US$355️ Cheap Flights from Idaho Falls to St. Louis (2024)

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Idaho Falls to St. Louis - Flights Starting at US$355

Book one-way or return flights from Idaho Falls to St. Louis from as little as US$355. Choose from the popular airlines below and book your flight today!

One way
Round-trip

Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.

We've found these cheap flights for you. You may book a one-way or round trip as per your needs.

We monitor flight fares to help you seize the best deals effortlessly

Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.

Cheapest airlines flights from Idaho Falls to St. Louis

View airlines operating flights from Idaho Falls to St. Louis. Compare prices, find the option that best suits your travel needs, and enjoy a comfortable journey with a trusted airline.

Delta Air Lines

From US$319

United Airlines

From US$355

Alaska Airlines

From US$358

American Airlines

From US$499

ANA airlines

Find more flights and airlines

Alternative Routes from Idaho Falls to St. Louis

Discover different routes, airlines, and transfers and find the best alternative flights for your journey from Idaho Falls to St. Louis.

Cheapest
IDA
19:00
13h 23m
2 transfer
STL
09:23
Idaho Falls Regional Airport - St. Louis Lambert International Airport
Mon, Jun 10Delta Air Lines
US$319
IDA
19:00
13h 23m
2 transfer
STL
09:23
Idaho Falls Regional Airport - St. Louis Lambert International Airport
Mon, Jun 10Delta Air Lines
US$319
Find More Flights

Frequently Asked Questions

When are flight tickets from Idaho Falls (IDA) to St. Louis (STL) the cheapest?
Airlines adjust prices for flights from Idaho Falls to St. Louis based on the departure date and time of your selection. By analyzing data from all airlines, we've discovered that on Trip.com, you can find the lowest flight prices on Tuesdays, Wednesdays, and Saturdays.
How much do flights from Idaho Falls (IDA) to St. Louis (STL) cost?
According to Trip.com's data, the lowest price is around $622.
What is the transportation method from the main airport to downtown in St. Louis?
- The distance from St.Louis Lambert International Airport to downtown is about 20km. It takes about 40 minutes by taxi.

How to find a cheap flight from Idaho Falls to St. Louis

Wait until the last minute and flight costs are often sky-high. Plan ahead, book the right way, and your savings can soar. We have loads of saving tips to help you find a cheap flight from Idaho Falls to St. Louis. Book your flights at the right time and save more.

Book Early

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Compare Flight Prices

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Look Out for Deals

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Check One-way Fares

Buying two cheap one-way flights can sometimes be a better deal than a round-trip.

Try Different Dates

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