$95+ Cheap flights from Idaho to St. Louis (STL)
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 4/30. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — STL
Mar 6 — Mar 131
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
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
Cheapest
Best
Last-minute
One-way
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 February 4, 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 February 4, 2026.
This Delta deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 2/2812:59 pm
BOI
- STL
1 stop7h 39m
Delta
Sat 3/77:00 am
STL
- BOI
1 stop6h 09m
Delta
Deal found 2/3![Delta logo]()
$237
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/32:40 pm
BOI
- STL
1 stop4h 46m
United Airlines
Tue 3/106:25 am
STL
- BOI
2 stops8h 07m
United Airlines
Deal found 2/2![United Airlines logo]()
$242
This Delta deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/2510:40 pm
GEG
- STL
1 stop8h 25m
Delta
Mon 3/306:00 am
STL
- GEG
1 stop7h 37m
Delta
Deal found 2/4![Delta logo]()
$262
This American Airlines deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 3/36:00 am
GEG
- STL
1 stop7h 28m
American Airlines
Thu 3/56:00 am
STL
- GEG
1 stop7h 44m
American Airlines
Deal found 2/3![American Airlines logo]()
$264
This Delta deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/306:55 pm
IDA
- STL
1 stop4h 26m
Delta
Sat 4/47:15 am
STL
- IDA
1 stop6h 12m
Delta
Deal found 2/1![Delta logo]()
$279
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/252:40 pm
BOI
- STL
1 stop4h 46m
United Airlines
Mon 3/24:30 pm
STL
- BOI
1 stop6h 02m
United Airlines
Deal found 2/2![United Airlines logo]()
$281
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/22:15 pm
GEG
- STL
1 stop7h 10m
Delta
Tue 4/73:05 pm
STL
- GEG
1 stop8h 24m
Delta
Deal found 2/2![Delta logo]()
$282
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/310:41 am
BOI
- STL
2 stops11h 42m
Delta
Tue 3/103:05 pm
STL
- BOI
2 stops9h 39m
Delta
Deal found 2/2![Delta logo]()
$293
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/162:25 pm
BOI
- STL
1 stop7h 56m
Delta
Tue 5/198:53 am
STL
- BOI
1 stop5h 26m
Delta
Deal found 2/2![Delta logo]()
$294
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/255:20 am
BOI
- STL
1 stop8h 34m
Delta
Mon 3/22:22 pm
STL
- BOI
2 stops10h 23m
Delta
Deal found 2/2![Delta logo]()
$295
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/162:25 pm
BOI
- STL
1 stop7h 56m
Delta
Mon 5/186:20 am
STL
- BOI
1 stop7h 59m
Delta
Deal found 2/2![Delta logo]()
$308
This Expedia deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/16:00 am
IDA
- STL
1 stop7h 51m
Alaska Airlines
Mon 4/67:00 am
STL
- IDA
1 stop10h 19m
Alaska Airlines
Deal found 2/1![Alaska Airlines logo]()
$308
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 February 4, 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 February 4, 2026.
