$245+ Cheap flights from Missoula to St. Louis (MSO - STL)
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 10/5. Fares are subject to change and may not be available on all flights or dates of travel.
MSO — STL
Sep 16 — Sep 231
Round-trip
1 adult, Economy
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Find cheap flights from Missoula to St. Louis with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Missoula to St. Louis
Cheapest
Best
Last-minute
One-way
Cheapest flights from Missoula to St. LouisExplore 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 August 17, 2026.
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 August 17, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/295:13 pm -
2 stops15h 27m
Wed 11/45:32 pm -
1 stop23h 53m
Deal found 8/16![Multiple Airlines logo]()
$338
This American Airlines deal was found by Cheapflights users on 8/16. 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.
Thu 10/291:05 pm -
2 stops10h 14m
Wed 11/46:00 am -
2 stops15h 15m
Deal found 8/16![American Airlines logo]()
$454
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/227:00 am -
1 stop10h 38m
Thu 9/243:19 pm -
1 stop8h 42m
Deal found 8/13![Alaska Airlines logo]()
$461
This Delta deal was found by Cheapflights users on 8/15. 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 9/296:17 pm -
1 stop5h 27m
Thu 10/87:00 pm -
1 stop6h 31m
Deal found 8/15![Delta logo]()
$475
This Alaska Airlines deal was found by Cheapflights users on 8/14. 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 9/97:00 am -
1 stop10h 38m
Mon 9/143:19 pm -
1 stop8h 42m
Deal found 8/14![Alaska Airlines logo]()
$490
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/41:25 pm -
2 stops17h 59m
Sun 9/66:36 am -
1 stop6h 59m
Deal found 8/13![American Airlines logo]()
$498
This Kiwi.com deal was found by Cheapflights users on 8/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/139:49 pm -
1 stop12h 28m
Sun 9/2012:27 pm -
1 stop9h 32m
Deal found 8/16![Multiple Airlines logo]()
$499
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.
Tue 11/102:02 pm -
1 stop23h 23m
Sat 11/147:00 am -
1 stop9h 27m
Deal found 8/12![Alaska Airlines logo]()
$502
This American Airlines deal was found by Cheapflights users on 8/14. 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 10/191:48 pm -
1 stop20h 02m
Thu 10/226:32 am -
1 stop7h 46m
Deal found 8/14![American Airlines logo]()
$512
This Expedia deal was found by Cheapflights users on 8/17. 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.
Tue 9/294:16 pm -
2 stops23h 54m
Fri 10/94:42 pm -
1 stop20h 44m
Deal found 8/17![Alaska Airlines logo]()
$521
Best flights from Missoula to St. LouisDiscover carefully curated flight deals from Missoula to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 17, 2026.
Discover carefully curated flight deals from Missoula to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 17, 2026.
This Alaska Airlines deal was found by Cheapflights users on 8/14. 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.
Thu 1/286:40 am -
1 stop6h 46m
Mon 2/13:24 pm -
1 stop9h 35m
Deal found 8/14![Alaska Airlines logo]()
$461
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.
Fri 9/41:25 pm -
2 stops17h 59m
Sun 9/66:36 am -
1 stop6h 59m
Deal found 8/12![American Airlines logo]()
$498
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/272:40 pm -
1 stop5h 06m
Mon 8/3110:53 am -
2 stops11h 38m
Deal found 8/12![United Airlines logo]()
$526
This Delta deal was found by Cheapflights users on 8/17. 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 9/15:30 am -
1 stop7h 08m
Sat 9/55:00 pm -
1 stop7h 12m
Deal found 8/17![Delta logo]()
$550
This Alaska Airlines deal was found by Cheapflights users on 8/15. 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 9/97:00 am -
1 stop10h 38m
Mon 9/143:19 pm -
1 stop8h 42m
Deal found 8/15![Alaska Airlines logo]()
$490
This Delta deal was found by Cheapflights users on 8/17. 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 8/286:27 pm -
1 stop5h 14m
Mon 8/315:00 pm -
1 stop7h 12m
Deal found 8/17![Delta logo]()
$550
This United Airlines deal was found by Cheapflights users on 8/16. 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 9/96:15 am -
1 stop5h 25m
Mon 9/144:40 pm -
1 stop5h 54m
Deal found 8/16![United Airlines logo]()
$551
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.
