$119+ 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 3/7. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BOI
Mar 13 — Mar 201
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
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
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from St. Louis to Idaho
Cheapest
Best
Last-minute
One-way
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 11, 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 11, 2026.
This CheapOair deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/254:51 pm
STL
- BOI
1 stop20h 00m
Frontier
Sun 3/111:56 am
BOI
- STL
1 stop24h 13m
Frontier
Deal found 2/10![Frontier logo]()
$222
This Delta deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure 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 2/9![Delta logo]()
$257
This Alaska Airlines deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/37:00 am
STL
- GEG
1 stop7h 29m
Alaska Airlines
Wed 3/45:40 am
GEG
- STL
1 stop6h 11m
Alaska Airlines
Deal found 2/8![Alaska Airlines logo]()
$272
This CheapOair deal was found by Cheapflights users on 2/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/317:00 am
STL
- BOI
1 stop9h 29m
Alaska Airlines
Tue 4/74:15 pm
BOI
- STL
1 stop6h 44m
Alaska Airlines
Deal found 2/11![Alaska Airlines logo]()
$277
This Delta deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/56:29 am
STL
- BOI
1 stop8h 36m
Delta
Sat 4/1112:45 pm
BOI
- STL
1 stop7h 46m
Delta
Deal found 2/9![Delta logo]()
$281
This Delta deal was found by Cheapflights users on 2/10. 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.
Tue 3/103:05 pm
STL
- BOI
1 stop7h 04m
Delta
Tue 3/175:30 am
BOI
- STL
1 stop5h 18m
Delta
Deal found 2/10![Delta logo]()
$287
This Expedia deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/57:00 am
STL
- GEG
1 stop9h 36m
Multiple Airlines
Sun 3/812:40 pm
GEG
- STL
1 stop7h 22m
Multiple Airlines
Deal found 2/9![Multiple Airlines logo]()
$289
This United Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/265:15 am
STL
- JAC
1 stop5h 48m
United Airlines
Sat 8/18:00 am
JAC
- STL
1 stop8h 53m
United Airlines
Deal found 2/9![United Airlines logo]()
$299
This United Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/66:05 pm
STL
- BOI
1 stop5h 38m
United Airlines
Tue 3/102:40 pm
BOI
- STL
1 stop5h 01m
United Airlines
Deal found 2/9![United Airlines logo]()
$301
This United Airlines deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/249:55 am
STL
- JAC
2 stops12h 04m
United Airlines
Sat 2/287:00 am
JAC
- STL
1 stop5h 14m
United Airlines
Deal found 2/8![United Airlines logo]()
$304
This Delta deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/52:22 pm
STL
- BOI
2 stops10h 23m
Delta
Wed 3/1110:35 am
BOI
- STL
1 stop5h 32m
Delta
Deal found 2/8![Delta logo]()
$316
This United Airlines deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/37:41 am
STL
- GEG
2 stops9h 35m
United Airlines
Wed 3/44:02 pm
GEG
- STL
1 stop5h 19m
United Airlines
Deal found 2/8![United Airlines logo]()
$322
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 11, 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 11, 2026.
