28![United Airlines logo]()
$545
This Delta deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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 5/82:27 pm
STL
- PIH
1 stop4h 55m
Delta
Sun 5/107:00 pm
PIH
- STL
1 stop4h 30m
Delta
Deal found 3/1![Delta logo]()
$427
Last-minute flights from St. Louis to IdahoDiscover last-minute flight deals from St. Louis to Idaho. Data last updated March 2, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Idaho. Data last updated March 2, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/148:12 pm
STL
- BOI
1 stop16h 08m
Frontier
Sun 3/2212:15 pm
BOI
- STL
1 stop20h 34m
Frontier
Deal found 3/2![Frontier logo]()
$326
This Delta deal was found by Cheapflights users on 2/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/172:22 pm
STL
- JAC
1 stop5h 40m
Delta
Tue 3/245:50 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 2/26![Delta logo]()
$278
This United Airlines deal was found by Cheapflights users on 2/25. 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.
Wed 3/255:15 am
STL
- JAC
1 stop5h 36m
United Airlines
Wed 4/12:35 pm
JAC
- STL
1 stop5h 19m
United Airlines
Deal found 2/25![United Airlines logo]()
$249
This Delta deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 3/256:29 am
STL
- JAC
1 stop7h 06m
Delta
Mon 3/305:50 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 3/2![Delta logo]()
$257
This American Airlines deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/256:00 am
STL
- GEG
1 stop7h 44m
American Airlines
Sun 3/2911:59 pm
GEG
- STL
1 stop9h 00m
American Airlines
Deal found 2/28![American Airlines logo]()
$342
This Delta deal was found by Cheapflights users on 2/25. 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.
Wed 3/2510:12 am
STL
- JAC
2 stops9h 50m
Delta
Wed 4/11:10 pm
JAC
- STL
2 stops9h 48m
Delta
Deal found 2/25![Delta logo]()
$379
This United Airlines deal was found by Cheapflights users on 2/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/285:15 am
STL
- BOI
1 stop5h 51m
United Airlines
Sat 4/46:15 am
BOI
- STL
1 stop5h 53m
United Airlines
Deal found 2/26![United Airlines logo]()
$317
This United Airlines deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 3/319:10 am
STL
- IDA
2 stops12h 52m
United Airlines
Sat 4/42:30 pm
IDA
- STL
1 stop5h 24m
United Airlines
Deal found 3/2![United Airlines logo]()
$339
This Delta deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 3/316:12 pm
STL
- IDA
1 stop5h 04m
Delta
Sat 4/41:10 pm
IDA
- STL
1 stop7h 21m
Delta
Deal found 3/2![Delta logo]()
$385
This Delta deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 4/17:15 am
STL
- JAC
1 stop5h 55m
Delta
Mon 4/65:50 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 3/2![Delta logo]()
$277
This United Airlines deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/118:54 am
STL
- JAC
1 stop5h 27m
United Airlines
Tue 4/142:35 pm
JAC
- STL
1 stop5h 19m
United Airlines
Deal found 2/27![United Airlines logo]()
$274
This Delta deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/232:20 pm
STL
- JAC
1 stop5h 41m
Delta
Thu 4/305:11 pm
JAC
- STL
1 stop6h 14m
Delta
Deal found 2/27![Delta logo]()
$299
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 March 2, 2026.
Search for one-way flight options from St. Louis to Idaho. Find affordable one-way fares based on user searches. Data last updated March 2, 2026.
This Trip.com deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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 4/258:17 pm
STL
- GEG
1 stop16h 32m
Frontier
Deal found 3/1![Frontier logo]()
$104
This CheapOair deal was found by Cheapflights users on 2/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/148:12 pm
STL
- BOI
1 stop16h 08m
Frontier
Deal found 2/26![Frontier logo]()
$147
This Kiwi.com deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 5/88:12 pm
STL
- GEG
2 stops50h 17m
Multiple Airlines
Deal found 3/2![Multiple Airlines logo]()
$172
This United Airlines deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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 4/2511:15 am
STL
- GEG
2 stops12h 20m
United Airlines
Deal found 3/1![United Airlines logo]()
$184
This Kiwi.com deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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 3/78:12 pm
STL
- BOI
1 stop15h 08m
Frontier
Deal found 3/1![Frontier logo]()
$184
This Alaska Airlines deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/205:33 pm
STL
- BOI
1 stop24h 40m
Alaska Airlines
Deal found 3/1![Alaska Airlines logo]()
$187
This United Airlines deal was found by Cheapflights users on 3/1. Clicking the “Pick Dates” 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 4/242:40 pm
STL
- GEG
1 stop8h 31m
United Airlines
Deal found 3/1![United Airlines logo]()
$199
This American Airlines deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/207:05 am
STL
- BOI
1 stop6h 44m
American Airlines
