$145+ Cheap flights from Idaho to St. Louis (STL)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/1. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — STL
Oct 15 — Oct 221
Round-trip
1 adult, Economy
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Find cheap flights from Idaho to St. Louis 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 Idaho to St. Louis
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Cheapest flights from Idaho to St. LouisExplore the most affordable flight options available from Idaho to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2026.
Explore the most affordable flight options available from Idaho to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2026.
This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/263:24 pm -
1 stop7h 55m
Wed 10/285:40 am -
1 stop9h 11m
Deal found 9/14![American Airlines logo]()
$288
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/96:00 am -
1 stop5h 36m
Wed 12/167:08 am -
1 stop7h 13m
Deal found 9/14![Delta logo]()
$305
This Southwest deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/91:35 pm -
1 stop5h 30m
Tue 12/156:30 am -
1 stop5h 45m
Deal found 9/14![Southwest logo]()
$306
This Southwest deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/91:35 pm -
1 stop5h 30m
Wed 12/166:25 am -
2 stops9h 05m
Deal found 9/15![Southwest logo]()
$310
This Southwest deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/264:05 pm -
2 stops7h 35m
Wed 10/284:05 pm -
2 stops8h 10m
Deal found 9/14![Southwest logo]()
$320
This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/162:41 pm -
1 stop6h 18m
Mon 10/195:40 am -
1 stop6h 44m
Deal found 9/14![American Airlines logo]()
$325
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/281:54 pm -
1 stop7h 27m
Mon 11/25:00 pm -
1 stop7h 11m
Deal found 9/14![Delta logo]()
$327
This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/262:08 pm -
1 stop8h 11m
Sat 10/315:40 am -
2 stops9h 49m
Deal found 9/14![American Airlines logo]()
$332
This Southwest deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/2611:25 am -
2 stops10h 30m
Sat 10/3111:20 am -
2 stops9h 20m
Deal found 9/14![Southwest logo]()
$338
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/301:54 pm -
1 stop7h 27m
Tue 11/37:45 am -
1 stop6h 34m
Deal found 9/14![Delta logo]()
$348
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/297:00 am -
1 stop5h 45m
Sat 10/317:45 am -
1 stop6h 34m
Deal found 9/14![Delta logo]()
$349
This United Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/295:00 am -
2 stops8h 43m
Mon 11/24:39 pm -
1 stop6h 32m
Deal found 9/14![United Airlines logo]()
$354
Best flights from Idaho to St. LouisDiscover carefully curated flight deals from Idaho to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 15, 2026.
Discover carefully curated flight deals from Idaho to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 15, 2026.
This Alaska Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/284:18 pm -
1 stop6h 41m
Thu 10/297:02 am -
1 stop9h 21m
Deal found 9/14![Alaska Airlines logo]()
$288
This American Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/62:08 pm -
1 stop8h 11m
Sat 10/105:00 am -
1 stop8h 50m
Deal found 9/15![American Airlines logo]()
$305
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/91:44 pm -
1 stop5h 44m
Tue 12/153:32 pm -
1 stop6h 46m
Deal found 9/15![Delta logo]()
$305
This Southwest deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/91:35 pm -
1 stop5h 30m
Wed 12/166:25 am -
2 stops9h 05m
Deal found 9/15![Southwest logo]()
$310
This United Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/295:51 pm -
1 stop4h 53m
Sat 10/38:00 am -
2 stops8h 24m
Deal found 9/14![United Airlines logo]()
$404
This Southwest deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/96:05 am -
2 stops10h 30m
Tue 12/156:30 am -
2 stops8h 20m
Deal found 9/14![Southwest logo]()
$317
This American Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1012:49 pm -
1 stop7h 10m
Sat 10/175:40 am -
2 stops9h 49m
Deal found 9/11![American Airlines logo]()
$375
