$231+ 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 12/24. Fares are subject to change and may not be available on all flights or dates of travel.
MSO — STL
Oct 7 — Oct 141
Round-trip
1 adult, Economy
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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
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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 September 7, 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 September 7, 2026.
This Alaska Airlines deal was found by Cheapflights users on 9/6. 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.
Sat 12/56:40 am -
1 stop6h 46m
Wed 12/93:24 pm -
1 stop9h 35m
Deal found 9/6![Alaska Airlines logo]()
$475
This American Airlines deal was found by Cheapflights users on 9/7. 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.
Sun 12/66:50 am -
1 stop6h 14m
Fri 12/117:26 am -
2 stops13h 49m
Deal found 9/7![American Airlines logo]()
$494
This Delta deal was found by Cheapflights users on 9/7. 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.
Thu 11/51:14 pm -
1 stop6h 55m
Mon 11/97:00 pm -
1 stop6h 22m
Deal found 9/7![Delta logo]()
$495
This United Airlines deal was found by Cheapflights users on 9/5. 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 10/142:38 pm -
1 stop8h 06m
Mon 11/28:50 am -
1 stop5h 41m
Deal found 9/5![United Airlines logo]()
$516
This Delta deal was found by Cheapflights users on 9/7. 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.
Sun 12/68:27 am -
2 stops7h 53m
Fri 12/1110:04 am -
2 stops10h 58m
Deal found 9/7![Delta logo]()
$519
This United Airlines deal was found by Cheapflights users on 9/7. 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 11/52:37 pm -
1 stop5h 22m
Mon 11/95:00 am -
2 stops9h 31m
Deal found 9/7![United Airlines logo]()
$521
This American Airlines deal was found by Cheapflights users on 9/6. 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 10/221:05 pm -
1 stop7h 54m
Sun 10/257:29 am -
1 stop6h 06m
Deal found 9/6![American Airlines logo]()
$534
This Delta deal was found by Cheapflights users on 9/6. 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.
Mon 9/216:17 pm -
1 stop5h 27m
Fri 9/255:47 pm -
1 stop6h 55m
Deal found 9/6![Delta logo]()
$570
This United Airlines deal was found by Cheapflights users on 9/2. 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.
Sat 12/56:15 am -
2 stops11h 01m
Wed 12/96:00 am -
2 stops13h 35m
Deal found 9/2![United Airlines logo]()
$575
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 September 7, 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 September 7, 2026.
This Alaska Airlines deal was found by Cheapflights users on 9/6. 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.
Sat 12/56:40 am -
1 stop6h 46m
Wed 12/93:24 pm -
1 stop9h 35m
Deal found 9/6![Alaska Airlines logo]()
$475
This American Airlines deal was found by Cheapflights users on 9/7. 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.
Sun 12/66:50 am -
1 stop6h 14m
Fri 12/115:00 am -
1 stop8h 36m
Deal found 9/7![American Airlines logo]()
$489
This Delta deal was found by Cheapflights users on 9/7. 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.
Thu 11/51:14 pm -
1 stop6h 55m
Mon 11/97:00 pm -
1 stop6h 22m
Deal found 9/7![Delta logo]()
$495
This United Airlines deal was found by Cheapflights users on 9/3. 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 12/52:27 pm -
1 stop5h 32m
Wed 12/96:00 am -
2 stops13h 35m
Deal found 9/3![United Airlines logo]()
$570
This Delta deal was found by Cheapflights users on 9/6. 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.
Mon 9/216:17 pm -
1 stop5h 27m
Fri 9/255:47 pm -
1 stop6h 55m
Deal found 9/6![Delta logo]()
$570
Last-minute flights from Missoula to St. LouisDiscover last-minute flight deals from Missoula to St. Louis. Data last updated September 7, 2026 and is based on user searches.
Discover last-minute flight deals from Missoula to St. Louis. Data last updated September 7, 2026 and is based on user searches.
This Alaska Airlines deal was found by Cheapflights users on 9/6. 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 9/147:36 pm -
1 stop18h 03m
Deal found 9/6![Alaska Airlines logo]()
$579
This Delta deal was found by Cheapflights users on 9/3. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/91:27 pm -
2 stops9h 15m
Mon 9/145:47 pm -
1 stop6h 55m
Deal found 9/3![Delta logo]()
$584
This United Airlines deal was found by Cheapflights users on 9/4. 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 9/107:00 am -
2 stops13h 36m
Sun 9/135:10 am -
1 stop5h 52m
Deal found 9/4![United Airlines logo]()
$674
This Delta deal was found by Cheapflights users on 9/6. 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.
Mon 9/216:17 pm -
1 stop5h 27m
Fri 9/255:47 pm -
1 stop6h 55m
Deal found 9/6![Delta logo]()
$570
This United Airlines deal was found by Cheapflights users on 9/6. 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.
