$215+ Cheap flights from St. Louis to Idaho Falls (STL - IDA)
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 8/27. Fares are subject to change and may not be available on all flights or dates of travel.
STL — IDA
May 30 — Jun 61
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to Idaho Falls 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 Falls
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Best
Last-minute
One-way
Cheapest flights from St. Louis to Idaho FallsExplore the most affordable flight options available from St. Louis to Idaho Falls. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 30, 2026.
Explore the most affordable flight options available from St. Louis to Idaho Falls. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 30, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/154:52 pm
STL
- IDA
2 stops17h 03m
Multiple Airlines
Mon 7/2010:47 pm
IDA
- STL
1 stop18h 18m
Multiple Airlines
Deal found 4/28![Multiple Airlines logo]()
$371
This Expedia deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/155:33 pm
STL
- IDA
1 stop20h 44m
Alaska Airlines
Tue 5/196:00 am
IDA
- STL
1 stop8h 16m
Alaska Airlines
Deal found 4/27![Alaska Airlines logo]()
$379
This United Airlines deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/265:10 am
STL
- IDA
1 stop5h 40m
United Airlines
Fri 5/292:30 pm
IDA
- STL
1 stop5h 40m
United Airlines
Deal found 4/26![United Airlines logo]()
$385
This United Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/265:10 am
STL
- IDA
1 stop5h 40m
United Airlines
Thu 5/285:54 pm
IDA
- STL
1 stop5h 03m
United Airlines
Deal found 4/28![United Airlines logo]()
$406
This Delta deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/121:59 pm
STL
- IDA
2 stops9h 43m
Delta
Sat 5/163:16 pm
IDA
- STL
1 stop4h 50m
Delta
Deal found 4/27![Delta logo]()
$409
This Delta deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/235:00 pm
STL
- IDA
1 stop6h 42m
Delta
Thu 5/2811:30 am
IDA
- STL
1 stop6h 33m
Delta
Deal found 4/26![Delta logo]()
$419
This United Airlines deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/128:46 am
STL
- IDA
1 stop5h 39m
United Airlines
Sat 5/162:31 pm
IDA
- STL
1 stop5h 12m
United Airlines
Deal found 4/27![United Airlines logo]()
$425
This Kiwi.com deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/303:34 pm
STL
- IDA
2 stops25h 26m
Multiple Airlines
Mon 8/310:47 pm
IDA
- STL
1 stop18h 18m
Multiple Airlines
Deal found 4/27![Multiple Airlines logo]()
$433
This United Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” 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 7/15:10 am
STL
- IDA
1 stop5h 40m
United Airlines
Thu 7/92:30 pm
IDA
- STL
1 stop5h 13m
United Airlines
Deal found 4/29![United Airlines logo]()
$439
This Delta deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/258:00 am
STL
- IDA
1 stop7h 36m
Delta
Wed 8/57:00 pm
IDA
- STL
1 stop4h 37m
Delta
Deal found 4/27![Delta logo]()
$447
This Kiwi.com deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/262:52 pm
STL
- IDA
1 stop26h 08m
Multiple Airlines
Fri 8/710:54 pm
IDA
- STL
2 stops14h 55m
Multiple Airlines
Deal found 4/27![Multiple Airlines logo]()
$448
Best flights from St. Louis to Idaho FallsDiscover carefully curated flight deals from St. Louis to Idaho Falls that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 30, 2026.
Discover carefully curated flight deals from St. Louis to Idaho Falls that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 30, 2026.
