$200+ Cheap flights from St. Louis to Idaho Falls (STL - IDA)
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 11/17. Fares are subject to change and may not be available on all flights or dates of travel.
STL — IDA
Nov 30 — Dec 71
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
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
Cheapest
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 October 31, 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 October 31, 2026.
This Delta deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” 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 12/222:15 pm -
1 stop4h 58m
Sun 12/275:40 am -
1 stop6h 40m
Deal found 10/30![Delta logo]()
$349
This United Airlines deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” 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 12/242:25 pm -
1 stop7h 54m
Tue 12/292:37 pm -
1 stop5h 31m
Deal found 10/30![United Airlines logo]()
$359
This United Airlines deal was found by Cheapflights users on 10/27. 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.
Sat 11/148:50 am -
1 stop7h 48m
Tue 11/172:35 pm -
1 stop5h 24m
Deal found 10/27![United Airlines logo]()
$374
This Delta deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” 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 12/222:15 pm -
1 stop4h 58m
Tue 12/295:40 am -
1 stop6h 40m
Deal found 10/30![Delta logo]()
$382
This Alaska Airlines deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” 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 12/244:32 pm -
1 stop8h 13m
Mon 12/286:00 am -
1 stop8h 34m
Deal found 10/30![Alaska Airlines logo]()
$392
This Alaska Airlines deal was found by Cheapflights users on 10/29. 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.
Fri 11/136:00 am -
1 stop10h 18m
Tue 11/176:04 am -
1 stop7h 21m
Deal found 10/29![Alaska Airlines logo]()
$399
This Delta deal was found by Cheapflights users on 10/29. 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.
Sat 11/1411:00 am -
2 stops12h 22m
Tue 11/176:57 pm -
2 stops13h 03m
Deal found 10/29![Delta logo]()
$409
This Alaska Airlines deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” 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 12/256:00 am -
1 stop10h 18m
Wed 12/306:00 am -
1 stop8h 34m
Deal found 10/30![Alaska Airlines logo]()
$415
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 October 31, 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 October 31, 2026.
This Delta deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” 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 12/222:15 pm -
1 stop4h 58m
Sun 12/275:40 am -
1 stop6h 40m
Deal found 10/30![Delta logo]()
$349
This United Airlines deal was found by Cheapflights users on 10/27. 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.
Sat 11/148:50 am -
1 stop7h 48m
Tue 11/172:35 pm -
1 stop5h 24m
Deal found 10/27![United Airlines logo]()
$374
This American Airlines deal was found by Cheapflights users on 10/27. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/132:54 pm -
1 stop7h 49m
Mon 11/161:35 pm -
1 stop7h 24m
Deal found 10/27![American Airlines logo]()
$454
This Delta deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” 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 12/222:15 pm -
1 stop4h 58m
Tue 12/295:40 am -
2 stops16h 48m
Deal found 10/30![Delta logo]()
$397
This Delta deal was found by Cheapflights users on 10/29. 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.
Sat 11/1411:00 am -
2 stops12h 22m
Tue 11/176:57 pm -
2 stops13h 03m
Deal found 10/29![Delta logo]()
$409
This United Airlines deal was found by Cheapflights users on 10/28. 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.
Sat 2/64:30 pm -
1 stop5h 40m
Tue 2/92:30 pm -
1 stop5h 08m
Deal found 10/28![United Airlines logo]()
$459
Last-minute flights from St. Louis to Idaho FallsDiscover last-minute flight deals from St. Louis to Idaho Falls. Data last updated October 31, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Idaho Falls. Data last updated October 31, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 10/29. 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.
Fri 11/68:50 am -
1 stop7h 48m
Mon 11/92:35 pm -
1 stop5h 24m
Deal found 10/29![United Airlines logo]()
$489
This Alaska Airlines deal was found by Cheapflights users on 10/28. 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.
Thu 11/126:00 am -
1 stop10h 18m
Mon 11/161:53 pm -
1 stop9h 06m
Deal found 10/28![Alaska Airlines logo]()
$470
This United Airlines deal was found by Cheapflights users on 10/28. 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.
