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Missoula

$176+ Cheap flights from St. Louis to Missoula (STL - MSO)

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 9/1. Fares are subject to change and may not be available on all flights or dates of travel.
STL — MSO
Aug 18 — Aug 251
Mon 8/18
Mon 8/25
1 adult, Economy
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Cheap flight deals from St. Louis to Missoula

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Missoula (MSO). 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 August 13, 2025.

Round-trip from

$329
(American Airlines)

One-way from

$176
(American Airlines)

Popular in

December

Cheapest in

April

Average price

$450
From Lambert-St Louis to Missoula Johnson-Bell Field
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One-way flight from Lambert-St Louis to Missoula Johnson-Bell Field
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Highest demand for flights based on searches. 3% potential increase in price ($19 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($16 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from St. Louis to Missoula

Cheapest flights from St. Louis to Missoula
Explore the most affordable flight options available from St. Louis to Missoula. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 13, 2025.

This American Airlines deal was found by Cheapflights users on 8/11. 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 9/276:10 amSTL - MSO
1 stop18h 08mAmerican Airlines
Wed 10/16:40 amMSO - STL
1 stop14h 13mAmerican Airlines
Deal found 8/11$329
This American Airlines deal was found by Cheapflights users on 8/12. 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 9/166:10 amSTL - MSO
1 stop18h 08mAmerican Airlines
Tue 9/231:51 pmMSO - STL
1 stop7h 59mAmerican Airlines
Deal found 8/12$340
This Delta deal was found by Cheapflights users on 8/12. 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 9/96:45 pmSTL - MSO
1 stop5h 25mDelta
Tue 9/166:20 pmMSO - STL
1 stop5h 18mDelta
Deal found 8/12$351
This Delta deal was found by Cheapflights users on 8/12. 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 9/1611:04 amSTL - MSO
2 stops13h 42mDelta
Tue 9/235:30 amMSO - STL
2 stops12h 35mDelta
Deal found 8/12$361
This Alaska Airlines deal was found by Cheapflights users on 8/12. 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.
Mon 9/83:35 pmSTL - MSO
1 stop9h 52mAlaska Airlines
Mon 9/156:40 pmMSO - STL
1 stop18h 59mAlaska Airlines
Deal found 8/12$370
This Delta deal was found by Cheapflights users on 8/11. 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 9/273:55 pmSTL - MSO
2 stops8h 51mDelta
Wed 10/15:30 amMSO - STL
1 stop7h 03mDelta
Deal found 8/11$376
This Alaska Airlines deal was found by Cheapflights users on 8/13. 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 10/317:00 amSTL - MSO
2 stops31h 19mAlaska Airlines
Mon 11/34:12 pmMSO - STL
1 stop6h 47mAlaska Airlines
Deal found 8/13$378
This Delta deal was found by Cheapflights users on 8/10. 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.
Fri 10/177:30 pmSTL - MSO
1 stop5h 47mDelta
Sun 10/196:20 pmMSO - STL
1 stop5h 04mDelta
Deal found 8/10$391
This Alaska Airlines deal was found by Cheapflights users on 8/13. 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.
Tue 9/96:00 amSTL - MSO
1 stop7h 32mAlaska Airlines
Tue 9/166:40 pmMSO - STL
1 stop21h 54mAlaska Airlines
Deal found 8/13$396

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Missoula 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 August 13, 2025.
Use the filters below to find and compare flights from St. Louis to Missoula that are best for you.