This Delta deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/121:59 pm
STL
- IDA
2 stops9h 43m
Delta
Sat 5/163:16 pm
IDA
- STL
1 stop4h 50m
Delta
Deal found 4/27![Delta logo]()
$409
This United Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” 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 7/15:10 am
STL
- IDA
1 stop5h 40m
United Airlines
Thu 7/92:30 pm
IDA
- STL
1 stop5h 13m
United Airlines
Deal found 4/29![United Airlines logo]()
$439
This Alaska Airlines deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/157:41 pm
STL
- IDA
1 stop20h 45m
Alaska Airlines
Fri 5/221:54 pm
IDA
- STL
1 stop9h 00m
Alaska Airlines
Deal found 4/27![Alaska Airlines logo]()
$474
This Delta deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/258:00 am
STL
- IDA
1 stop7h 36m
Delta
Tue 8/47:00 pm
IDA
- STL
1 stop4h 37m
Delta
Deal found 4/27![Delta logo]()
$447
This United Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/35:10 am
STL
- IDA
1 stop5h 40m
United Airlines
Sat 8/85:54 pm
IDA
- STL
1 stop5h 03m
United Airlines
Deal found 4/29![United Airlines logo]()
$500
This Delta deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/235:00 pm
STL
- IDA
1 stop6h 42m
Delta
Thu 5/286:54 pm
IDA
- STL
2 stops12h 24m
Delta
Deal found 4/26![Delta logo]()
$460
This Delta deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” 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 5/261:59 pm
STL
- IDA
2 stops9h 43m
Delta
Thu 5/286:54 pm
IDA
- STL
2 stops13h 50m
Delta
Deal found 4/29![Delta logo]()
$500
This Delta deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/258:00 am
STL
- IDA
1 stop7h 36m
Delta
Thu 8/67:00 pm
IDA
- STL
1 stop4h 37m
Delta
Deal found 4/27![Delta logo]()
$529
Last-minute flights from St. Louis to Idaho FallsDiscover last-minute flight deals from St. Louis to Idaho Falls. Data last updated April 30, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Idaho Falls. Data last updated April 30, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/121:59 pm
STL
- IDA
2 stops9h 43m
Delta
Sat 5/163:16 pm
IDA
- STL
1 stop4h 50m
Delta
Deal found 4/27![Delta logo]()
$409
This United Airlines deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/128:46 am
STL
- IDA
1 stop5h 39m
United Airlines
Sat 5/162:31 pm
IDA
- STL
1 stop5h 12m
United Airlines
Deal found 4/27![United Airlines logo]()
$425
This Alaska Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/134:12 pm
STL
- IDA
1 stop7h 41m
Alaska Airlines
Sun 5/176:00 am
IDA
- STL
1 stop8h 16m
Alaska Airlines
Deal found 4/28![Alaska Airlines logo]()
$447
This Expedia deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/155:33 pm
STL
- IDA
1 stop20h 44m
Alaska Airlines
Tue 5/196:00 am
IDA
- STL
1 stop8h 16m
Alaska Airlines
Deal found 4/27![Alaska Airlines logo]()
$379
This Alaska Airlines deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/157:41 pm
STL
- IDA
1 stop20h 45m
Alaska Airlines
Fri 5/221:54 pm
IDA
- STL
1 stop9h 00m
Alaska Airlines
Deal found 4/27![Alaska Airlines logo]()
$474
This Delta deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/235:00 pm
STL
- IDA
1 stop6h 42m
Delta
Thu 5/2811:30 am
IDA
- STL
1 stop6h 33m
Delta
Deal found 4/26![Delta logo]()
$419
This United Airlines deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/265:10 am
STL
- IDA
1 stop5h 40m
United Airlines
Fri 5/292:30 pm
IDA
- STL
1 stop5h 40m
United Airlines
Deal found 4/26![United Airlines logo]()
$385
This United Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/265:10 am
STL
- IDA
1 stop5h 40m
United Airlines
Thu 5/285:54 pm
IDA
- STL
1 stop5h 03m
United Airlines
Deal found 4/28![United Airlines logo]()
$406
This Delta deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/261:59 pm
STL
- IDA
2 stops9h 43m
Delta
Thu 5/286:54 pm
IDA
- STL
2 stops12h 24m
Delta
Deal found 4/28![Delta logo]()
$465
One-way flights from St. Louis to Idaho FallsSearch for one-way flight options from St. Louis to Idaho Falls. Find affordable one-way fares based on user searches. Data last updated April 30, 2026.
Search for one-way flight options from St. Louis to Idaho Falls. Find affordable one-way fares based on user searches. Data last updated April 30, 2026.
This Travelocity deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” 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.
Thu 8/277:34 pm
STL
- IDA
1 stop21h 03m
Alaska Airlines
Deal found 4/29![Alaska Airlines logo]()
$215
This American Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” 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 8/276:42 am
STL
- IDA
1 stop8h 00m
American Airlines
Deal found 4/29![American Airlines logo]()
$232
This Delta deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” 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 8/272:18 pm
STL
- IDA
2 stops8h 56m
Delta
Deal found 4/29![Delta logo]()
$271
This American Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/55:13 pm
STL
- IDA
1 stop5h 58m
American Airlines
Deal found 4/29![American Airlines logo]()
$316
This Alaska Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/56:02 am
STL
- IDA
2 stops32h 04m
Alaska Airlines
Deal found 4/29![Alaska Airlines logo]()
$458
This United Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/56:00 am
STL
- IDA
3 stops28h 50m
United Airlines
Deal found 4/28![United Airlines logo]()
$496
This United Airlines deal was found by Cheapflights users on 4/29. Clicking the “Pick Dates” 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 8/276:00 am
STL
- IDA
3 stops10h 29m
United Airlines
Deal found 4/29![United Airlines logo]()
$664
Find flight deals from St. Louis to Idaho Falls
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Idaho Falls (IDA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated April 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $371 (Kiwi.com) |
One-way from | $215 (Travelocity) |
Popular in | November |
Cheapest in | August |
Average price | $683 |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Idaho Falls 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 April 30, 2026.
