Which airports can I use when flying from St. Louis to Idaho Falls?

Flights from St. Louis to Idaho Falls usually depart from Lambert-St Louis (STL) and arrive at Idaho Falls Fanning Field (IDA).

What cabin classes can I book on flights from St. Louis to Idaho Falls?

Only Economy Class is available on flights from St. Louis to Idaho Falls.

Which airports do connecting flights from St. Louis to Idaho Falls pass through?

One-stop flights from St. Louis to Idaho Falls most commonly connect through: • Denver Intl (DEN) - 78% of one-stop connections • Salt Lake City (SLC) - 15% of one-stop connections • Chicago O'Hare Intl (ORD) - 6% of one-stop connections • Seattle/Tacoma Intl (SEA) - 1% of one-stop connections

Can I save money by using flexible dates for flights from St. Louis to Idaho Falls?

Yes. Flexible dates can save you up to 34% on flights from St. Louis to Idaho Falls. Tuesday is the cheapest departure day at $455 round-trip on average, while Wednesday is the most expensive at $683, a difference of $228. KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

How long is a flight from St. Louis to Idaho Falls?

A nonstop flight from St. Louis to Idaho Falls takes 00m, covering 1,171 miles.

Do I need a passport to fly from St. Louis to Idaho Falls?

No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID or another TSA-accepted form of identification.

Have flight prices from St. Louis to Idaho Falls changed much recently?

Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $349 to $1,916. That means the highest observed fare was about 5x higher than the lowest one.

How are flight prices from St. Louis to Idaho Falls looking right now?

One-way fares from St. Louis to Idaho Falls are currently higher than usual. Average one-way flight prices are about $392, which is 40% above the typical average for this route.

How much time can I save by choosing a different layover airport from St. Louis to Idaho Falls?

Flying via Denver Intl (DEN) gives the shortest average 1-stop total travel time at 5h 31m, compared with 5h 43m via Salt Lake City (SLC) and 6h 51m via Chicago O'Hare Intl (ORD).

What is the time difference between St. Louis and Idaho Falls?

Idaho Falls is 1 hour behind St. Louis (Mountain Time vs Central Time). Plan for the time shift when scheduling connections or first-day activities.

What car rental options are available at Idaho Falls Fanning Field Airport (IDA)?

Idaho Falls Fanning Field Airport (IDA) hosts 5 major car rental companies, with daily rates starting from around $34 for economy cars. Top options include: • Alamo • Hertz • Enterprise Rent-A-Car • Budget • National

How much should I expect to pay for a St. Louis to Idaho Falls flight?

Round-trip flights from St. Louis to Idaho Falls range from $451 to $683, with an average of $509 over the past 12 months. Anything below $451 counts as a good deal.

How much is a round-trip flight from St. Louis to Idaho Falls?

Round-trip flights from St. Louis to Idaho Falls typically range from $451 to $683. The lowest price found in the past 5 days was $349, on Delta.

What's the cheapest day of the week to fly from St. Louis to Idaho Falls?

Based on deals KAYAK users found in the last 12 months, Tuesday is the cheapest day of the week to fly from St. Louis to Idaho Falls. It’s 11% cheaper than the average day, while Wednesday is the most expensive, with prices 34% higher.

Which airline is the cheapest to fly from St. Louis to Idaho Falls?

Delta ($349) and United Airlines ($349) are the cheapest airlines to fly round-trip from St. Louis to Idaho Falls according to KAYAK data over the last 5 days.

What’s the most popular layover airport when flying from St. Louis to Idaho Falls?

Denver Intl (DEN) is the most popular layover for the St. Louis to Idaho Falls route. 78% of KAYAK users who booked 1-stop round-trips over the past 3 months connected via DEN.

What is the cheapest layover airport when flying from St. Louis to Idaho Falls?

Flights via Seattle/Tacoma Intl (SEA) offer the most affordable fares, with an average round-trip price of $367. Based on KAYAK data over the past 3 months.

When flying from St. Louis to Idaho Falls which airport offers the shortest layover?

Denver Intl (DEN) had the shortest average connection time for St. Louis to Idaho Falls layovers at 3h 22m over the past 3 months.

$185 CHEAP FLIGHTS from St. Louis to Idaho Falls (STL - IDA)

Save 21% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Cheapest round-trip

$349

Typical prices: $451-$683

Delta

Wed 10/24Fri 11/9

STL - IDA • 1 stop

Cheapest one-way

$185

Typical prices: $239-$355

United Airlines

Mon 10/22

STL - IDA • 1 stop

Nonstop flights

Not available

There are currently no direct flights between St. Louis and Idaho Falls. You'll need to take a connecting flight to reach the destination.