Tue 11/101:02 pm -
2 stops24h 23m
Sat 11/147:00 am -
1 stop9h 27m
Deal found 8/12![Alaska Airlines logo]()
$507
This United Airlines deal was found by Cheapflights users on 8/15. 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 1/289:45 am -
1 stop5h 41m
Mon 2/11:30 pm -
1 stop5h 55m
Deal found 8/15![United Airlines logo]()
$551
Last-minute flights from Missoula to St. LouisDiscover last-minute flight deals from Missoula to St. Louis. Data last updated August 17, 2026 and is based on user searches.
Discover last-minute flight deals from Missoula to St. Louis. Data last updated August 17, 2026 and is based on user searches.
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/272:40 pm -
1 stop5h 06m
Mon 8/3110:53 am -
2 stops11h 38m
Deal found 8/12![United Airlines logo]()
$526
This United Airlines deal was found by Cheapflights users on 8/16. 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 9/312:25 pm -
1 stop8h 35m
Sun 9/64:40 pm -
1 stop5h 51m
Deal found 8/16![United Airlines logo]()
$541
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/41:25 pm -
2 stops17h 59m
Sun 9/66:36 am -
1 stop6h 59m
Deal found 8/13![American Airlines logo]()
$498
This Alaska Airlines deal was found by Cheapflights users on 8/14. 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 9/97:00 am -
1 stop10h 38m
Mon 9/143:19 pm -
1 stop8h 42m
Deal found 8/14![Alaska Airlines logo]()
$490
This Kiwi.com deal was found by Cheapflights users on 8/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/139:49 pm -
1 stop12h 28m
Sun 9/2012:27 pm -
1 stop9h 32m
Deal found 8/16![Multiple Airlines logo]()
$499
This Expedia 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/227:00 am -
1 stop10h 38m
Thu 9/243:19 pm -
1 stop8h 42m
Deal found 8/13![Alaska Airlines logo]()
$461
This Delta deal was found by Cheapflights users on 8/15. 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 9/296:17 pm -
1 stop5h 27m
Thu 10/87:00 pm -
1 stop6h 31m
Deal found 8/15![Delta logo]()
$475
This Expedia deal was found by Cheapflights users on 8/17. 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.
Tue 9/294:16 pm -
2 stops23h 54m
Fri 10/94:42 pm -
1 stop20h 44m
Deal found 8/17![Alaska Airlines logo]()
$521
One-way flights from Missoula to St. LouisSearch for one-way flight options from Missoula to St. Louis. Find affordable one-way fares based on user searches. Data last updated August 17, 2026.
Search for one-way flight options from Missoula to St. Louis. Find affordable one-way fares based on user searches. Data last updated August 17, 2026.
This Priceline 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/53:49 pm -
1 stop7h 10m
Deal found 8/12![Alaska Airlines logo]()
$245
This Kiwi.com deal was found by Cheapflights users on 8/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/309:52 pm -
2 stops20h 21m
Deal found 8/15![Multiple Airlines logo]()
$276
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/53:49 pm -
3 stops44h 21m
Deal found 8/12![Multiple Airlines logo]()
$552
Find 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 August 17, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $338 (Kiwi.com) |
One-way from | $245 (Priceline) |
Popular in | September |
Cheapest in | April |
Average price | $625 |
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 August 17, 2026.