Use the filters below to find and compare flights from St. Louis to Idaho Falls that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisIdaho Falls
STL - IDA
STLIDA
Lambert-St Louis
Tue 5/12
1:59 pm-10:42 pm
2 stops9h 43m
Idaho Falls Fanning Field
Sat 5/16
3:16 pm-9:06 pm
1 stop4h 50m
$409
St. LouisIdaho Falls
STL - IDA
STLIDA
Lambert-St Louis
Wed 7/1
5:10 am-9:50 am
1 stop5h 40m
Idaho Falls Fanning Field
Thu 7/9
2:30 pm-8:43 pm
1 stop5h 13m
$439
St. LouisIdaho Falls
STL - IDA
STLIDA
Lambert-St Louis
Sat 7/25
8:00 am-2:36 pm
1 stop7h 36m
Idaho Falls Fanning Field
Tue 8/4
7:00 pm-12:37 am
1 stop4h 37m
$447
St. LouisIdaho Falls
STL - IDA
STLIDA
Lambert-St Louis
Sat 5/23
5:00 pm-10:42 pm
1 stop6h 42m
Idaho Falls Fanning Field
Thu 5/28
6:54 pm-8:18 am
2 stops12h 24m
$460
St. LouisIdaho Falls
STL - IDA
STLIDA
Lambert-St Louis
Fri 5/15
7:41 pm-3:26 pm
1 stop20h 45m
Idaho Falls Fanning Field
Fri 5/22
1:54 pm-11:54 pm
1 stop9h 00m
$474
Quickest round-trip
St. LouisIdaho Falls
STL - IDA
STLIDA
Lambert-St Louis
Mon 8/3
5:10 am-9:50 am
1 stop5h 40m
Idaho Falls Fanning Field
Sat 8/8
5:54 pm-11:57 pm
1 stop5h 03m
$500
St. LouisIdaho Falls
STL - IDA
STLIDA
Lambert-St Louis
Tue 5/26
1:59 pm-10:42 pm
2 stops9h 43m
Idaho Falls Fanning Field
Thu 5/28
6:54 pm-9:44 am
2 stops13h 50m
$500
St. LouisIdaho Falls
STL - IDA
STLIDA
Lambert-St Louis
Sat 7/25
8:00 am-2:36 pm
1 stop7h 36m
Idaho Falls Fanning Field
Thu 8/6
7:00 pm-12:37 am
1 stop4h 37m
$529
Cheapest one-way
St. LouisIdaho Falls
STL - IDA
STLIDA
Lambert-St Louis
Thu 8/27
7:34 pm-3:37 pm
1 stop21h 03m
$215
St. LouisIdaho Falls
STL - IDA
STLIDA
Lambert-St Louis
Thu 8/27
2:18 pm-10:14 pm
2 stops8h 56m
$271
Showing 1-10 of 13 resultsSorted by cheapest first
Compare providers for flights from St. Louis to Idaho Falls
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Idaho Falls in April.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on St. Louis-Idaho Falls flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Idaho Falls flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Idaho Falls flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-Idaho Falls flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Idaho Falls flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from St. Louis to Idaho Falls
Have a flexible travel schedule? Discover the best time to fly to Idaho Falls from St. Louis with our price prediction graph.
STL-IDA
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 Falls
Reviews of airlines servicing Idaho Falls
Get insights into the airlines that provide service to Idaho Falls. 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 Falls. Reviews last updated April 30, 2026.
Peruse reviews from past customers who have flown with Delta and United Airlines from St. Louis to Idaho Falls to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Food
7.2
Entertainment
7.8
Crew
8.5
Comfort
7.9
Overall
7.9
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Boarding
8.1
Food
7.2
Entertainment
7.8
Crew
8.5
Comfort
7.9
Overall
7.9
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Boarding
8.1
Food
7.2
Entertainment
7.8
Crew
8.5
Comfort
7.9
Overall
7.9
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Idaho Falls. 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 Idaho Falls?
Book flights to Idaho Falls if you plan to visit one of these locationsRexburg
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St. Louis and Idaho Falls flights
Browse other St. Louis and Idaho Falls flight options. Last updated on April 30, 2026.
Other flights from St. Louis
Browse through other flights departing from St. Louis. Flights are based on user searches made on Cheapflights and were last updated on April 30, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 2 airlines flying from St. Louis to Idaho Falls
Discover the top 2 airlines that operate flights from St. Louis to Idaho Falls. 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 April 30, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$163 | Average$410 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$338 | Average$565 | FlexibilityNo cancel fee | On-time69% |