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Idaho Falls

$144+ Cheap flights from Missouri to Idaho Falls (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 4/7. Fares are subject to change and may not be available on all flights or dates of travel.
STL — IDA
Mar 6 — Mar 131
Fri 3/6
Fri 3/13
1 adult, Economy
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Cheap flight deals from Missouri to Idaho Falls

Cheapest flights from Missouri to Idaho Falls
Explore the most affordable flight options available from Missouri to Idaho Falls. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 4, 2026.

This United Airlines deal was found by Cheapflights users on 2/1. 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 6/166:04 am
MCI
-
IDA
1 stop4h 51m
United Airlines
Tue 6/232:31 pm
IDA
-
MCI
1 stop5h 02m
United Airlines
Deal found 2/1$279
This United Airlines deal was found by Cheapflights users on 2/1. 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 3/38:41 am
STL
-
IDA
1 stop5h 49m
United Airlines
Tue 3/105:30 pm
IDA
-
STL
1 stop5h 04m
United Airlines
Deal found 2/1$279
This Alaska Airlines deal was found by Cheapflights users on 2/1. 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 3/47:00 am
STL
-
IDA
1 stop10h 43m
Alaska Airlines
Tue 3/105:20 pm
IDA
-
STL
1 stop19h 31m
Alaska Airlines
Deal found 2/1$287
This Orbitz deal was found by Cheapflights users on 2/2. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/25:10 pm
MCI
-
IDA
1 stop20h 56m
Alaska Airlines
Tue 6/94:08 pm
IDA
-
MCI
1 stop22h 58m
Alaska Airlines
Deal found 2/2$309
This United Airlines deal was found by Cheapflights users on 2/4. 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 7/235:15 am
STL
-
IDA
1 stop5h 40m
United Airlines
Mon 7/276:03 pm
IDA
-
STL
1 stop4h 55m
United Airlines
Deal found 2/4$329
This United Airlines deal was found by Cheapflights users on 2/4. 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 7/295:15 am
STL
-
IDA
1 stop5h 40m
United Airlines
Wed 8/52:31 pm
IDA
-
STL
1 stop5h 11m
United Airlines
Deal found 2/4$339
This United Airlines deal was found by Cheapflights users on 2/2. 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 3/38:41 am
STL
-
IDA
1 stop5h 49m
United Airlines
Wed 3/42:40 pm
IDA
-
STL
1 stop4h 46m
United Airlines
Deal found 2/2$341
This United Airlines deal was found by Cheapflights users on 1/31. 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 8/135:20 am
STL
-
IDA
1 stop5h 08m
United Airlines
Sat 8/222:35 pm
IDA
-
STL
1 stop5h 24m
United Airlines
Deal found 1/31$355
This Expedia deal was found by Cheapflights users on 2/3. 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 2/202:47 pm
STL
-
IDA
1 stop9h 49m
Alaska Airlines
Mon 2/238:00 am
IDA
-
STL
1 stop14h 59m
Alaska Airlines
Deal found 2/3$374
This American Airlines deal was found by Cheapflights users on 2/1. 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 8/287:01 am
STL
-
IDA
1 stop6h 15m
American Airlines
Sat 9/512:46 pm
IDA
-
STL
1 stop6h 33m
American Airlines
Deal found 2/1$375
This United Airlines deal was found by Cheapflights users on 2/3. 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 7/256:04 am
MCI
-
IDA
1 stop4h 51m
United Airlines
Fri 7/316:03 pm
IDA
-
MCI
1 stop4h 24m
United Airlines
Deal found 2/3$378
This United Airlines deal was found by Cheapflights users on 2/3. 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 5/215:15 am
STL
-
IDA
1 stop5h 40m
United Airlines
Wed 5/276:03 pm
IDA
-
STL
1 stop4h 55m
United Airlines
Deal found 2/3$390

Find flight deals from Missouri to Idaho Falls

Keep the following information in mind while searching for Missouri to Idaho Falls flight deals. Data was last updated February 4, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$279
(United Airlines)

One-way from

$144
(Alaska Airlines)

Popular in

November

Cheapest in

August

Average price

$482
Provider with most accurate pricing for Lambert-St Louis-Idaho Falls Fanning Field flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Idaho Falls Fanning Field flights.
Search Deals
From Missouri to Idaho Falls Fanning Field
Search Deals
One-way flight from Missouri to Idaho Falls Fanning Field
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($43 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($19 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Missouri 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 February 4, 2026.
Use the filters below to find and compare flights from Missouri to Idaho Falls that are best for you.

