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$343+ Cheap flights from Missoula to St. Louis (MSO - STL)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/25. Fares are subject to change and may not be available on all flights or dates of travel.
MSO — STL
Aug 4 — Aug 111
Mon 8/4
Mon 8/11
1 adult, Economy
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Cheap flight deals from Missoula to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Missoula (MSO) to St. Louis (STL). 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 July 30, 2025.

Round-trip from

$343
(American Airlines)

Popular in

March

Cheapest in

April

Average price

$390
From Missoula Johnson-Bell Field to Lambert-St Louis
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High demand for flights, 2% potential price rise
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Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find flight deals from Missoula to St. Louis

Cheapest flights from Missoula to St. Louis
Explore the most affordable flight options available from Missoula to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 30, 2025.

This American Airlines deal was found by Cheapflights users on 7/30. 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.
Mon 8/251:51 pmMSO - STL
1 stop8h 23mAmerican Airlines
Wed 8/276:45 amSTL - MSO
1 stop9h 38mAmerican Airlines
Deal found 7/30$343
This Delta deal was found by Cheapflights users on 7/30. 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.
Wed 12/38:00 amMSO - STL
2 stops7h 51mDelta
Sun 12/76:59 pmSTL - MSO
1 stop6h 33mDelta
Deal found 7/30$348
This Alaska Airlines deal was found by Cheapflights users on 7/30. 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 8/254:14 pmMSO - STL
1 stop6h 45mAlaska Airlines
Wed 8/276:00 amSTL - MSO
2 stops18h 59mAlaska Airlines
Deal found 7/30$382
This United Airlines deal was found by Cheapflights users on 7/29. 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 8/135:20 pmMSO - STL
1 stop5h 39mUnited Airlines
Sun 8/175:00 amSTL - MSO
1 stop7h 38mUnited Airlines
Deal found 7/29$411
This Mytrip deal was found by Cheapflights users on 7/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/89:54 pmMSO - STL
3 stops37h 16mMultiple Airlines
Thu 8/142:30 pmSTL - MSO
3 stops27h 53mMultiple Airlines
Deal found 7/30$529

Cheapflights Fare Finder

 
Customize your flight search to find flights from Missoula to St. Louis 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 July 30, 2025.
Use the filters below to find and compare flights from Missoula to St. Louis that are best for you.

Fly from

Missoula

Fly to

St. Louis

Route

Depart

Return

Price

MissoulaSt. Louis

MSO - STL

MSOSTL

Missoula Johnson-Bell Field

Mon 8/25

1:51 pm-11:14 pm

1 stop8h 23m

Lambert-St Louis

Wed 8/27

6:45 am-3:23 pm

1 stop9h 38m

$343

MissoulaSt. Louis

MSO - STL

MSOSTL

Missoula Johnson-Bell Field

Wed 12/3

8:00 am-4:51 pm

2 stops7h 51m

Lambert-St Louis

Sun 12/7

6:59 pm-12:32 am

1 stop6h 33m

$348

MissoulaSt. Louis

MSO - STL

MSOSTL

Missoula Johnson-Bell Field

Mon 8/25

4:14 pm-11:59 pm

1 stop6h 45m

Lambert-St Louis

Wed 8/27

6:00 am-11:59 pm

2 stops18h 59m

$382

MissoulaSt. Louis

MSO - STL

MSOSTL

Missoula Johnson-Bell Field

Wed 8/13

5:20 pm-11:59 pm

1 stop5h 39m

Lambert-St Louis

Sun 8/17

5:00 am-11:38 am

1 stop7h 38m

$411

MissoulaSt. Louis

MSO - STL

MSOSTL

Missoula Johnson-Bell Field

Wed 8/13

10:40 am-1:32 pm

3 stops25h 52m

Lambert-St Louis

Sun 8/17

2:30 pm-4:50 pm

3 stops27h 20m

$574

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

Best time to book a flight from Missoula to St. Louis

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

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

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated July 30, 2025.
See what other customers who have flown with Alaska Airlines, Delta, and United Airlines from Missoula to St. Louis 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

Crew

8.5

Comfort

7.8

Overall

8.0

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Crew

8.5

Comfort

7.8

Overall

8.0

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Delta
8.0
Very good
7,980 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Crew

8.5

Comfort

7.8

Overall

8.0

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
United Airlines
7.4
Good
8,896 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Crew

8.5

Comfort

7.8

Overall

8.0

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Crew

8.5

Comfort

7.8

Overall

8.0

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

Related info for your journey

Find useful and relevant information for your journey from Missoula to St. Louis. 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 Missoula to St. Louis round-trip?

    Our cheapest airline available from Missoula to St. Louis is American Airlines. Our recent data shows that you can find tickets from as low as $343 on this airline. Additional options worth looking into are Delta and Alaska Airlines, starting at $348 and $382 round-trip. These flights start at 25% lower than the current average price 3 months from now.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Missoula to St. Louis (average of $311). Flying from Missoula to St. Louis in March is currently the most expensive (average of $356). 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 St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
O'Fallon
Maryland Heights
Fairview Heights
Collinsville
Eureka
St. Peters
Glencoe
Alton
Chesterfield
Festus
Farmington

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Top 3 airlines flying from Missoula to St. Louis

Discover the top 3 airlines that operate flights from Missoula to St. Louis. 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 July 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest$280Average$441FlexibilityNo cancel feeOn-time75%
DeltaCheapest$305Average$415FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$318Average$488FlexibilityNo cancel feeOn-time69%

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