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/32:40 pm
BOI
- STL
1 stop4h 46m
United Airlines
Tue 3/104:30 pm
STL
- BOI
1 stop7h 13m
United Airlines
Deal found 2/2![United Airlines logo]()
$237
This Delta deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 2/2812:59 pm
BOI
- STL
1 stop7h 39m
Delta
Sat 3/77:00 am
STL
- BOI
1 stop6h 09m
Delta
Deal found 2/3![Delta logo]()
$237
This American Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/312:25 pm
GEG
- STL
1 stop6h 47m
American Airlines
Thu 3/56:00 am
STL
- GEG
1 stop7h 44m
American Airlines
Deal found 2/2![American Airlines logo]()
$264
This CheapOair deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/242:22 pm
BOI
- STL
1 stop8h 37m
Alaska Airlines
Mon 3/304:20 pm
STL
- BOI
1 stop7h 37m
Alaska Airlines
Deal found 2/2![Alaska Airlines logo]()
$281
This Delta deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 3/255:00 pm
GEG
- STL
1 stop5h 21m
Delta
Mon 3/306:29 am
STL
- GEG
1 stop8h 41m
Delta
Deal found 2/3![Delta logo]()
$262
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/252:40 pm
BOI
- STL
1 stop4h 46m
United Airlines
Mon 3/24:30 pm
STL
- BOI
1 stop6h 02m
United Airlines
Deal found 2/2![United Airlines logo]()
$281
This Delta deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 3/241:50 pm
GEG
- STL
1 stop8h 31m
Delta
Mon 3/306:00 am
STL
- GEG
1 stop7h 37m
Delta
Deal found 2/3![Delta logo]()
$262
This Expedia deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/16:00 am
IDA
- STL
1 stop7h 51m
Alaska Airlines
Mon 4/67:00 am
STL
- IDA
1 stop10h 19m
Alaska Airlines
Deal found 2/1![Alaska Airlines logo]()
$308
This Delta deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/306:55 pm
IDA
- STL
1 stop4h 26m
Delta
Sat 4/47:15 am
STL
- IDA
1 stop6h 12m
Delta
Deal found 2/1![Delta logo]()
$279
This United Airlines deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 6/46:03 pm
IDA
- STL
1 stop4h 55m
United Airlines
Mon 6/85:15 am
STL
- IDA
1 stop5h 40m
United Airlines
Deal found 2/3![United Airlines logo]()
$337
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/162:25 pm
BOI
- STL
1 stop7h 56m
Delta
Tue 5/193:59 pm
STL
- BOI
2 stops8h 56m
Delta
Deal found 2/2![Delta logo]()
$285
This Travelocity deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/151:04 pm
JAC
- STL
1 stop9h 55m
Alaska Airlines
Thu 2/197:00 am
STL
- JAC
1 stop29h 08m
Alaska Airlines
Deal found 2/4![Alaska Airlines logo]()
$354
This United Airlines deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/182:35 pm
IDA
- STL
1 stop5h 06m
United Airlines
Sun 3/225:15 am
STL
- IDA
1 stop5h 41m
United Airlines
Deal found 2/4![United Airlines logo]()
$354
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/310:41 am
BOI
- STL
2 stops11h 42m
Delta
Tue 3/103:05 pm
STL
- BOI
2 stops9h 39m
Delta
Deal found 2/2![Delta logo]()
$293
This American Airlines deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 2/141:08 pm
JAC
- STL
1 stop5h 34m
American Airlines
Thu 2/197:00 am
STL
- JAC
1 stop8h 26m
American Airlines
Deal found 2/3![American Airlines logo]()
$429
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/255:20 am
BOI
- STL
1 stop8h 34m
Delta
Mon 3/22:22 pm
STL
- BOI
2 stops10h 23m
Delta
Deal found 2/2![Delta logo]()
$295
This United Airlines deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 2/262:40 pm
JAC
- STL
1 stop4h 46m
United Airlines
Mon 3/28:41 am
STL
- JAC
1 stop5h 40m
United Airlines
Deal found 2/3![United Airlines logo]()
$379
This Expedia deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/165:20 pm
IDA
- STL
1 stop19h 31m
Alaska Airlines
Fri 3/207:00 am
STL
- IDA
1 stop11h 19m
Alaska Airlines
Deal found 2/1![Alaska Airlines logo]()
$419
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/2410:35 am
BOI
- STL
2 stops12h 46m
Delta
Mon 3/302:12 pm
STL
- BOI
