$138+ 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 4/23. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BOI
Mar 27 — Apr 31
1 adult, Economy
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Find cheap flights from St. Louis to Idaho with Cheapflights
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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 February 25, 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 February 25, 2026.
This Delta deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/256:29 am
STL
- JAC
1 stop7h 06m
Delta
Mon 3/305:50 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 2/24![Delta logo]()
$257
This Trip.com deal was found by Cheapflights users on 2/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/73:50 pm
STL
- GEG
1 stop9h 20m
Multiple Airlines
Tue 4/142:47 pm
GEG
- STL
1 stop7h 12m
Multiple Airlines
Deal found 2/21![Multiple Airlines logo]()
$262
This Delta deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/92:12 pm
STL
- JAC
1 stop5h 50m
Delta
Thu 4/165:11 pm
JAC
- STL
1 stop6h 14m
Delta
Deal found 2/23![Delta logo]()
$268
This Delta deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/52:12 pm
STL
- BOI
2 stops8h 52m
Delta
Sat 4/116:00 am
BOI
- STL
1 stop7h 43m
Delta
Deal found 2/24![Delta logo]()
$272
This Trip.com deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/94:20 pm
STL
- BOI
1 stop7h 37m
Multiple Airlines
Thu 4/1611:53 am
BOI
- STL
1 stop6h 28m
Multiple Airlines
Deal found 2/23![Multiple Airlines logo]()
$273
This Delta deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/92:12 pm
STL
- BOI
2 stops8h 52m
Delta
Thu 4/161:52 pm
BOI
- STL
2 stops9h 33m
Delta
Deal found 2/23![Delta logo]()
$276
This Delta deal was found by Cheapflights users on 2/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/215:29 pm
STL
- GEG
1 stop6h 00m
Delta
Wed 3/251:50 pm
GEG
- STL
1 stop8h 31m
Delta
Deal found 2/22![Delta logo]()
$277
This Delta deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/237:00 am
STL
- JAC
1 stop6h 04m
Delta
Sun 4/265:11 pm
JAC
- STL
1 stop6h 14m
Delta
Deal found 2/24![Delta logo]()
$279
This Delta deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/232:15 pm
STL
- JAC
1 stop5h 50m
Delta
Mon 10/265:30 pm
JAC
- STL
1 stop6h 06m
Delta
Deal found 2/23![Delta logo]()
$289
This Delta deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/166:45 pm
STL
- BOI
1 stop6h 12m
Delta
Mon 4/201:52 pm
BOI
- STL
2 stops9h 33m
Delta
Deal found 2/23![Delta logo]()
$289
This Delta deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/16:45 pm
STL
- BOI
1 stop6h 12m
Delta
Wed 5/68:30 am
BOI
- STL
1 stop7h 56m
Delta
Deal found 2/23![Delta logo]()
$294
This Delta deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/256:00 am
STL
- GEG
1 stop7h 37m
Delta
Sat 4/187:15 am
GEG
- STL
2 stops12h 16m
Delta
Deal found 2/23![Delta logo]()
$295
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 February 25, 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 February 25, 2026.
This Delta deal was found by Cheapflights users on 2/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/107:15 am
STL
- JAC
1 stop5h 55m
Delta
Sun 4/125:50 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 2/21![Delta logo]()
$257
This Alaska Airlines deal was found by Cheapflights users on 2/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/177:00 am
STL
- BOI
1 stop16h 57m
Alaska Airlines
Mon 4/276:08 pm
BOI
- STL
1 stop28h 51m
Alaska Airlines
Deal found 2/22![Alaska Airlines logo]()
$353
This Southwest deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/195:35 am
STL
- GEG
1 stop7h 00m
Southwest
Tue 4/217:00 am
GEG
- STL
2 stops8h 55m
Southwest
Deal found 2/23![Southwest logo]()
$355
This United Airlines deal was found by Cheapflights users on 2/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/239:10 am
STL
- JAC
2 stops12h 43m
United Airlines
Thu 4/3010:35 am
JAC
- STL
1 stop5h 22m
United Airlines
Deal found 2/21![United Airlines logo]()
$364
This flugladen.de deal was found by Cheapflights users on 2/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/83:50 pm
STL
- IDA
1 stop8h 02m
Hawaiian Airlines
Wed 4/156:00 am
IDA
- STL
1 stop7h 51m
Hawaiian Airlines
Deal found 2/22![Hawaiian Airlines logo]()
$431
This Delta deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/257:03 am
STL
- JAC
1 stop7h 27m
Delta
Mon 3/305:50 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 2/23![Delta logo]()
$257
This Alaska Airlines deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/245:33 pm
STL
- IDA
1 stop20h 44m
Alaska Airlines
Fri 5/294:03 pm
IDA
- STL
1 stop23h 34m
Alaska Airlines
Deal found 2/24![Alaska Airlines logo]()
$359
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.