Thu 11/125:00 am -
2 stops9h 28m
Mon 11/162:35 pm -
1 stop5h 24m
Deal found 10/28![United Airlines logo]()
$514
This Alaska Airlines deal was found by Cheapflights users on 10/29. 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.
Fri 11/136:00 am -
1 stop10h 18m
Tue 11/176:04 am -
1 stop7h 21m
Deal found 10/29![Alaska Airlines logo]()
$399
This American Airlines deal was found by Cheapflights users on 10/27. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/132:54 pm -
1 stop7h 49m
Mon 11/161:35 pm -
1 stop7h 24m
Deal found 10/27![American Airlines logo]()
$454
This United Airlines deal was found by Cheapflights users on 10/27. 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.
Sat 11/148:50 am -
1 stop7h 48m
Tue 11/172:35 pm -
1 stop5h 24m
Deal found 10/27![United Airlines logo]()
$374
This Delta deal was found by Cheapflights users on 10/29. 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.
Sat 11/1411:00 am -
2 stops12h 22m
Tue 11/176:57 pm -
2 stops13h 03m
Deal found 10/29![Delta logo]()
$409
This United Airlines deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” 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 11/148:50 am -
1 stop5h 38m
Wed 11/1810:35 am -
1 stop5h 22m
Deal found 10/30![United Airlines logo]()
$417
This American Airlines deal was found by Cheapflights users on 10/27. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/141:20 pm -
2 stops10h 39m
Tue 11/176:36 am -
2 stops11h 46m
Deal found 10/27![American Airlines logo]()
$464
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 October 31, 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 October 31, 2026.
This Priceline deal was found by Cheapflights users on 10/29. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/176:00 am -
1 stop10h 18m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/29![Alaska Airlines logo]()
$200
This American Airlines deal was found by Cheapflights users on 10/29. 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.
Tue 11/1711:35 am -
2 stops12h 24m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/29![American Airlines logo]()
$213
This Priceline deal was found by Cheapflights users on 10/29. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/63:23 pm -
1 stop8h 31m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/29![Alaska Airlines logo]()
$245
This American Airlines deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” 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 11/92:28 pm -
1 stop9h 31m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/30![American Airlines logo]()
$255
This United Airlines deal was found by Cheapflights users on 10/29. 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.
Fri 11/68:30 am -
2 stops8h 08m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/29![United Airlines logo]()
$260
This Priceline deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” 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.
Sun 11/86:00 am -
1 stop10h 18m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/30![Alaska Airlines logo]()
$320
This Delta deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” 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 11/89:47 am -
2 stops9h 29m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/30![Delta logo]()
$593
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/69:49 am -
3 stops47h 23m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/29![Multiple Airlines logo]()
$604
This Kiwi.com deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” 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 11/81:28 pm -
3 stops30h 29m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/30![Multiple Airlines logo]()
$613
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/176:13 am -
3 stops17h 41m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/29![Multiple Airlines logo]()
$830
This Kiwi.com deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” 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 11/95:22 pm -
3 stops30h 32m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/30![Multiple Airlines logo]()
$1,014
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 October 31, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $349 (Delta) |