This Alaska Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/316:09 am -
1 stop8h 35m
Wed 11/47:00 am -
1 stop9h 18m
Deal found 9/10![Alaska Airlines logo]()
$399
This United Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/99:00 am -
2 stops11h 59m
Tue 12/159:40 am -
2 stops10h 13m
Deal found 9/15![United Airlines logo]()
$405
This Southwest deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/105:35 am -
2 stops13h 30m
Thu 12/175:05 am -
2 stops8h 25m
Deal found 9/15![Southwest logo]()
$385
This Delta deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/115:37 pm -
1 stop6h 07m
Sat 10/177:45 am -
1 stop5h 23m
Deal found 9/11![Delta logo]()
$445
This United Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/302:28 pm -
1 stop5h 08m
Sun 10/45:10 am -
1 stop5h 43m
Deal found 9/14![United Airlines logo]()
$407
This American Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/201:42 pm -
1 stop8h 07m
Tue 11/246:00 am -
1 stop8h 20m
Deal found 9/15![American Airlines logo]()
$421
This Southwest deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2212:00 pm -
2 stops8h 45m
Mon 10/264:50 pm -
2 stops9h 15m
Deal found 9/13![Southwest logo]()
$416
This Alaska Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/262:01 pm -
1 stop23h 20m
Wed 9/303:19 pm -
1 stop8h 37m
Deal found 9/11![Alaska Airlines logo]()
$459
This United Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/312:35 pm -
1 stop5h 24m
Wed 11/49:40 am -
2 stops12h 29m
Deal found 9/10![United Airlines logo]()
$424
This American Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/112:03 pm -
2 stops8h 30m
Sun 12/136:00 am -
1 stop6h 29m
Deal found 9/11![American Airlines logo]()
$464
This United Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/99:00 am -
2 stops11h 59m
Wed 12/169:40 am -
2 stops10h 13m
Deal found 9/15![United Airlines logo]()
$428
This Alaska Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/97:00 am -
2 stops11h 42m
Wed 12/168:10 am -
2 stops12h 30m
Deal found 9/11![Alaska Airlines logo]()
$479
This Southwest deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/196:15 pm -
2 stops15h 10m
Thu 10/225:10 am -
2 stops8h 30m
Deal found 9/14![Southwest logo]()
$459
This Southwest deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/72:25 pm -
1 stop8h 30m
Mon 10/126:20 pm -
1 stop7h 45m
Deal found 9/13![Southwest logo]()
$489
This Alaska Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/237:37 pm -
1 stop18h 19m
Tue 1/263:54 pm -
2 stops23h 17m
Deal found 9/14![Alaska Airlines logo]()
$543
This United Airlines deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/102:38 pm -
1 stop4h 58m
Sat 10/1710:27 am -
2 stops11h 48m
Deal found 9/12![United Airlines logo]()
$537
This Southwest deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1110:30 am -
2 stops11h 05m
Sun 12/138:35 am -
2 stops8h 30m
Deal found 9/11![Southwest logo]()
$500
This United Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/52:40 pm -
1 stop5h 19m
Tue 2/99:13 am -
1 stop5h 16m
Deal found 9/10![United Airlines logo]()
$539
This Southwest deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/912:45 pm -
2 stops9h 45m
Mon 10/126:20 pm -
1 stop7h 45m
Deal found 9/14![Southwest logo]()
$532
This United Airlines deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/286:30 am -
1 stop5h 08m
Thu 10/296:00 am -
2 stops13h 03m
Deal found 9/12![United Airlines logo]()
$544
This United Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/237:00 am -
1 stop4h 43m
Tue 1/263:00 pm -
1 stop7h 11m
Deal found 9/10![United Airlines logo]()
$565
This Delta deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/256:04 am -
2 stops7h 37m
Wed 12/210:04 am -
2 stops12h 42m
Deal found 9/11![Delta logo]()
$1,107
This United Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/114:28 pm -
1 stop6h 16m
Sat 10/1711:35 am -
2 stops10h 38m
Deal found 9/11![United Airlines logo]()
$671
Last-minute flights from Idaho to St. LouisDiscover last-minute flight deals from Idaho to St. Louis. Data last updated September 15, 2026 and is based on user searches.