This Delta deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/47:15 am
STL
- JAC
1 stop5h 55m
Delta
Mon 4/65:50 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 2/8![Delta logo]()
$257
This Alaska Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/37:00 am
STL
- GEG
1 stop7h 29m
Alaska Airlines
Wed 3/45:40 am
GEG
- STL
1 stop6h 11m
Alaska Airlines
Deal found 2/7![Alaska Airlines logo]()
$272
This CheapOair deal was found by Cheapflights users on 2/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/18:16 pm
STL
- BOI
1 stop15h 52m
Frontier
Sun 4/512:03 pm
BOI
- STL
1 stop20h 45m
Frontier
Deal found 2/11![Frontier logo]()
$281
This United Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/66:05 pm
STL
- BOI
1 stop5h 38m
United Airlines
Tue 3/102:40 pm
BOI
- STL
1 stop5h 01m
United Airlines
Deal found 2/9![United Airlines logo]()
$301
This American Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/196:50 pm
STL
- GEG
1 stop7h 33m
American Airlines
Sun 3/2211:59 pm
GEG
- STL
1 stop6h 56m
American Airlines
Deal found 2/9![American Airlines logo]()
$357
This Expedia deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/67:58 am
STL
- GEG
2 stops12h 14m
Multiple Airlines
Sun 3/812:40 pm
GEG
- STL
1 stop7h 22m
Multiple Airlines
Deal found 2/9![Multiple Airlines logo]()
$379
This Delta deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/256:00 am
STL
- JAC
1 stop8h 30m
Delta
Mon 3/305:50 pm
JAC
- STL
1 stop5h 31m
Delta
Deal found 2/8![Delta logo]()
$257
This United Airlines deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/249:55 am
STL
- JAC
2 stops12h 04m
United Airlines
Sat 2/287:00 am
JAC
- STL
1 stop5h 14m
United Airlines
Deal found 2/8![United Airlines logo]()
$304
This Delta deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/56:12 pm
STL
- BOI
1 stop6h 47m
Delta
Sat 4/118:00 am
BOI
- STL
1 stop5h 43m
Delta
Deal found 2/8![Delta logo]()
$281
This Delta deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/86:12 pm
STL
- BOI
1 stop4h 59m
Delta
Tue 3/105:30 am
BOI
- STL
1 stop7h 54m
Delta
Deal found 2/7![Delta logo]()
$281
This United Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/39:55 am
STL
- GEG
2 stops13h 22m
United Airlines
Wed 3/41:44 pm
GEG
- STL
1 stop7h 37m
United Airlines
Deal found 2/7![United Airlines logo]()
$322
This American Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/66:00 am
STL
- GEG
1 stop7h 44m
American Airlines
Sun 3/811:59 pm
GEG
- STL
1 stop6h 56m
American Airlines
Deal found 2/9![American Airlines logo]()
$357
This United Airlines deal was found by Cheapflights users on 2/10. 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 3/245:15 am
STL
- IDA
1 stop5h 41m
United Airlines
Tue 3/312:30 pm
IDA
- STL
1 stop5h 24m
United Airlines
Deal found 2/10![United Airlines logo]()
$339
This Delta deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/117:15 am
STL
- JAC
1 stop5h 55m
Delta
Sat 3/141:10 pm
JAC
- STL
1 stop7h 21m
Delta
Deal found 2/9![Delta logo]()
$329
This United Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/38:41 am
STL
- IDA
1 stop5h 49m
United Airlines
Wed 3/42:40 pm
IDA
- STL
1 stop7h 41m
United Airlines
Deal found 2/7![United Airlines logo]()
$341
This United Airlines deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/175:15 am
STL
- IDA
1 stop5h 40m
United Airlines
Sat 6/206:03 pm
IDA
- STL
1 stop4h 55m
United Airlines
Deal found 2/8![United Airlines logo]()
$358
This United Airlines deal was found by Cheapflights users on 2/11. 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.
Mon 8/35:15 am
STL
- IDA
1 stop5h 40m
United Airlines
Sat 8/82:31 pm
IDA
- STL
1 stop5h 11m
United Airlines
Deal found 2/11![United Airlines logo]()
$383
This Delta deal was found by Cheapflights users on 2/10. 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 2/262:22 pm
STL
- LWS
2 stops8h 30m
Delta
Mon 3/212:24 pm
LWS
- STL
2 stops9h 12m
Delta
Deal found 2/10![Delta logo]()
$579
This Delta deal was found by Cheapflights users on 2/11. 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.
Mon 8/35:30 pm
STL
- PIH
2 stops25h 55m
Delta
Sat 8/87:00 pm
PIH
- STL
2 stops13h 30m
Delta
Deal found 2/11![Delta logo]()
$587
This Delta deal was found by Cheapflights users on 2/11. 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.