Fri 4/172:20 pm
STL
- BOI
2 stops9h 04m
Delta
Mon 4/278:30 am
BOI
- STL
1 stop7h 56m
Delta
Deal found 2/25![Delta logo]()
$340
This United Airlines deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/35:10 am
STL
- IDA
1 stop5h 40m
United Airlines
Sat 8/85:54 pm
IDA
- STL
1 stop5h 03m
United Airlines
Deal found 2/23![United Airlines logo]()
$399
This United Airlines deal was found by Cheapflights users on 2/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/239:23 am
STL
- JAC
2 stops9h 31m
United Airlines
Tue 5/264:23 pm
JAC
- STL
1 stop6h 34m
United Airlines
Deal found 2/22![United Airlines logo]()
$414
This Alaska Airlines deal was found by Cheapflights users on 2/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/197:56 pm
STL
- BOI
1 stop14h 47m
Alaska Airlines
Sun 6/218:28 pm
BOI
- STL
1 stop19h 05m
Alaska Airlines
Deal found 2/22![Alaska Airlines logo]()
$419
This Delta deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/52:12 pm
STL
- BOI
2 stops10h 34m
Delta
Sat 4/119:00 am
BOI
- STL
2 stops11h 31m
Delta
Deal found 2/23![Delta logo]()
$390
This Southwest deal was found by Cheapflights users on 2/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/216:00 am
STL
- GEG
2 stops10h 45m
Southwest
Wed 3/257:00 am
GEG
- STL
2 stops9h 25m
Southwest
Deal found 2/22![Southwest logo]()
$487
This United Airlines deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/209:23 am
STL
- JAC
2 stops9h 30m
United Airlines
Fri 7/248:00 am
JAC
- STL
1 stop9h 17m
United Airlines
Deal found 2/24![United Airlines logo]()
$429
This Delta deal was found by Cheapflights users on 2/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/16:45 pm
STL
- BOI
1 stop6h 12m
Delta
Mon 5/46:16 pm
BOI
- STL
1 stop5h 09m
Delta
Deal found 2/21![Delta logo]()
$394
This Alaska Airlines deal was found by Cheapflights users on 2/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/36:20 pm
STL
- BOI
2 stops19h 08m
Alaska Airlines
Sat 8/86:20 am
BOI
- STL
1 stop6h 42m
Alaska Airlines
Deal found 2/21![Alaska Airlines logo]()
$448
This Delta deal was found by Cheapflights users on 2/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/152:27 pm
STL
- JAC
1 stop8h 02m
Delta
Mon 5/185:59 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 2/21![Delta logo]()
$409
This United Airlines deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/56:00 am
STL
- BOI
1 stop6h 32m
United Airlines
Thu 7/95:00 am
BOI
- STL
2 stops9h 46m
United Airlines
Deal found 2/23![United Airlines logo]()
$456
This Southwest deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/215:45 am
STL
- GEG
2 stops9h 05m
Southwest
Mon 5/255:50 am
GEG
- STL
2 stops13h 05m
Southwest
Deal found 2/23![Southwest logo]()
$566
This Delta deal was found by Cheapflights users on 2/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/152:27 pm
STL
- JAC
1 stop8h 02m
Delta
Thu 5/215:59 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 2/21![Delta logo]()
$409
This Alaska Airlines deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/277:00 am
STL
- GEG
1 stop27h 45m
Alaska Airlines
Mon 3/305:00 am
GEG
- STL
1 stop8h 20m
Alaska Airlines
Deal found 2/23![Alaska Airlines logo]()
$495
This United Airlines deal was found by Cheapflights users on 2/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/246:00 am
STL
- IDA
2 stops10h 34m
United Airlines
Fri 5/295:54 pm
IDA
- STL
1 stop5h 03m
United Airlines
Deal found 2/21![United Airlines logo]()
$460
This Delta deal was found by Cheapflights users on 2/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/201:30 pm
STL
- BOI
1 stop10h 08m
Delta
Fri 7/2411:30 pm
BOI
- STL
1 stop9h 10m
Delta
Deal found 2/22![Delta logo]()
$411
This Alaska Airlines deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/74:46 pm
STL
- IDA
1 stop23h 43m
Alaska Airlines
Mon 5/114:06 pm
IDA
- STL
1 stop6h 53m
Alaska Airlines
Deal found 2/24![Alaska Airlines logo]()
$499
This United Airlines deal was found by Cheapflights users on 2/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/89:23 am
STL
- JAC
2 stops9h 30m
United Airlines
Sat 8/157:00 am
JAC
- STL
1 stop8h 35m
United Airlines
Deal found 2/22![United Airlines logo]()
$495
This Delta deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/247:15 am