One-way from | $200 (Priceline) |
Popular in | April |
Cheapest in | November |
Average price | $519 |
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 7,457,451 searches. Data last updated October 31, 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 Lambert-St Louis - IDA Idaho Falls Fanning Field
STLIDA
Lambert-St Louis
Mon 11/9
2:28 pm-10:59 pm
1 stop9h 31m
Idaho Falls Fanning Field
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$255
Quickest round-trip
St. LouisIdaho Falls
STL Lambert-St Louis - IDA Idaho Falls Fanning Field
STLIDA
Lambert-St Louis
Fri 11/6
8:30 am-3:38 pm
2 stops8h 08m
Idaho Falls Fanning Field
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$260
St. LouisIdaho Falls
STL Lambert-St Louis - IDA Idaho Falls Fanning Field
STLIDA
Lambert-St Louis
Tue 12/22
2:15 pm-6:13 pm
1 stop4h 58m
Idaho Falls Fanning Field
Sun 12/27
5:40 am-1:20 pm
1 stop6h 40m
$349
St. LouisIdaho Falls
STL Lambert-St Louis - IDA Idaho Falls Fanning Field
STLIDA
Lambert-St Louis
Sat 11/14
8:50 am-3:38 pm
1 stop7h 48m
Idaho Falls Fanning Field
Tue 11/17
2:35 pm-8:59 pm
1 stop5h 24m
$374
St. LouisIdaho Falls
STL Lambert-St Louis - IDA Idaho Falls Fanning Field
STLIDA
Lambert-St Louis
Tue 12/22
2:15 pm-6:13 pm
1 stop4h 58m
Idaho Falls Fanning Field
Tue 12/29
5:40 am-11:28 pm
2 stops16h 48m
$397
St. LouisIdaho Falls
STL Lambert-St Louis - IDA Idaho Falls Fanning Field
STLIDA
Lambert-St Louis
Sat 11/14
11:00 am-10:22 pm
2 stops12h 22m
Idaho Falls Fanning Field
Tue 11/17
6:57 pm-9:00 am
2 stops13h 03m
$409
St. LouisIdaho Falls
STL Lambert-St Louis - IDA Idaho Falls Fanning Field
STLIDA
Lambert-St Louis
Fri 11/13
2:54 pm-9:43 pm
1 stop7h 49m
Idaho Falls Fanning Field
Mon 11/16
1:35 pm-9:59 pm
1 stop7h 24m
$454
St. LouisIdaho Falls
STL Lambert-St Louis - IDA Idaho Falls Fanning Field
STLIDA
Lambert-St Louis
Sat 2/6
4:30 pm-9:10 pm
1 stop5h 40m
Idaho Falls Fanning Field
Tue 2/9
2:30 pm-8:38 pm
1 stop5h 08m
$459
St. LouisIdaho Falls
STL Lambert-St Louis - IDA Idaho Falls Fanning Field
STLIDA
Lambert-St Louis
Sun 11/8
9:47 am-6:16 pm
2 stops9h 29m
Idaho Falls Fanning Field
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$593
St. LouisIdaho Falls
STL Lambert-St Louis - IDA Idaho Falls Fanning Field
STLIDA
Lambert-St Louis
Fri 11/6
9:49 am-8:12 am
3 stops47h 23m
Idaho Falls Fanning Field
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$604
Showing 1-10 of 12 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 October.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 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.
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 October 31, 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.
Comfort
7.8
Overall
7.8
Entertainment
7.8
Food
7.2
Crew
8.5
Boarding
8.1
Reviews
1 / 20
6.0
GoodEllen,Oct 2026
GRR - ATL
Comfort
7.8
Overall
7.8
Entertainment
7.8
Food
7.2
Crew
8.5
Boarding
8.1
Reviews
1 / 20
6.0
GoodEllen,Oct 2026
GRR - ATL
Comfort
7.8
Overall
7.8
Entertainment
7.8
Food
7.2
Crew
8.5
Boarding
8.1
Reviews
1 / 20
6.0
GoodEllen,Oct 2026
GRR - 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.
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
Idaho Falls flight routes
Other flight options
Other flights from St. Louis
Popular flights
Alternative routes for St. Louis to Idaho Falls
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Idaho Falls by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from St. Louis to Idaho Falls by cabin class
Find flights from St. Louis to Idaho Falls, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Other flights to Idaho Falls
Explore flights to Idaho Falls departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on October 31, 2026.
St. Louis and Idaho Falls flights
Browse other St. Louis and Idaho Falls flight options. Last updated on October 31, 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 October 31, 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 7,457,451 searches. Data last updated October 31, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$338 | Average$530 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$398 | Average$509 | FlexibilityNo cancel fee | On-timeN/A |