Discover last-minute flight deals from Idaho to St. Louis. Data last updated September 15, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/62:08 pm -
1 stop8h 11m
Thu 10/156:32 am -
1 stop7h 27m
Deal found 9/11![American Airlines logo]()
$369
This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/162:41 pm -
1 stop6h 18m
Mon 10/195:40 am -
1 stop6h 44m
Deal found 9/14![American Airlines logo]()
$325
This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/263:24 pm -
1 stop7h 55m
Wed 10/285:40 am -
1 stop9h 11m
Deal found 9/14![American Airlines logo]()
$288
This Southwest deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/264:05 pm -
2 stops7h 35m
Wed 10/284:05 pm -
2 stops8h 10m
Deal found 9/14![Southwest logo]()
$320
This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/262:08 pm -
1 stop8h 11m
Sat 10/315:40 am -
2 stops9h 49m
Deal found 9/14![American Airlines logo]()
$332
This Southwest deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/2611:25 am -
2 stops10h 30m
Sat 10/3111:20 am -
2 stops9h 20m
Deal found 9/14![Southwest logo]()
$338
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/285:04 pm -
1 stop5h 40m
Tue 11/35:00 pm -
1 stop7h 11m
Deal found 9/14![Delta logo]()
$305
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/281:54 pm -
1 stop7h 27m
Mon 11/25:00 pm -
1 stop7h 11m
Deal found 9/14![Delta logo]()
$327
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/296:00 am -
1 stop5h 32m
Mon 11/25:00 pm -
1 stop7h 11m
Deal found 9/14![Delta logo]()
$349
This United Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/295:00 am -
2 stops8h 43m
Mon 11/24:39 pm -
1 stop6h 32m
Deal found 9/14![United Airlines logo]()
$354
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/301:54 pm -
1 stop7h 27m
Tue 11/37:45 am -
1 stop6h 34m
Deal found 9/14![Delta logo]()
$348
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/306:00 am -
1 stop5h 32m
Sat 10/317:45 am -
1 stop6h 34m
Deal found 9/14![Delta logo]()
$370
One-way flights from Idaho to St. LouisSearch for one-way flight options from Idaho to St. Louis. Find affordable one-way fares based on user searches. Data last updated September 15, 2026.
Search for one-way flight options from Idaho to St. Louis. Find affordable one-way fares based on user searches. Data last updated September 15, 2026.
This Trip.com deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/12:50 pm -
1 stop19h 27m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![Frontier logo]()
$145
This American Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/92:13 pm -
1 stop7h 46m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![American Airlines logo]()
$153
This CheapOair deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/82:50 pm -
1 stop20h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$170
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/106:50 am -
1 stop7h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Delta logo]()
$175
This Delta deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/125:04 pm -
1 stop5h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![Delta logo]()
$185
This Southwest deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/96:40 am -
2 stops8h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/12![Southwest logo]()
$190
This American Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/86:15 am -
2 stops11h 07m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![American Airlines logo]()
$203
This Priceline deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/266:02 am -
1 stop7h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/11![Alaska Airlines logo]()
$210
This Delta deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/261:11 pm -
2 stops8h 42m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/11![Delta logo]()
$213
This Delta deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/255:15 am -
1 stop6h 02m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/11![Delta logo]()
$219
This United Airlines deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/268:15 am -
1 stop8h 44m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/11![United Airlines logo]()
$221
This Kiwi.com deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/122:50 pm -
2 stops47h 34m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![Frontier logo]()
$222
Find flight deals from Idaho to St. Louis
Keep the following information in mind while searching for Idaho to St. Louis flight deals. Data was last updated September 15, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $288 (American Airlines) |
One-way from | $145 (Trip.com) |
Popular in | May |
Cheapest in | April |
Average price | $479 |
Cheapflights Fare Finder
Customize your flight search to find flights from Idaho to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated September 15, 2026.
