STL - IDA

$165 Find Cheap Flights from St. Louis to Idaho Falls - Compare and Save

1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$329
Typical prices: $451-$683
Delta
Sun 10/7Fri 10/12
STL - IDA • 1 stop
Cheapest one-way
$165
Typical prices: $239-$355
American Airlines
Sun 12/2
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
Insights
When to travel
March
Cheapest • 34% price drop
August
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Seattle/Tacoma Intl (SEA)
Cheapest • Avg $367 (round-trip)
Denver Intl (DEN)
Shortest trip • 5h 31m (one-way)
Insights
Insights
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We hope you love your trip to Idaho Falls!
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Booking Insights
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.

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

Wed, Oct 7 - Mon, Oct 12
Delta Logo
7:45 am - 12:22 pmSTL  Lambert-St Louis-IDA Idaho Falls Fanning Field
5h 37m1 stop Salt Lake City
Delta Logo
6:56 pm - 12:44 amIDA  Idaho Falls Fanning Field-STL Lambert-St Louis
4h 48m1 stop Salt Lake City
$329Delta
Wed, Sep 16 - Mon, Sep 21
Multiple Airlines Logo
8:10 pm - 12:04 pmSTL  Lambert-St Louis-IDA Idaho Falls Fanning Field
40h 54m2 stops Denver Intl Las Vegas Harry Reid Intl
Multiple Airlines Logo
6:21 pm - 11:32 amIDA  Idaho Falls Fanning Field-STL Lambert-St Louis
16h 11m1 stop Las Vegas Harry Reid Intl
$358Multiple Airlines
Thu, Sep 10 - Thu, Sep 17
United Airlines Logo
4:40 pm - 9:18 pmSTL  Lambert-St Louis-IDA Idaho Falls Fanning Field
5h 38m1 stop Denver Intl
United Airlines Logo
4:04 pm - 11:31 pmIDA  Idaho Falls Fanning Field-STL Lambert-St Louis
6h 27m1 stop Denver Intl
$387United Airlines
Thu, Oct 1 - Mon, Oct 5
Alaska Airlines Logo
3:09 pm - 10:56 pmSTL  Lambert-St Louis-IDA Idaho Falls Fanning Field
8h 47m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
1:58 pm - 11:59 pmIDA  Idaho Falls Fanning Field-STL Lambert-St Louis
9h 01m1 stop Seattle/Tacoma Intl
$409Alaska Airlines
Fri, Oct 9 - Tue, Oct 13
Alaska Airlines Logo
7:02 am - 3:20 pmSTL  Lambert-St Louis-IDA Idaho Falls Fanning Field
9h 18m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
1:58 pm - 11:59 pmIDA  Idaho Falls Fanning Field-STL Lambert-St Louis
9h 01m1 stop Seattle/Tacoma Intl
$409Alaska Airlines
Sat, Jan 9 - Tue, Jan 12
United Airlines Logo
4:30 pm - 9:08 pmSTL  Lambert-St Louis-IDA Idaho Falls Fanning Field
5h 38m1 stop Denver Intl
United Airlines Logo
2:35 pm - 8:59 pmIDA  Idaho Falls Fanning Field-STL Lambert-St Louis
5h 24m1 stop Denver Intl
$419United Airlines
Sat, Feb 6 - Tue, Feb 9
United Airlines Logo
4:30 pm - 9:08 pmSTL  Lambert-St Louis-IDA Idaho Falls Fanning Field
5h 38m1 stop Denver Intl
United Airlines Logo
2:35 pm - 8:59 pmIDA  Idaho Falls Fanning Field-STL Lambert-St Louis
5h 24m1 stop Denver Intl
$419United Airlines
Thu, Oct 1 - Mon, Oct 5
Delta Logo
2:25 pm - 6:17 pmSTL  Lambert-St Louis-IDA Idaho Falls Fanning Field
4h 52m1 stop Salt Lake City
Delta Logo
6:57 pm - 12:44 amIDA  Idaho Falls Fanning Field-STL Lambert-St Louis
4h 47m1 stop Salt Lake City
$494Delta
Thu, Oct 8 - Mon, Oct 12
Delta Logo
12:00 pm - 10:10 pmSTL  Lambert-St Louis-IDA Idaho Falls Fanning Field
11h 10m2 stops Atlanta Hartsfield-Jackson Salt Lake City
Delta Logo
6:56 pm - 12:44 amIDA  Idaho Falls Fanning Field-STL Lambert-St Louis
4h 48m1 stop Salt Lake City
$734Delta
Thu, Oct 8 - Mon, Oct 12
Delta Logo
7:45 am - 12:22 pmSTL  Lambert-St Louis-IDA Idaho Falls Fanning Field
5h 37m1 stop Salt Lake City
Delta Logo
6:56 pm - 12:44 amIDA  Idaho Falls Fanning Field-STL Lambert-St Louis
4h 48m1 stop Salt Lake City
$817Delta
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 from St. Louis to Idaho Falls with more confidence.

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

Round-trip flights from St. Louis to Idaho Falls start at $329. Prices are below average for this route right now, with typical round-trip fares ranging from $451 to $683. The lowest price found in the past 5 days was $329 on Delta.

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

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

Find deals

Key details for St. Louis to Idaho Falls flights

Low season

January

Cheapest flight

$165
Most popular time to fly and prices are also 2% lower on average.
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

Your St. Louis to Idaho Falls flight questions, answered

Find helpful route details based on KAYAK data, including flight times, airports, airlines and booking questions.

  • 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) - 79% of one-stop connections
    • Salt Lake City (SLC) - 17% of one-stop connections
    • Chicago O'Hare Intl (ORD) - 3% of one-stop connections
    • Seattle/Tacoma Intl (SEA) - 1% of one-stop connections

    Denver Intl (DEN) handles the largest share of one-stop connections on this route.

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

    Yes. Being flexible with your travel dates can save you up to 34% on the St. Louis to Idaho Falls route. 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 0h 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 $329 to $1,740. 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 in line with typical prices for this route. Average one-way fares are about $268.

  • 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 39m 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.

Your guide to booking St. Louis to Idaho Falls flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your dates can be flexible, aim for a Tuesday departure instead of Wednesday. On this route, Tuesday flights average $455 - about $228 less than Wednesday (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.
    - Best Western Driftwood Inn
    - Hampton Inn Idaho Falls/Airport
    - Hilton Garden Inn Idaho Falls

Everything you need to know for your flight from St. Louis to Idaho Falls

Information on your arrival and departure airports

St. Louis (STL)
Idaho Falls (IDA)