2 stops10h 33m
Delta
Deal found 2/2![Delta logo]()
$303
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/262:05 pm
GEG
- STL
1 stop7h 18m
Delta
Sun 3/16:40 pm
STL
- GEG
1 stop7h 14m
Delta
Deal found 2/2![Delta logo]()
$309
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/194:16 pm
JAC
- STL
1 stop6h 18m
United Airlines
Mon 3/239:00 am
STL
- JAC
1 stop5h 21m
United Airlines
Deal found 2/2![United Airlines logo]()
$429
This Alaska Airlines deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 6/46:00 am
IDA
- STL
1 stop8h 50m
Alaska Airlines
Mon 6/86:20 pm
STL
- IDA
2 stops29h 25m
Alaska Airlines
Deal found 2/3![Alaska Airlines logo]()
$485
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/2711:30 pm
BOI
- STL
1 stop8h 32m
Delta
Sun 3/296:12 pm
STL
- BOI
1 stop4h 59m
Delta
Deal found 2/2![Delta logo]()
$325
This Delta deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” 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 3/1612:35 pm
GEG
- STL
1 stop9h 23m
Delta
Thu 3/199:45 am
STL
- GEG
1 stop5h 25m
Delta
Deal found 2/4![Delta logo]()
$327
This Delta deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” 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 3/202:15 pm
GEG
- STL
1 stop7h 10m
Delta
Mon 3/306:00 am
STL
- GEG
1 stop7h 37m
Delta
Deal found 2/4![Delta logo]()
$327
This United Airlines deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/3010:40 am
IDA
- STL
2 stops9h 28m
United Airlines
Sat 4/47:45 am
STL
- IDA
2 stops9h 29m
United Airlines
Deal found 2/1![United Airlines logo]()
$589
This American Airlines deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/177:40 am
SUN
- STL
2 stops15h 19m
American Airlines
Sat 2/216:38 am
STL
- SUN
2 stops16h 24m
American Airlines
Deal found 2/1![American Airlines logo]()
$1,046
This Delta deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 2/145:15 pm
JAC
- STL
1 stop6h 10m
Delta
Thu 2/196:35 am
STL
- JAC
2 stops10h 44m
Delta
Deal found 2/3![Delta logo]()
$484
This Delta deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/15:45 am
IDA
- STL
2 stops7h 39m
Delta
Mon 4/62:12 pm
STL
- IDA
1 stop5h 03m
Delta
Deal found 2/1![Delta logo]()
$520
This Delta deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 2/203:44 pm
TWF
- STL
1 stop7h 41m
Delta
Fri 2/276:40 pm
STL
- TWF
1 stop5h 07m
Delta
Deal found 2/3![Delta logo]()
$527
Last-minute flights from Idaho to St. LouisDiscover last-minute flight deals from Idaho to St. Louis. Data last updated February 4, 2026 and is based on user searches.
Discover last-minute flight deals from Idaho to St. Louis. Data last updated February 4, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/252:40 pm
BOI
- STL
1 stop4h 46m
United Airlines
Mon 3/24:30 pm
STL
- BOI
1 stop6h 02m
United Airlines
Deal found 2/2![United Airlines logo]()
$281
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/255:20 am
BOI
- STL
1 stop8h 34m
Delta
Mon 3/22:22 pm
STL
- BOI
2 stops10h 23m
Delta
Deal found 2/2![Delta logo]()
$295
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/262:05 pm
GEG
- STL
1 stop7h 18m
Delta
Sun 3/16:40 pm
STL
- GEG
1 stop7h 14m
Delta
Deal found 2/2![Delta logo]()
$309
This Delta deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/265:50 am
BOI
- STL
2 stops10h 52m
Delta
Mon 3/22:22 pm
STL
- BOI
2 stops10h 23m
Delta
Deal found 2/1![Delta logo]()
$313
This Delta deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 2/272:54 pm
BOI
- STL
1 stop7h 29m
Delta
Mon 3/26:40 pm
STL
- BOI
1 stop5h 27m
Delta
Deal found 2/3![Delta logo]()
$325
This Delta deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 2/2812:59 pm
BOI
- STL
1 stop7h 39m
Delta
Sat 3/77:00 am
STL
- BOI
1 stop6h 09m
Delta
Deal found 2/3![Delta logo]()
$237
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/32:40 pm
BOI
- STL
1 stop4h 46m
United Airlines