Insights

When to travel

March

Cheapest • 34% price drop

August

Most popular

Good to know

Top layover airports

Seattle/Tacoma Intl (SEA)

Cheapest • Avg $367 (round-trip)

Denver Intl (DEN)

Shortest trip • 5h 31m (one-way)

Insights

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We hope you love your trip to Idaho Falls!

Flight Deals

Cheap Flights from St. Louis to Idaho Falls (STL-IDA)

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Recent round-trip flight deals from St. Louis to Idaho Falls

Sat, Oct 24 - Sun, Nov 8

5:00 pm - 10:10 pmSTL Lambert-St Louis-IDA Idaho Falls Fanning Field

6h 10m1 stop Salt Lake City

6:56 pm - 12:44 amIDA Idaho Falls Fanning Field-STL Lambert-St Louis

4h 48m1 stop Salt Lake City

$349Delta

Sat, Oct 24 - Mon, Nov 9

5:00 pm - 10:10 pmSTL Lambert-St Louis-IDA Idaho Falls Fanning Field

6h 10m1 stop Salt Lake City

6:57 pm - 12:40 amIDA Idaho Falls Fanning Field-STL Lambert-St Louis

4h 43m1 stop Salt Lake City

$349Delta

Sat, Oct 24 - Sat, Nov 7

5:10 am - 9:53 amSTL Lambert-St Louis-IDA Idaho Falls Fanning Field

5h 43m1 stop Denver Intl

10:35 am - 4:57 pmIDA Idaho Falls Fanning Field-STL Lambert-St Louis

5h 22m1 stop Denver Intl

$349United Airlines

Thu, Oct 29 - Sat, Oct 31

5:40 am - 1:09 pmSTL Lambert-St Louis-IDA Idaho Falls Fanning Field

8h 29m1 stop Dallas/Fort Worth

1:50 pm - 9:13 pmIDA Idaho Falls Fanning Field-STL Lambert-St Louis

6h 23m1 stop Chicago O'Hare Intl

$349American Airlines

Tue, Oct 27 - Sun, Nov 8

7:45 am - 12:22 pmSTL Lambert-St Louis-IDA Idaho Falls Fanning Field

5h 37m1 stop Salt Lake City

6:56 pm - 12:44 amIDA Idaho Falls Fanning Field-STL Lambert-St Louis

4h 48m1 stop Salt Lake City

$349Delta

Sat, Oct 24 - Tue, Nov 10

5:00 pm - 10:10 pmSTL Lambert-St Louis-IDA Idaho Falls Fanning Field

6h 10m1 stop Salt Lake City

6:00 am - 1:30 pmIDA Idaho Falls Fanning Field-STL Lambert-St Louis

6h 30m1 stop Salt Lake City

$349Delta

Sat, Oct 24 - Sat, Nov 7

5:10 am - 9:53 amSTL Lambert-St Louis-IDA Idaho Falls Fanning Field

5h 43m1 stop Denver Intl

10:35 am - 9:40 pmIDA Idaho Falls Fanning Field-STL Lambert-St Louis

10h 05m2 stops Denver Intl Chicago O'Hare Intl

$354United Airlines

Thu, Oct 15 - Sat, Oct 24

5:10 am - 9:53 amSTL Lambert-St Louis-IDA Idaho Falls Fanning Field

5h 43m1 stop Denver Intl

2:28 pm - 8:36 pmIDA Idaho Falls Fanning Field-STL Lambert-St Louis

5h 08m1 stop Denver Intl

$374United Airlines

Tue, Nov 10 - Fri, Nov 13

1:20 pm - 10:59 pmSTL Lambert-St Louis-IDA Idaho Falls Fanning Field

10h 39m2 stops Chicago O'Hare Intl Phoenix Sky Harbor Intl

6:36 am - 7:22 pmIDA Idaho Falls Fanning Field-STL Lambert-St Louis

11h 46m2 stops Phoenix Sky Harbor Intl Chicago O'Hare Intl

$380American Airlines

Wed, Oct 21 - Mon, Nov 9

7:02 am - 3:20 pmSTL Lambert-St Louis-IDA Idaho Falls Fanning Field

9h 18m1 stop Seattle/Tacoma Intl

1:53 pm - 11:59 pmIDA Idaho Falls Fanning Field-STL Lambert-St Louis

9h 06m1 stop Seattle/Tacoma Intl

$392Alaska Airlines

Recent last minute flight deals from St. Louis to Idaho Falls

Sun, Oct 4 - Sat, Oct 10

5:10 am - 9:53 amSTL Lambert-St Louis-IDA Idaho Falls Fanning Field

5h 43m1 stop Denver Intl

2:28 pm - 8:36 pmIDA Idaho Falls Fanning Field-STL Lambert-St Louis

5h 08m1 stop Denver Intl

$499United Airlines

Fri, Oct 9 - Sat, Oct 10

7:29 am - 1:20 pmSTL Lambert-St Louis-IDA Idaho Falls Fanning Field