Use the filters below to find and compare flights from Idaho to St. Louis that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
BoiseSt. Louis
BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis
BOISTL
Boise Air Term. Gowen Fld
Thu 10/1
2:50 pm-11:17 am
1 stop19h 27m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$145
SpokaneSt. Louis
GEG Spokane - STL Lambert-St Louis
GEGSTL
Spokane
Tue 12/8
6:01 am-4:40 pm
1 stop8h 39m
Lambert-St Louis
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$153
SpokaneSt. Louis
GEG Spokane - STL Lambert-St Louis
GEGSTL
Spokane
Wed 12/9
2:13 pm-11:59 pm
1 stop7h 46m
Lambert-St Louis
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$153
BoiseSt. Louis
BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis
BOISTL
Boise Air Term. Gowen Fld
Thu 10/8
2:50 pm-12:35 pm
1 stop20h 45m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$170
SpokaneSt. Louis
GEG Spokane - STL Lambert-St Louis
GEGSTL
Spokane
Thu 12/10
6:50 am-4:30 pm
1 stop7h 40m
Lambert-St Louis
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$175
Quickest round-trip
SpokaneSt. Louis
GEG Spokane - STL Lambert-St Louis
GEGSTL
Spokane
Wed 12/16
1:35 pm-9:05 pm
1 stop5h 30m
Lambert-St Louis
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$185
SpokaneSt. Louis
GEG Spokane - STL Lambert-St Louis
GEGSTL
Spokane
Wed 12/9
2:15 pm-11:05 pm
1 stop6h 50m
Lambert-St Louis
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$185
SpokaneSt. Louis
GEG Spokane - STL Lambert-St Louis
GEGSTL
Spokane
Mon 10/12
5:04 pm-12:44 am
1 stop5h 40m
Lambert-St Louis
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$185
Idaho FallsSt. Louis
IDA Idaho Falls Fanning Field - STL Lambert-St Louis
IDASTL
Idaho Falls Fanning Field
Thu 11/26
6:02 am-2:22 pm
1 stop7h 20m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$210
Idaho FallsSt. Louis
IDA Idaho Falls Fanning Field - STL Lambert-St Louis
IDASTL
Idaho Falls Fanning Field
Thu 11/26
1:11 pm-10:53 pm
2 stops8h 42m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$213
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Idaho to St. Louis
Have a flexible travel schedule? Discover the best time to fly to St. Louis from Idaho with our price prediction graph.
BOI-STL
GEG-STL
SUN-STL
TWF-STL
IDA-STL
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Idaho to St. Louis
USID-STL
BOI-STL
GEG-STL
SUN-STL
TWF-STL
What is the cheapest month to book a flight from Idaho to St. Louis?
Currently, January is the cheapest month in which you can book a flight from Idaho to St. Louis (average of $440). Flying from Idaho to St. Louis in February is currently the most expensive (average of $837). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
How much does it cost to fly round-trip from Idaho to St. Louis?
Airfare is below average for this route at the moment.
Idaho to St. Louis flights typically cost between $444 and $562 in November.The cheapest round-trip price found within the last 5 days was $264 on Southwest (Nov 3-Nov 10).
Related info for your journey
Find useful and relevant information for your journey from Idaho to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsFairview Heights
O'Fallon
Fenton
Swansea
Eureka
Maryland Heights
Collinsville
Wentzville
Edwardsville
Glencoe
Chesterfield
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for Idaho to St. Louis
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Complete your trip
Complete your trip to St. Louis by adding a car rental and/or hotel reservation to your travel itinerary.
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Idaho and St. Louis flights
Browse other Idaho and St. Louis flight options. Last updated on September 15, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to St. Louis
Explore flights to St. Louis departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 15, 2026.
Idaho to St. Louis flights
Consider these flights traveling from Idaho to St. Louis.
Top 4 airlines flying from Idaho to St. Louis
Discover the top 4 airlines that operate flights from Idaho to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated September 15, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$164 | Average$458 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$328 | Average$687 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$355 | Average$526 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$355 | Average$493 | FlexibilityNo cancel fee | On-time69% |