Tue 3/106:25 am
STL
- BOI
2 stops8h 07m
United Airlines
Deal found 2/2![United Airlines logo]()
$242
This American Airlines deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 3/36:00 am
GEG
- STL
1 stop7h 28m
American Airlines
Thu 3/56:00 am
STL
- GEG
1 stop7h 44m
American Airlines
Deal found 2/3![American Airlines logo]()
$264
This Delta deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/310:41 am
BOI
- STL
2 stops11h 42m
Delta
Tue 3/103:05 pm
STL
- BOI
2 stops9h 39m
Delta
Deal found 2/2![Delta logo]()
$293
This Delta deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 3/2411:30 am
GEG
- STL
2 stops10h 51m
Delta
Mon 3/302:12 pm
STL
- GEG
2 stops10h 38m
Delta
Deal found 2/3![Delta logo]()
$313
This Delta deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 3/255:00 pm
GEG
- STL
1 stop5h 21m
Delta
Mon 3/306:29 am
STL
- GEG
1 stop8h 41m
Delta
Deal found 2/3![Delta logo]()
$262
This Delta deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/306:55 pm
IDA
- STL
1 stop4h 26m
Delta
Sat 4/47:15 am
STL
- IDA
1 stop6h 12m
Delta
Deal found 2/1![Delta logo]()
$279
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 February 4, 2026.
Search for one-way flight options from Idaho to St. Louis. Find affordable one-way fares based on user searches. Data last updated February 4, 2026.
This Priceline deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 4/3011:53 am
BOI
- STL
1 stop6h 19m
Frontier
Deal found 2/3![Frontier logo]()
$95
This Delta deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 4/1112:45 pm
BOI
- STL
1 stop7h 46m
Delta
Deal found 2/3![Delta logo]()
$99
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/2612:15 pm
BOI
- STL
1 stop20h 34m
Frontier
Deal found 2/2![Frontier logo]()
$101
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/2711:56 am
BOI
- STL
1 stop25h 00m
Frontier
Deal found 2/1![Frontier logo]()
$108
This CheapOair deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/1212:15 pm
BOI
- STL
1 stop20h 34m
Frontier
Deal found 2/1![Frontier logo]()
$131
This KAYAK deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/241:43 pm
BOI
- STL
1 stop8h 53m
Delta
Deal found 2/3![Delta logo]()
$136
This Trip.com deal was found by Cheapflights users on 1/31. Clicking the “Pick Dates” 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.
Mon 2/2310:31 pm
IDA
- STL
2 stops40h 22m
Multiple Airlines
Deal found 1/31![Multiple Airlines logo]()
$143
This Southwest deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 2/246:40 am
BOI
- STL
2 stops9h 30m
Southwest
Deal found 2/3![Southwest logo]()
$144
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/2711:56 am
BOI
- STL
3 stops35h 03m
Multiple Airlines
Deal found 2/1![Multiple Airlines logo]()
$157
This American Airlines deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” 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 5/11:29 pm
BOI
- STL
1 stop7h 48m
American Airlines
Deal found 2/3![American Airlines logo]()
$163
This United Airlines deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/37:11 am
BOI
- STL
2 stops12h 15m
United Airlines
Deal found 2/2![United Airlines logo]()
$164
This Expedia deal was found by Cheapflights users on 2/4. Clicking the “Pick Dates” 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.
Mon 4/64:59 pm
IDA
- STL
1 stop20h 52m
Alaska Airlines
Deal found 2/4![Alaska Airlines logo]()
$174
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 February 4, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $197 (Delta) |
One-way from | $95 (Priceline) |
Popular in | January |
Cheapest in | September |
Average price | $501 |
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 2,558,603 searches. Data last updated February 4, 2026.
Use the filters below to find and compare flights from Idaho to St. Louis that are best for you.