6h 51m1 stop Chicago O'Hare Intl

6:18 am - 2:30 pmIDA Idaho Falls Fanning Field-STL Lambert-St Louis

7h 12m1 stop Dallas/Fort Worth

$599American Airlines

Fri, Oct 9 - Mon, Oct 12

3:20 pm - 9:42 pmSTL Lambert-St Louis-IDA Idaho Falls Fanning Field

7h 22m1 stop Dallas/Fort Worth

1:50 pm - 8:57 pmIDA Idaho Falls Fanning Field-STL Lambert-St Louis

6h 07m1 stop Chicago O'Hare Intl

$714American Airlines

Sun, Oct 4 - Sat, Oct 10

5:43 am - 11:45 amSTL Lambert-St Louis-IDA Idaho Falls Fanning Field

7h 02m1 stop Dallas/Fort Worth

6:18 am - 12:19 amIDA Idaho Falls Fanning Field-STL Lambert-St Louis

17h 01m2 stops Dallas/Fort Worth Chicago O'Hare Intl

$749American Airlines

Fri, Oct 9 - Sun, Oct 11

4:39 pm - 8:54 pmSTL Lambert-St Louis-IDA Idaho Falls Fanning Field

5h 15m1 stop Denver Intl

5:51 pm - 11:44 pmIDA Idaho Falls Fanning Field-STL Lambert-St Louis

4h 53m1 stop Denver Intl

$779United Airlines

Fri, Oct 9 - Sat, Oct 10

2:22 pm - 6:16 pmSTL Lambert-St Louis-IDA Idaho Falls Fanning Field

4h 54m1 stop Salt Lake City

6:00 am - 4:38 pmIDA Idaho Falls Fanning Field-STL Lambert-St Louis

9h 38m2 stops Salt Lake City Minneapolis St Paul

$837Delta

Fri, Oct 9 - Sun, Oct 11

7:01 pm - 1:24 pmSTL Lambert-St Louis-IDA Idaho Falls Fanning Field

19h 23m2 stops Chicago O'Hare Intl Denver Intl

4:05 pm - 11:44 pmIDA Idaho Falls Fanning Field-STL Lambert-St Louis

6h 39m1 stop Denver Intl

$881United Airlines

Fri, Oct 9 - Mon, Oct 12

7:01 pm - 1:24 pmSTL Lambert-St Louis-IDA Idaho Falls Fanning Field

19h 23m2 stops Chicago O'Hare Intl Denver Intl

5:51 pm - 11:44 pmIDA Idaho Falls Fanning Field-STL Lambert-St Louis

4h 53m1 stop Denver Intl

$881United Airlines

Fri, Oct 9 - Sat, Oct 10

9:47 am - 6:16 pmSTL Lambert-St Louis-IDA Idaho Falls Fanning Field

9h 29m2 stops Minneapolis St Paul Salt Lake City

6:00 am - 4:38 pmIDA Idaho Falls Fanning Field-STL Lambert-St Louis

9h 38m2 stops Salt Lake City Minneapolis St Paul

$927Delta

Sun, Oct 4 - Sat, Oct 10

5:00 am - 1:37 pmSTL Lambert-St Louis-IDA Idaho Falls Fanning Field

9h 37m2 stops Chicago O'Hare Intl Dallas/Fort Worth

6:18 am - 9:13 pmIDA Idaho Falls Fanning Field-STL Lambert-St Louis

13h 55m2 stops Dallas/Fort Worth Chicago O'Hare Intl

$1,186American Airlines

Booking Insights

Price, demand and travel trends for St. Louis to Idaho Falls flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights with more confidence.

Prices

Airlines

Layovers

How much is a round-trip flight from St. Louis to Idaho Falls? This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from St. Louis to Idaho Falls departing in october.
What's the cheapest day of the week to fly from St. Louis to Idaho Falls?: Based on deals KAYAK users found in the last 12 months, Tuesday is the cheapest day of the week to fly from St. Louis to Idaho Falls. It’s 11% cheaper than the average day, while Wednesday is the most expensive, with prices 34% higher.

Find deals

Low season	January
High season	August
Cheapest flight	$185

The most popular month to fly with an average 56% increase in travelers.

One-way flight from St. Louis to Idaho Falls

When to book flights from St. Louis to Idaho Falls

Are your dates flexible? Find out the best times to travel from St. Louis to Idaho Falls based on our flight data from the last year. Discover the cheapest month and even day to fly.