STL
- IDA
1 stop6h 12m
Delta
Tue 3/311:10 pm
IDA
- STL
2 stops9h 48m
Delta
Deal found 2/24![Delta logo]()
$428
This Southwest deal was found by Cheapflights users on 2/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/46:20 am
STL
- GEG
2 stops9h 05m
Southwest
Mon 3/912:55 pm
GEG
- STL
2 stops9h 55m
Southwest
Deal found 2/22![Southwest logo]()
$695
This Alaska Airlines deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/35:33 pm
STL
- IDA
1 stop20h 33m
Alaska Airlines
Sat 8/84:14 pm
IDA
- STL
2 stops20h 41m
Alaska Airlines
Deal found 2/24![Alaska Airlines logo]()
$546
This United Airlines deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/106:25 am
STL
- IDA
2 stops8h 05m
United Airlines
Sat 3/146:36 am
IDA
- STL
2 stops8h 47m
United Airlines
Deal found 2/23![United Airlines logo]()
$507
This Alaska Airlines deal was found by Cheapflights users on 2/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/95:33 pm
STL
- IDA
2 stops23h 04m
Alaska Airlines
Sat 6/131:43 pm
IDA
- STL
2 stops25h 50m
Alaska Airlines
Deal found 2/21![Alaska Airlines logo]()
$554
Last-minute flights from St. Louis to IdahoDiscover last-minute flight deals from St. Louis to Idaho. Data last updated February 25, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Idaho. Data last updated February 25, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 2/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/246:00 am
STL
- JAC
1 stop8h 25m
Delta
Sun 3/15:15 pm
JAC
- STL
1 stop6h 10m
Delta
Deal found 2/21![Delta logo]()
$419
This Delta deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/62:22 pm
STL
- JAC
1 stop5h 42m
Delta
Tue 3/105:50 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 2/24![Delta logo]()
$349
This United Airlines deal was found by Cheapflights users on 2/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/67:41 am
STL
- JAC
2 stops8h 35m
United Airlines
Mon 3/94:16 pm
JAC
- STL
1 stop6h 18m
United Airlines
Deal found 2/21![United Airlines logo]()
$404
This United Airlines deal was found by Cheapflights users on 2/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/65:15 am
STL
- JAC
1 stop5h 36m
United Airlines
Tue 3/101:33 pm
JAC
- STL
2 stops9h 01m
United Airlines
Deal found 2/22![United Airlines logo]()
$434
This Delta deal was found by Cheapflights users on 2/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/96:12 pm
STL
- IDA
1 stop5h 04m
Delta
Fri 3/136:55 pm
IDA
- STL
1 stop4h 26m
Delta
Deal found 2/21![Delta logo]()
$420
This United Airlines deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/105:15 am
STL
- IDA
1 stop5h 41m
United Airlines
Sat 3/142:35 pm
IDA
- STL
1 stop5h 10m
United Airlines
Deal found 2/23![United Airlines logo]()
$387
This American Airlines deal was found by Cheapflights users on 2/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/196:00 am
STL
- GEG
1 stop7h 44m
American Airlines
Sun 3/2211:59 pm
GEG
- STL
1 stop6h 56m
American Airlines
Deal found 2/21![American Airlines logo]()
$349
This American Airlines deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/205:12 am
STL
- JAC
1 stop8h 26m
American Airlines
Wed 3/253:06 pm
JAC
- STL
1 stop6h 52m
American Airlines
Deal found 2/24![American Airlines logo]()
$279
This Delta deal was found by Cheapflights users on 2/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/215:29 pm
STL
- GEG
1 stop6h 00m
Delta
Wed 3/251:50 pm
GEG
- STL
1 stop8h 31m
Delta
Deal found 2/22![Delta logo]()
$277
This Delta deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/247:15 am
STL
- IDA
1 stop6h 12m
Delta
Tue 3/316:55 pm
IDA
- STL
1 stop4h 26m
Delta
Deal found 2/24![Delta logo]()
$325
This Delta deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/257:15 am
STL
- JAC
1 stop5h 55m
Delta
Mon 3/305:50 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 2/24![Delta logo]()
$257
This Delta deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/256:00 am
STL
- GEG
1 stop7h 37m
Delta
Sat 4/187:15 am
GEG
- STL
2 stops12h 16m
Delta
Deal found 2/23![Delta logo]()
$295
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 February 25, 2026.
Search for one-way flight options from St. Louis to Idaho. Find affordable one-way fares based on user searches. Data last updated February 25, 2026.