Mon 8/35:30 pm
STL
- PIH
2 stops25h 55m
Delta
Sun 8/97:00 pm
PIH
- STL
1 stop4h 36m
Delta
Deal found 2/11![Delta logo]()
$667
This United Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/131:38 pm
STL
- WYS
1 stop24h 42m
United Airlines
Mon 7/202:02 pm
WYS
- STL
2 stops21h 09m
United Airlines
Deal found 2/9![United Airlines logo]()
$772
This Delta deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/67:00 am
STL
- LWS
1 stop6h 35m
Delta
Sun 3/812:10 pm
LWS
- STL
2 stops9h 15m
Delta
Deal found 2/9![Delta logo]()
$829
This Delta deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/257:00 am
STL
- LWS
1 stop6h 35m
Delta
Sun 3/112:24 pm
LWS
- STL
2 stops8h 59m
Delta
Deal found 2/9![Delta logo]()
$929
Last-minute flights from St. Louis to IdahoDiscover last-minute flight deals from St. Louis to Idaho. Data last updated February 11, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Idaho. Data last updated February 11, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/249:55 am
STL
- JAC
2 stops12h 04m
United Airlines
Sat 2/287:00 am
JAC
- STL
1 stop5h 14m
United Airlines
Deal found 2/8![United Airlines logo]()
$304
This CheapOair deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/254:51 pm
STL
- BOI
1 stop20h 00m
Frontier
Sun 3/111:56 am
BOI
- STL
1 stop24h 13m
Frontier
Deal found 2/10![Frontier logo]()
$222
This Alaska Airlines deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/37:00 am
STL
- GEG
1 stop7h 29m
Alaska Airlines
Wed 3/45:40 am
GEG
- STL
1 stop6h 11m
Alaska Airlines
Deal found 2/8![Alaska Airlines logo]()
$272
This United Airlines deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/37:41 am
STL
- GEG
2 stops9h 35m
United Airlines
Wed 3/44:02 pm
GEG
- STL
1 stop5h 19m
United Airlines
Deal found 2/8![United Airlines logo]()
$322
This Expedia deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/57:00 am
STL
- GEG
1 stop9h 36m
Multiple Airlines
Sun 3/812:40 pm
GEG
- STL
1 stop7h 22m
Multiple Airlines
Deal found 2/9![Multiple Airlines logo]()
$289
This Delta deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/52:22 pm
STL
- BOI
2 stops10h 23m
Delta
Wed 3/1110:35 am
BOI
- STL
1 stop5h 32m
Delta
Deal found 2/8![Delta logo]()
$316
This United Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/66:05 pm
STL
- BOI
1 stop5h 38m
United Airlines
Tue 3/102:40 pm
BOI
- STL
1 stop5h 01m
United Airlines
Deal found 2/9![United Airlines logo]()
$301
This Delta deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/86:12 pm
STL
- BOI
1 stop4h 59m
Delta
Tue 3/105:30 am
BOI
- STL
1 stop7h 54m
Delta
Deal found 2/7![Delta logo]()
$281
This Delta deal was found by Cheapflights users on 2/10. 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.
Tue 3/103:05 pm
STL
- BOI
1 stop7h 04m
Delta
Tue 3/175:30 am
BOI
- STL
1 stop5h 18m
Delta
Deal found 2/10![Delta logo]()
$287
This Delta deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure 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 2/9![Delta logo]()
$257
This CheapOair deal was found by Cheapflights users on 2/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/317:00 am
STL
- BOI
1 stop9h 29m
Alaska Airlines
Tue 4/74:15 pm
BOI
- STL
1 stop6h 44m
Alaska Airlines
Deal found 2/11![Alaska Airlines logo]()
$277
This Southwest deal was found by Cheapflights users on 2/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/315:00 pm
STL
- BOI
2 stops8h 30m
Southwest
Tue 4/72:00 pm
BOI
- STL
1 stop7h 00m
Southwest
Deal found 2/11![Southwest logo]()
$323
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 11, 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 11, 2026.
This Delta deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/77:00 am
STL
- GEG
1 stop7h 07m
Delta
Deal found 2/8![Delta logo]()
$119
This American Airlines deal was found by Cheapflights users on 2/11. 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 3/109:35 am
STL
- GEG
1 stop9h 19m
American Airlines
Deal found 2/11![American Airlines logo]()
$139
This United Airlines deal was found by Cheapflights users on 2/11. 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.