Use the filters below to find and compare flights from Missoula to St. Louis that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
MissoulaSt. Louis
MSO Missoula Johnson-Bell Field - STL Lambert-St Louis
MSOSTL
Missoula Johnson-Bell Field
Thu 1/28
6:40 am-2:26 pm
1 stop6h 46m
Lambert-St Louis
Mon 2/1
3:24 pm-11:59 pm
1 stop9h 35m
$461
MissoulaSt. Louis
MSO Missoula Johnson-Bell Field - STL Lambert-St Louis
MSOSTL
Missoula Johnson-Bell Field
Wed 9/9
7:00 am-6:38 pm
1 stop10h 38m
Lambert-St Louis
Mon 9/14
3:19 pm-11:01 pm
1 stop8h 42m
$490
MissoulaSt. Louis
MSO Missoula Johnson-Bell Field - STL Lambert-St Louis
MSOSTL
Missoula Johnson-Bell Field
Fri 9/4
1:25 pm-8:24 am
2 stops17h 59m
Lambert-St Louis
Sun 9/6
6:36 am-12:35 pm
1 stop6h 59m
$498
MissoulaSt. Louis
MSO Missoula Johnson-Bell Field - STL Lambert-St Louis
MSOSTL
Missoula Johnson-Bell Field
Tue 11/10
1:02 pm-2:25 pm
2 stops24h 23m
Lambert-St Louis
Sat 11/14
7:00 am-3:27 pm
1 stop9h 27m
$507
MissoulaSt. Louis
MSO Missoula Johnson-Bell Field - STL Lambert-St Louis
MSOSTL
Missoula Johnson-Bell Field
Thu 8/27
2:40 pm-8:46 pm
1 stop5h 06m
Lambert-St Louis
Mon 8/31
10:53 am-9:31 pm
2 stops11h 38m
$526
MissoulaSt. Louis
MSO Missoula Johnson-Bell Field - STL Lambert-St Louis
MSOSTL
Missoula Johnson-Bell Field
Tue 9/1
5:30 am-1:38 pm
1 stop7h 08m
Lambert-St Louis
Sat 9/5
5:00 pm-11:12 pm
1 stop7h 12m
$550
MissoulaSt. Louis
MSO Missoula Johnson-Bell Field - STL Lambert-St Louis
MSOSTL
Missoula Johnson-Bell Field
Fri 8/28
6:27 pm-12:41 am
1 stop5h 14m
Lambert-St Louis
Mon 8/31
5:00 pm-11:12 pm
1 stop7h 12m
$550
Quickest round-trip
MissoulaSt. Louis
MSO Missoula Johnson-Bell Field - STL Lambert-St Louis
MSOSTL
Missoula Johnson-Bell Field
Wed 9/9
6:15 am-12:40 pm
1 stop5h 25m
Lambert-St Louis
Mon 9/14
4:40 pm-9:34 pm
1 stop5h 54m
$551
MissoulaSt. Louis
MSO Missoula Johnson-Bell Field - STL Lambert-St Louis
MSOSTL
Missoula Johnson-Bell Field
Thu 1/28
9:45 am-4:26 pm
1 stop5h 41m
Lambert-St Louis
Mon 2/1
1:30 pm-6:25 pm
1 stop5h 55m
$551
Cheapest one-way
Quickest one-way
MissoulaSt. Louis
MSO Missoula Johnson-Bell Field - STL Lambert-St Louis
MSOSTL
Missoula Johnson-Bell Field
Mon 10/5
3:49 pm-11:59 pm
1 stop7h 10m
$245
Showing 1-10 of 12 resultsSorted by cheapest first
Compare providers for flights from Missoula to St. Louis
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Missoula to St. Louis in August.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Missoula-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Missoula-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Missoula-St. Louis flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Missoula-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Missoula-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
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.
MSO-STL
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.
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 August 17, 2026.
See what other customers who have flown with 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.
Boarding
8.1
Comfort
7.8
Entertainment
7.8
Food
7.2
Crew
8.5
Overall
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Comfort
7.8
Entertainment
7.8
Food
7.2
Crew
8.5
Overall
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Comfort
7.8
Entertainment
7.8
Food
7.2
Crew
8.5
Overall
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
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.
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsEdwardsville
Fairview Heights
O'Fallon
Fenton
Swansea
Eureka
Maryland Heights
Collinsville
Wentzville
Glencoe
Chesterfield
Farmington
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Missoula and St. Louis flights
Browse other Missoula and St. Louis flight options. Last updated on August 17, 2026.
Other flights from Missoula
Browse through other flights departing from Missoula. Flights are based on user searches made on Cheapflights and were last updated on August 17, 2026.
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Check out other popular destinations found by fellow travelers in 2026
Other flights to St. Louis
Explore flights to St. Louis departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on August 17, 2026.
Top 2 airlines flying from Missoula to St. Louis
Discover the top 2 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 August 17, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$164 | Average$390 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$274 | Average$499 | FlexibilityNo cancel fee | On-time69% |