This Delta deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/232:20 pm
STL
- GEG
2 stops8h 42m
Delta
Deal found 2/23![Delta logo]()
$138
This American Airlines deal was found by Cheapflights users on 2/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/125:51 am
STL
- GEG
1 stop8h 32m
American Airlines
Deal found 2/22![American Airlines logo]()
$139
This Delta deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/236:12 pm
STL
- IDA
1 stop5h 04m
Delta
Deal found 2/23![Delta logo]()
$140
This United Airlines deal was found by Cheapflights users on 2/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/129:14 am
STL
- GEG
2 stops14h 02m
United Airlines
Deal found 2/22![United Airlines logo]()
$144
This Alaska Airlines deal was found by Cheapflights users on 2/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/235:33 pm
STL
- JAC
1 stop20h 58m
Alaska Airlines
Deal found 2/22![Alaska Airlines logo]()
$145
This Trip.com deal was found by Cheapflights users on 2/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com 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 2/22![Frontier logo]()
$145
This Alaska Airlines deal was found by Cheapflights users on 2/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/155:33 pm
STL
- JAC
2 stops22h 34m
Alaska Airlines
Deal found 2/21![Alaska Airlines logo]()
$151
This Trip.com deal was found by Cheapflights users on 2/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/78:12 pm
STL
- GEG
1 stop15h 35m
Frontier
Deal found 2/21![Frontier logo]()
$153
This Delta deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/247:15 am
STL
- IDA
1 stop6h 12m
Delta
Deal found 2/23![Delta logo]()
$155
This Kiwi.com deal was found by Cheapflights users on 2/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/43:49 pm
STL
- GEG
2 stops21h 38m
Frontier
Deal found 2/21![Frontier logo]()
$162
This American Airlines deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/235:51 am
STL
- GEG
1 stop8h 41m
American Airlines
Deal found 2/23![American Airlines logo]()
$164
This United Airlines deal was found by Cheapflights users on 2/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/165:55 pm
STL
- BOI
1 stop5h 48m
United Airlines
Deal found 2/21![United Airlines logo]()
$164
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 February 25, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $257 (Delta) |
One-way from | $138 (Delta) |
Popular in | February |
Cheapest in | January |
Average price | $566 |
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 February 25, 2026.
Use the filters below to find and compare flights from St. Louis to Idaho that are best for you.
Fly from
St. Louis
Fly to
Idaho
Route
Depart
Return
Price
St. LouisJackson
STL - JAC
STLJAC
Lambert-St Louis
Fri 4/10
7:15 am-12:10 pm
1 stop5h 55m
Jackson Hole
Sun 4/12
5:50 pm-12:21 am
1 stop5h 31m
$257
St. LouisJackson
STL - JAC
STLJAC
Lambert-St Louis
Wed 3/25
7:03 am-1:30 pm
1 stop7h 27m
Jackson Hole
Mon 3/30
5:50 pm-12:21 am
1 stop5h 31m
$257
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Fri 4/17
2:20 pm-10:24 pm
2 stops9h 04m
Boise Air Term. Gowen Fld
Mon 4/27
8:30 am-5:26 pm
1 stop7h 56m
$340
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Fri 4/17
7:00 am-10:57 pm
1 stop16h 57m
Boise Air Term. Gowen Fld
Mon 4/27
6:08 pm-11:59 pm
1 stop28h 51m
$353
St. LouisSpokane
STL - GEG
STLGEG
Lambert-St Louis
Sun 4/19
5:35 am-10:35 am
1 stop7h 00m
Spokane
Tue 4/21
7:00 am-5:55 pm
2 stops8h 55m
$355
St. LouisIdaho Falls
STL - IDA
STLIDA
Lambert-St Louis
Sun 5/24
5:33 pm-1:17 pm
1 stop20h 44m
Idaho Falls Fanning Field
Fri 5/29
4:03 pm-4:37 pm
1 stop23h 34m
$359
St. LouisJackson
STL - JAC
STLJAC
Lambert-St Louis
Thu 4/23
9:10 am-8:53 pm
2 stops12h 43m
Jackson Hole
Thu 4/30
10:35 am-4:57 pm
1 stop5h 22m
$364
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
9:00 am-9:31 pm
2 stops11h 31m
$390
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Fri 5/1
6:45 pm-11:57 pm
1 stop6h 12m
Boise Air Term. Gowen Fld
Mon 5/4
6:16 pm-12:25 am
1 stop5h 09m
$394
St. LouisIdaho Falls
STL - IDA
STLIDA
Lambert-St Louis
Mon 8/3
5:10 am-9:50 am
1 stop5h 40m
Idaho Falls Fanning Field
Sat 8/8
5:54 pm-11:57 pm
1 stop5h 03m
$399
Showing 1-10 of 60 results
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-JAC
STL-GEG
STL-IDA
STL-BOI
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-JAC
STL-GEG
STL-IDA
STL-BOI
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 February 25, 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.
Overall
8.0
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Overall
8.0
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Crew
8.6
Food
7.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
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.
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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 February 25, 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 2,558,603 searches. Data last updated February 25, 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$449 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$292 | Average$421 | FlexibilityNo cancel fee | On-time63% |