Fly from

Missouri

Fly to

Idaho Falls

Route

Depart

Return

Price

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Tue 3/3

8:41 am-1:30 pm

1 stop5h 49m

Idaho Falls Fanning Field

Tue 3/10

5:30 pm-11:34 pm

1 stop5h 04m

$279

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Wed 7/29

5:15 am-9:55 am

1 stop5h 40m

Idaho Falls Fanning Field

Wed 8/5

2:31 pm-8:42 pm

1 stop5h 11m

$339

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Tue 3/3

8:41 am-1:30 pm

1 stop5h 49m

Idaho Falls Fanning Field

Wed 3/4

2:40 pm-8:26 pm

1 stop4h 46m

$341

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Fri 2/20

2:47 pm-11:36 pm

1 stop9h 49m

Idaho Falls Fanning Field

Mon 2/23

8:00 am-11:59 pm

1 stop14h 59m

$374

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Thu 5/21

5:15 am-9:55 am

1 stop5h 40m

Idaho Falls Fanning Field

Wed 5/27

6:03 pm-11:58 pm

1 stop4h 55m

$390

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Tue 3/3

7:00 am-11:36 pm

1 stop17h 36m

Idaho Falls Fanning Field

Wed 3/4

5:20 pm-1:51 pm

1 stop19h 31m

$393

SpringfieldIdaho Falls

SGF - IDA

SGFIDA

Springfield-Branson

Tue 3/3

5:02 pm-8:58 pm

1 stop4h 56m

Idaho Falls Fanning Field

Tue 3/10

2:35 pm-8:21 pm

1 stop4h 46m

$404

Kansas CityIdaho Falls

MCI - IDA

MCIIDA

Kansas City

Tue 2/17

5:54 am-9:48 am

1 stop4h 54m

Idaho Falls Fanning Field

Sat 2/21

6:35 am-12:44 pm

1 stop5h 09m

$453

SpringfieldIdaho Falls

SGF - IDA

SGFIDA

Springfield-Branson

Wed 2/25

5:02 pm-9:48 am

1 stop17h 46m

Idaho Falls Fanning Field

Tue 3/3

2:40 pm-8:21 pm

1 stop4h 41m

$453

SpringfieldIdaho Falls

SGF - IDA

SGFIDA

Springfield-Branson

Mon 3/2

2:53 pm-1:30 pm

2 stops23h 37m

Idaho Falls Fanning Field

Mon 3/9

2:35 pm-8:21 pm

1 stop4h 46m

$508

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/2

Showing 1-10 of 28 results
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Best time to book a flight from Missouri to Idaho Falls

Have a flexible travel schedule? Discover the best time to fly to Idaho Falls from Missouri with our price prediction graph.
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 Missouri to Idaho Falls

What is the cheapest month to book a flight from Missouri to Idaho Falls?

Currently, March is the cheapest month in which you can book a flight from Missouri to Idaho Falls (average of $167). Flying from Missouri to Idaho Falls in November is currently the most expensive (average of $328). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Related info for your journey

Find useful and relevant information for your journey from Missouri to Idaho Falls. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Idaho Falls from Missouri?

    Idaho Falls Fanning Field (IDA), located 3.8 mi from the city center, is the airport you fly into when you book flights from Missouri to Idaho Falls.

  • How long is the flight from Missouri to Idaho Falls?

    Departing from Missouri to Idaho Falls will take you 5h 49m. Airlines will cover a distance of 1171 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the most popular routes from Missouri to Idaho Falls?

    The most popular route from Missouri to Idaho Falls is Kansas City - Idaho Falls Fanning Field. You may also consider Lambert-St Louis - Idaho Falls Fanning Field or Springfield-Branson - Idaho Falls Fanning Field.

  • Can I find deals for flights from Missouri to Idaho Falls that include hotel bookings?

    Yes. In addition to deals on Missouri to Idaho Falls flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Missouri to Idaho Falls?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Missouri to Idaho Falls.

  • Can I find deals for business class flights from Missouri to Idaho Falls?

    Yes. Cheapflights offers flight deals from Missouri to Idaho Falls by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Missouri to Idaho Falls?

    Currently, March is the cheapest month in which you can book a flight from Missouri to Idaho Falls (average of $167). Flying from Missouri to Idaho Falls in November is currently the most expensive (average of $328). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Idaho Falls?

Book flights to Idaho Falls if you plan to visit one of these locations
Rexburg

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Top 2 airlines flying from Missouri to Idaho Falls

Discover the top 2 airlines that operate flights from Missouri 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 February 4, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$163Average$411FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$235Average$522FlexibilityNo cancel feeOn-time69%

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