Tue 3/1010:00 am
STL
- GEG
2 stops13h 03m
United Airlines
Deal found 2/11![United Airlines logo]()
$144
This American Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/96:00 am
STL
- GEG
1 stop7h 44m
American Airlines
Deal found 2/9![American Airlines logo]()
$146
This United Airlines deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/710:00 am
STL
- GEG
2 stops13h 18m
United Airlines
Deal found 2/8![United Airlines logo]()
$149
This American Airlines deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/94:13 pm
STL
- BOI
1 stop7h 10m
American Airlines
Deal found 2/8![American Airlines logo]()
$163
This Delta deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/107:59 pm
STL
- GEG
1 stop5h 36m
Delta
Deal found 2/8![Delta logo]()
$164
This Delta deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/122:27 pm
STL
- GEG
2 stops10h 30m
Delta
Deal found 2/8![Delta logo]()
$177
This American Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/75:45 am
STL
- BOI
1 stop6h 44m
American Airlines
Deal found 2/9![American Airlines logo]()
$184
This United Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/55:15 am
STL
- IDA
1 stop5h 40m
United Airlines
Deal found 2/9![United Airlines logo]()
$192
This United Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/910:00 am
STL
- GEG
2 stops13h 18m
United Airlines
Deal found 2/9![United Airlines logo]()
$194
This American Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/207:05 am
STL
- BOI
1 stop6h 44m
American Airlines
Deal found 2/9![American Airlines logo]()
$194
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 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $222 (CheapOair) |
One-way from | $119 (Delta) |
Popular in | February |
Cheapest in | November |
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 11, 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
Sat 4/4
7:15 am-12:10 pm
1 stop5h 55m
Jackson Hole
Mon 4/6
5:50 pm-12:21 am
1 stop5h 31m
$257
St. LouisJackson
STL - JAC
STLJAC
Lambert-St Louis
Wed 3/25
6:00 am-1:30 pm
1 stop8h 30m
Jackson Hole
Mon 3/30
5:50 pm-12:21 am
1 stop5h 31m
$257
St. LouisSpokane
STL - GEG
STLGEG
Lambert-St Louis
Tue 3/3
7:00 am-12:29 pm
1 stop7h 29m
Spokane
Wed 3/4
5:40 am-1:51 pm
1 stop6h 11m
$272
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Wed 4/1
8:16 pm-11:08 am
1 stop15h 52m
Boise Air Term. Gowen Fld
Sun 4/5
12:03 pm-9:48 am
1 stop20h 45m
$281
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Sun 4/5
6:12 pm-11:59 pm
1 stop6h 47m
Boise Air Term. Gowen Fld
Sat 4/11
8:00 am-2:43 pm
1 stop5h 43m
$281
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Sun 3/8
6:12 pm-10:11 pm
1 stop4h 59m
Boise Air Term. Gowen Fld
Tue 3/10
5:30 am-2:24 pm
1 stop7h 54m
$281
St. LouisBoise
STL - BOI
STLBOI
Lambert-St Louis
Fri 3/6
6:05 pm-10:43 pm
1 stop5h 38m
Boise Air Term. Gowen Fld
Tue 3/10
2:40 pm-8:41 pm
1 stop5h 01m
$301
St. LouisJackson
STL - JAC
STLJAC
Lambert-St Louis
Tue 2/24
9:55 am-8:59 pm
2 stops12h 04m
Jackson Hole
Sat 2/28
7:00 am-1:14 pm
1 stop5h 14m
$304
St. LouisSpokane
STL - GEG
STLGEG
Lambert-St Louis
Tue 3/3
9:55 am-9:17 pm
2 stops13h 22m
Spokane
Wed 3/4
1:44 pm-11:21 pm
1 stop7h 37m
$322
St. LouisJackson
STL - JAC
STLJAC
Lambert-St Louis
Wed 3/11
7:15 am-12:10 pm
1 stop5h 55m
Jackson Hole
Sat 3/14
1:10 pm-9:31 pm
1 stop7h 21m
$329
Showing 1-10 of 46 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-GEG
STL-BOI
STL-IDA
STL-JAC
STL-WYS
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 February 11, 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.
Crew
8.6
Boarding
8.1
Overall
8.0
Entertainment
7.5
Food
7.0
Comfort
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Boarding
8.1
Overall
8.0
Entertainment
7.5
Food
7.0
Comfort
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Boarding
8.1
Overall
8.0
Entertainment
7.5
Food
7.0
Comfort
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Boarding
8.1
Overall
8.0
Entertainment
7.5
Food
7.0
Comfort
8.0
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Boarding
8.1
Overall
8.0
Entertainment
7.5
Food
7.0
Comfort
8.0
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.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Popular flights
Top destinations
Alternative routes for St. Louis to Idaho
See prices for flight routes from nearby airports that may be better suited for you.
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 February 11, 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 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$163 | Average$378 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$186 | Average$366 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$290 | Average$486 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$296 | Average$421 | FlexibilityNo cancel fee | On-time63% |