Estimated round-trip price

KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

What cabin classes can I book on flights from St. Louis to Idaho Falls?
Only Economy Class is available on flights from St. Louis to Idaho Falls.
How long is a flight from St. Louis to Idaho Falls?
A nonstop flight from St. Louis to Idaho Falls takes 00m, covering 1,171 miles.
Do I need a passport to fly from St. Louis to Idaho Falls?
No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID or another TSA-accepted form of identification.
How much should I expect to pay for a St. Louis to Idaho Falls flight?
Round-trip flights from St. Louis to Idaho Falls range from $451 to $683, with an average of $509 over the past 12 months. Anything below $451 counts as a good deal.
Have flight prices from St. Louis to Idaho Falls changed much recently?
Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $349 to $1,916. That means the highest observed fare was about 5x higher than the lowest one.
How are flight prices from St. Louis to Idaho Falls looking right now?
One-way fares from St. Louis to Idaho Falls are currently higher than usual. Average one-way flight prices are about $392, which is 40% above the typical average for this route.
What car rental options are available at Idaho Falls Fanning Field Airport (IDA)?
Idaho Falls Fanning Field Airport (IDA) hosts 5 major car rental companies, with daily rates starting from around $34 for economy cars. Top options include:

• Alamo
• Hertz
• Enterprise Rent-A-Car
• Budget
• National
Which airports can I use when flying from St. Louis to Idaho Falls?
Flights from St. Louis to Idaho Falls usually depart from Lambert-St Louis (STL) and arrive at Idaho Falls Fanning Field (IDA).
Which airports do connecting flights from St. Louis to Idaho Falls pass through?
One-stop flights from St. Louis to Idaho Falls most commonly connect through:

• Denver Intl (DEN) - 78% of one-stop connections
• Salt Lake City (SLC) - 15% of one-stop connections
• Chicago O'Hare Intl (ORD) - 6% of one-stop connections
• Seattle/Tacoma Intl (SEA) - 1% of one-stop connections
Can I save money by using flexible dates for flights from St. Louis to Idaho Falls?
Yes. Flexible dates can save you up to 34% on flights from St. Louis to Idaho Falls. Tuesday is the cheapest departure day at $455 round-trip on average, while Wednesday is the most expensive at $683, a difference of $228.

KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.
How much time can I save by choosing a different layover airport from St. Louis to Idaho Falls?
Flying via Denver Intl (DEN) gives the shortest average 1-stop total travel time at 5h 31m, compared with 5h 43m via Salt Lake City (SLC) and 6h 51m via Chicago O'Hare Intl (ORD).
What is the time difference between St. Louis and Idaho Falls?
Idaho Falls is 1 hour behind St. Louis (Mountain Time vs Central Time). Plan for the time shift when scheduling connections or first-day activities.

If your dates are flexible, aim for a Tuesday departure and avoid flying on Wednesday. On this route, Tuesday flights average $455, about $228 less than Wednesday fares (33% savings) based on the last 12 months.
If you can choose when to travel, plan your St. Louis to Idaho Falls trip for March. Fares historically average $338 round-trip in that month - typically $472 less than the most expensive month, which is November (based on the last 12 months).
If you're arriving late at night and need somewhere to stay, check out these hotels close to Idaho Falls Fanning Field Airport.

• Tru by Hilton Idaho Falls
• Quality Inn Idaho Falls
• Comfort Suites Idaho Falls

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STL - IDA

$185 Find Cheap Flights from St. Louis to Idaho Falls - Compare and Save

Everything you should know

Cheap Flights from St. Louis to Idaho Falls (STL-IDA)

Recent round-trip flight deals from St. Louis to Idaho Falls

Recent one-way flight deals from St. Louis to Idaho Falls

Recent last minute flight deals from St. Louis to Idaho Falls

Price, demand and travel trends for St. Louis to Idaho Falls flights

How much is a round-trip flight from St. Louis to Idaho Falls?

What's the cheapest day of the week to fly from St. Louis to Idaho Falls?

Which airline is the cheapest to fly from St. Louis to Idaho Falls?

What’s the most popular layover airport when flying from St. Louis to Idaho Falls?

What is the cheapest layover airport when flying from St. Louis to Idaho Falls?

When flying from St. Louis to Idaho Falls which airport offers the shortest layover?

Key details for St. Louis to Idaho Falls flights

Low season

High season

Cheapest flight

When to book flights from St. Louis to Idaho Falls

Your St. Louis to Idaho Falls flight questions, answered

Your guide to booking St. Louis to Idaho Falls flights

More options for your flight from St. Louis to Idaho Falls

Complete your trip to Idaho Falls with a hotel stay or car rental

Information on your arrival and departure airports

Cabin class types available on flights from St. Louis to Idaho Falls

Find direct flights to and from St. Louis and Idaho Falls

Flights from domestic origins to Idaho Falls

Flights to other popular destinations

Find deals for your return flight