Deal found 2/28![American Airlines logo]()
$200
This American Airlines deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/296:00 am
STL
- GEG
1 stop7h 44m
American Airlines
Deal found 2/28![American Airlines logo]()
$204
This United Airlines deal was found by Cheapflights users on 3/2. Clicking the “Pick Dates” 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 3/115:15 am
STL
- IDA
1 stop5h 41m
United Airlines
Deal found 3/2![United Airlines logo]()
$205
This Southwest deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/15:45 am
STL
- GEG
2 stops10h 50m
Southwest
Deal found 2/28![Southwest logo]()
$209
This Trip.com deal was found by Cheapflights users on 2/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/118:16 pm
STL
- GEG
1 stop16h 05m
Frontier
Deal found 2/26![Frontier logo]()
$219
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 March 2, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $250 (Kiwi.com) |
One-way from | $104 (Trip.com) |
Popular in | February |
Cheapest in | January |
Average price | $425 |
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 2,558,603 searches. Data last updated March 2, 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
St. LouisJackson
STL - JAC
STLJAC
Lambert-St Louis
Tue 3/31
7:15 am-12:10 pm
1 stop5h 55m
Jackson Hole
Tue 4/7
5:50 pm-12:21 am
1 stop5h 31m
$257
St. LouisJackson
STL - JAC
STLJAC
Lambert-St Louis
Wed 3/25
10:12 am-7:02 pm
2 stops9h 50m
Jackson Hole
Wed 4/1
5:50 pm-12:21 am
1 stop5h 31m
$262
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Tue 4/14
2:20 pm-12:17 am
2 stops10h 57m
Boise Air Term. Gowen Fld
Tue 4/21
5:40 am-5:26 pm
2 stops10h 46m
$274
St. LouisJackson
STL - JAC
STLJAC
Lambert-St Louis
Tue 3/17
2:22 pm-7:02 pm
1 stop5h 40m
Jackson Hole
Tue 3/24
5:50 pm-12:21 am
1 stop5h 31m
$278
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Sun 4/5
2:12 pm-11:46 pm
2 stops10h 34m
Boise Air Term. Gowen Fld
Sat 4/11
6:00 am-2:43 pm
1 stop7h 43m
$301
St. LouisIdaho Falls
STL - IDA
STLIDA
Lambert-St Louis
Tue 6/9
5:10 am-9:50 am
1 stop5h 40m
Idaho Falls Fanning Field
Mon 6/15
2:30 pm-8:43 pm
1 stop5h 13m
$312
St. LouisIdaho Falls
STL - IDA
STLIDA
Lambert-St Louis
Tue 3/31
9:10 am-9:02 pm
2 stops12h 52m
Idaho Falls Fanning Field
Sat 4/4
2:30 pm-8:54 pm
1 stop5h 24m
$339
St. LouisJackson
STL - JAC
STLJAC
Lambert-St Louis
Wed 3/25
10:12 am-7:02 pm
2 stops9h 50m
Jackson Hole
Mon 3/30
5:50 pm-12:21 am
1 stop5h 31m
$343
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Fri 4/17
7:00 am-3:29 pm
1 stop9h 29m
Boise Air Term. Gowen Fld
Mon 4/27
7:20 pm-11:59 pm
1 stop27h 39m
$365
St. LouisIdaho Falls
STL - IDA
STLIDA
Lambert-St Louis
Sat 5/2
7:45 am-3:43 pm
2 stops8h 58m
Idaho Falls Fanning Field
Sat 5/9
2:31 pm-8:43 pm
1 stop5h 12m
$372
Showing 1-10 of 60 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-GEG
STL-BOI
STL-IDA
STL-JAC
STL-PIH
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-GEG
STL-BOI
STL-IDA
STL-JAC
What is the cheapest month to book a flight from St. Louis to Idaho?
Currently, September is the cheapest month in which you can book a flight from St. Louis to Idaho (average of $186). Flying from St. Louis to Idaho in February is currently the most expensive (average of $380). 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.
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 March 2, 2026.
Peruse reviews from past customers who have flown with Southwest, Delta, and United 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.
Comfort
8.0
Food
7.0
Entertainment
7.5
Crew
8.6
Overall
8.0
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentAnonymous,Feb 2026
DEN - BDL
Comfort
8.0
Food
7.0
Entertainment
7.5
Crew
8.6
Overall
8.0
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentAnonymous,Feb 2026
DEN - BDL
Comfort
8.0
Food
7.0
Entertainment
7.5
Crew
8.6
Overall
8.0
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentAnonymous,Feb 2026
DEN - BDL
Comfort
8.0
Food
7.0
Entertainment
7.5
Crew
8.6
Overall
8.0
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentAnonymous,Feb 2026
DEN - BDL
Comfort
8.0
Food
7.0
Entertainment
7.5
Crew
8.6
Overall
8.0
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentAnonymous,Feb 2026
DEN - BDL
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
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St. Louis and Idaho flights
Browse other St. Louis and Idaho flight options. Last updated on March 2, 2026.
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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 2,558,603 searches. Data last updated March 2, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$163 | Average$373 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$186 | Average$366 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$290 | Average$448 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$292 | Average$421 | FlexibilityNo cancel fee | On-time63% |