Mon 9/217:00 am -
2 stops13h 36m
Fri 9/256:00 am -
1 stop6h 24m
Deal found 9/6![United Airlines logo]()
$665
This United Airlines deal was found by Cheapflights users on 9/5. 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 10/142:38 pm -
1 stop8h 06m
Mon 11/28:50 am -
1 stop5h 41m
Deal found 9/5![United Airlines logo]()
$516
This Delta deal was found by Cheapflights users on 9/5. 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.
Thu 10/156:23 pm -
1 stop5h 21m
Mon 11/22:25 pm -
2 stops9h 26m
Deal found 9/5![Delta logo]()
$575
This American Airlines deal was found by Cheapflights users on 9/6. 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 10/221:05 pm -
1 stop7h 54m
Sun 10/257:29 am -
1 stop6h 06m
Deal found 9/6![American Airlines logo]()
$534
This Kiwi.com deal was found by Cheapflights users on 9/6. 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 10/225:13 pm -
2 stops23h 27m
Sun 10/2512:16 pm -
1 stop8h 33m
Deal found 9/6![Multiple Airlines logo]()
$587
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 September 7, 2026.
Search for one-way flight options from Missoula to St. Louis. Find affordable one-way fares based on user searches. Data last updated September 7, 2026.
This Delta deal was found by Cheapflights users on 9/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/241:16 pm -
1 stop6h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![Delta logo]()
$231
This American Airlines deal was found by Cheapflights users on 9/2. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/247:00 am -
2 stops14h 22m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![American Airlines logo]()
$362
This United Airlines deal was found by Cheapflights users on 9/3. 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 12/246:00 am -
2 stops16h 38m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![United Airlines logo]()
$363
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 September 7, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $475 (Alaska Airlines) |
One-way from | $231 (Delta) |
Popular in | September |
Cheapest in | April |
Average price | $732 |
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 7,457,451 searches. Data last updated September 7, 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
Quickest round-trip
MissoulaSt. Louis
MSO Missoula Johnson-Bell Field - STL Lambert-St Louis
MSOSTL
Missoula Johnson-Bell Field
Thu 12/24
1:16 pm-8:56 pm
1 stop6h 40m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$231
MissoulaSt. Louis
MSO Missoula Johnson-Bell Field - STL Lambert-St Louis
MSOSTL
Missoula Johnson-Bell Field
Thu 12/24
6:00 am-11:38 pm
2 stops16h 38m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$363
MissoulaSt. Louis
MSO Missoula Johnson-Bell Field - STL Lambert-St Louis
MSOSTL
Missoula Johnson-Bell Field
Sat 12/5
6:40 am-2:26 pm
1 stop6h 46m
Lambert-St Louis
Wed 12/9
3:24 pm-11:59 pm
1 stop9h 35m
$475
MissoulaSt. Louis
MSO Missoula Johnson-Bell Field - STL Lambert-St Louis
MSOSTL
Missoula Johnson-Bell Field
Sun 12/6
6:50 am-2:04 pm
1 stop6h 14m
Lambert-St Louis
Fri 12/11
5:00 am-12:36 pm
1 stop8h 36m
$489
MissoulaSt. Louis
MSO Missoula Johnson-Bell Field - STL Lambert-St Louis
MSOSTL
Missoula Johnson-Bell Field
Thu 11/5
1:14 pm-9:09 pm
1 stop6h 55m
Lambert-St Louis
Mon 11/9
7:00 pm-12:22 am
1 stop6h 22m
$495
MissoulaSt. Louis
MSO Missoula Johnson-Bell Field - STL Lambert-St Louis
MSOSTL
Missoula Johnson-Bell Field
Sat 12/5
2:27 pm-8:59 pm
1 stop5h 32m
Lambert-St Louis
Wed 12/9
6:00 am-6:35 pm
2 stops13h 35m
$570
MissoulaSt. Louis
MSO Missoula Johnson-Bell Field - STL Lambert-St Louis
MSOSTL
Missoula Johnson-Bell Field
Mon 9/21
6:17 pm-12:44 am
1 stop5h 27m
Lambert-St Louis
Fri 9/25
5:47 pm-11:42 pm
1 stop6h 55m
$570
Sorted 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 September.
| 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.
Cheapflights Insights
Everything you need to know about your flight 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 September 7, 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.
Food
7.2
Overall
7.8
Boarding
8.1
Crew
8.5
Entertainment
7.8
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentJorge,Aug 2026
TPA - ATL
Food
7.2
Overall
7.8
Boarding
8.1
Crew
8.5
Entertainment
7.8
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentJorge,Aug 2026
TPA - ATL
Food
7.2
Overall
7.8
Boarding
8.1
Crew
8.5
Entertainment
7.8
Comfort
7.8
Reviews
1 / 20
8.0
ExcellentJorge,Aug 2026
TPA - ATL
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
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Missoula and St. Louis flights
Browse other Missoula and St. Louis flight options. Last updated on September 7, 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 September 7, 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 September 7, 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 7,457,451 searches. Data last updated September 7, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$164 | Average$390 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$274 | Average$506 | FlexibilityNo cancel fee | On-time69% |