Fly from
Idaho
Fly to
St. Louis
Route
Depart
Return
Price
BoiseSt. Louis
BOI - STL
BOISTL
Boise Air Term. Gowen Fld
Tue 3/3
2:40 pm-8:26 pm
1 stop4h 46m
Lambert-St Louis
Tue 3/10
4:30 pm-10:43 pm
1 stop7h 13m
$237
BoiseSt. Louis
BOI - STL
BOISTL
Boise Air Term. Gowen Fld
Sat 2/28
12:59 pm-9:38 pm
1 stop7h 39m
Lambert-St Louis
Sat 3/7
7:00 am-12:09 pm
1 stop6h 09m
$237
SpokaneSt. Louis
GEG - STL
GEGSTL
Spokane
Wed 3/25
5:00 pm-12:21 am
1 stop5h 21m
Lambert-St Louis
Mon 3/30
6:29 am-1:10 pm
1 stop8h 41m
$262
SpokaneSt. Louis
GEG - STL
GEGSTL
Spokane
Tue 3/24
1:50 pm-12:21 am
1 stop8h 31m
Lambert-St Louis
Mon 3/30
6:00 am-11:37 am
1 stop7h 37m
$262
SpokaneSt. Louis
GEG - STL
GEGSTL
Spokane
Tue 3/3
12:25 pm-9:12 pm
1 stop6h 47m
Lambert-St Louis
Thu 3/5
6:00 am-11:44 am
1 stop7h 44m
$264
Idaho FallsSt. Louis
IDA - STL
IDASTL
Idaho Falls Fanning Field
Mon 3/30
6:55 pm-12:21 am
1 stop4h 26m
Lambert-St Louis
Sat 4/4
7:15 am-12:27 pm
1 stop6h 12m
$279
BoiseSt. Louis
BOI - STL
BOISTL
Boise Air Term. Gowen Fld
Tue 3/24
2:22 pm-11:59 pm
1 stop8h 37m
Lambert-St Louis
Mon 3/30
4:20 pm-10:57 pm
1 stop7h 37m
$281
BoiseSt. Louis
BOI - STL
BOISTL
Boise Air Term. Gowen Fld
Wed 2/25
2:40 pm-8:26 pm
1 stop4h 46m
Lambert-St Louis
Mon 3/2
4:30 pm-9:32 pm
1 stop6h 02m
$281
BoiseSt. Louis
BOI - STL
BOISTL
Boise Air Term. Gowen Fld
Sat 5/16
2:25 pm-11:21 pm
1 stop7h 56m
Lambert-St Louis
Tue 5/19
3:59 pm-11:55 pm
2 stops8h 56m
$285
BoiseSt. Louis
BOI - STL
BOISTL
Boise Air Term. Gowen Fld
Tue 3/3
10:41 am-11:23 pm
2 stops11h 42m
Lambert-St Louis
Tue 3/10
3:05 pm-11:44 pm
2 stops9h 39m
$293
Showing 1-10 of 55 results
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
IDA-STL
GEG-STL
JAC-STL
TWF-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
IDA-STL
GEG-STL
JAC-STL
What is the cheapest month to book a flight from Idaho to St. Louis?
Currently, April is the cheapest month in which you can book a flight from Idaho to St. Louis (average of $113). Flying from Idaho to St. Louis in December is currently the most expensive (average of $367). 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.
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 locationsEdwardsville
O'Fallon
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
Chesterfield
Alton
Farmington
Festus
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
St. Louis flight routes
Top destinations
Alternative routes for Idaho to St. Louis
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to St. Louis by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Idaho to St. Louis by cabin class
Find flights from Idaho to St. Louis, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Idaho and St. Louis flights
Browse other Idaho and St. Louis flight options. Last updated on February 4, 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 February 4, 2026.
Idaho to St. Louis flights
Consider these flights traveling from Idaho to St. Louis.
Top 5 airlines flying from Idaho to St. Louis
Discover the top 5 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 2,558,603 searches. Data last updated February 4, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$143 | Average$336 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$226 | Average$373 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$278 | Average$476 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$281 | Average$449 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$286 | Average$601 | FlexibilityNo cancel fee | On-time69% |