Fly from

St. Louis

Fly to

Missoula

Route

Depart

Return

Price

St. LouisMissoula

STL - MSO

STLMSO

Lambert-St Louis

Sat 9/27

6:10 am-11:18 pm

1 stop18h 08m

Missoula Johnson-Bell Field

Wed 10/1

6:40 am-9:53 pm

1 stop14h 13m

$329

St. LouisMissoula

STL - MSO

STLMSO

Lambert-St Louis

Tue 9/16

6:10 am-11:18 pm

1 stop18h 08m

Missoula Johnson-Bell Field

Tue 9/23

1:51 pm-10:50 pm

1 stop7h 59m

$340

St. LouisMissoula

STL - MSO

STLMSO

Lambert-St Louis

Wed 10/15

7:30 pm-12:17 am

1 stop5h 47m

Missoula Johnson-Bell Field

Wed 10/22

6:20 pm-12:24 am

1 stop5h 04m

$351

St. LouisMissoula

STL - MSO

STLMSO

Lambert-St Louis

Tue 9/9

5:30 pm-11:49 pm

1 stop7h 19m

Missoula Johnson-Bell Field

Tue 9/16

6:20 pm-12:38 am

1 stop5h 18m

$351

St. LouisMissoula

STL - MSO

STLMSO

Lambert-St Louis

Wed 10/1

7:00 pm-12:18 am

1 stop6h 18m

Missoula Johnson-Bell Field

Wed 10/8

6:20 pm-12:24 am

1 stop5h 04m

$351

St. LouisMissoula

STL - MSO

STLMSO

Lambert-St Louis

Tue 9/16

11:04 am-11:46 pm

2 stops13h 42m

Missoula Johnson-Bell Field

Tue 9/23

5:45 am-11:30 am

1 stop4h 45m

$356

St. LouisMissoula

STL - MSO

STLMSO

Lambert-St Louis

Tue 9/16

6:10 am-12:20 pm

1 stop7h 10m

$176

St. LouisMissoula

STL - MSO

STLMSO

Lambert-St Louis

Mon 9/1

7:01 am-1:01 pm

1 stop7h 00m

$176

St. LouisMissoula

STL - MSO

STLMSO

Lambert-St Louis

Tue 9/16

11:04 am-11:46 pm

2 stops13h 42m

$181

St. LouisMissoula

STL - MSO

STLMSO

Lambert-St Louis

Sun 8/17

2:36 pm-11:54 am

2 stops22h 18m

$198

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/12

Showing 1-10 of 16 results
1
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Best time to book a flight from St. Louis to Missoula

Have a flexible travel schedule? Discover the best time to fly to Missoula from St. Louis 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 St. Louis to Missoula

What is the cheapest month to book a flight from St. Louis to Missoula?

Currently, October is the cheapest month in which you can book a flight from St. Louis to Missoula (average of $365). Flying from St. Louis to Missoula in March is currently the most expensive (average of $506). 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.

What is the cheapest time of day to fly from STL to MSO?

Find hourly flight availability from St. Louis to Missoula. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 13, 2025.

One of the essential ways to save on airfare from St. Louis to Missoula is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 65% on airfare.

How much does it cost to fly round-trip from St. Louis to Missoula?

Reviews of airlines servicing Missoula

Get insights into the airlines that provide service to Missoula. 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 Missoula. Reviews last updated August 13, 2025.
See what other customers who have flown with Alaska Airlines, Delta, and United Airlines from St. Louis to Missoula have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

Food

7.1

Entertainment

7.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

BOI - LAX

flying in first class, my husband froze the entire flight and was miserable. first class does not offer blankets or any entertainment. (TV etc)
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

Food

7.1

Entertainment

7.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

BOI - LAX

flying in first class, my husband froze the entire flight and was miserable. first class does not offer blankets or any entertainment. (TV etc)
Delta
8.0
Very good
7,979 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

Food

7.1

Entertainment

7.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

BOI - LAX

flying in first class, my husband froze the entire flight and was miserable. first class does not offer blankets or any entertainment. (TV etc)
United Airlines
7.4
Good
8,920 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

Food

7.1

Entertainment

7.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

BOI - LAX

flying in first class, my husband froze the entire flight and was miserable. first class does not offer blankets or any entertainment. (TV etc)
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

Food

7.1

Entertainment

7.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2025

BOI - LAX

flying in first class, my husband froze the entire flight and was miserable. first class does not offer blankets or any entertainment. (TV etc)

Related info for your journey

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

  • What are the cheapest airlines flying from St. Louis to Missoula round-trip?

    Cheapflights users have booked flights from St. Louis to Missoula round-trip from $329. Another airline that can offer you cheap pricing is Delta. These flights start at 29% lower than the current average price 3 months from now.

  • Can I find deals for flights from St. Louis to Missoula that include hotel bookings?

    Yes. In addition to deals on St. Louis to Missoula flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Missoula?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Missoula.

  • Can I find deals for business class flights from St. Louis to Missoula?

    Yes. Cheapflights offers flight deals from St. Louis to Missoula 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 St. Louis to Missoula?

    Currently, October is the cheapest month in which you can book a flight from St. Louis to Missoula (average of $365). Flying from St. Louis to Missoula in March is currently the most expensive (average of $506). 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

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Alternative routes for St. Louis to Missoula

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Top 4 airlines flying from St. Louis to Missoula

Discover the top 4 airlines that operate flights from St. Louis to Missoula. 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 August 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$288Average$569FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$294Average$475FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$325Average$528FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$371Average$574FlexibilityNo cancel feeOn-time69%

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