Cheap Flights from St Louis to Missoula

Compare St Louis to Missoula flight deals

Find the cheapest month or even day of the year to fly to Missoula

Book the best Missoula fare with no extra fees

Flight deals from St Louis to Missoula

Looking for a cheap last-minute deal or the best return flight from St Louis Airport to Missoula Airport? If you want to travel next month, return fares start from ج.م.‏ 19,748. Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from St Louis to Missoula

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like St Louis to Missoula flights are currently cheapest in September.

St Louis to Missoula: Alternative routes

Compare routes from St Louis to Missoula below. You may find an airport to fly into that's cheaper, faster, or easier than Missoula.

St Louis to Missoula: Flight information

The things to know before you go.
Cheapest flight foundج.م.‏ 9,756
Cheapest month to flySeptember

Finding cheap flights from St Louis to Missoula: Frequently asked questions

The best price we found for a return flight from St Louis to Missoula is ج.م.‏ 18,745. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from St Louis to Missoula. But we found flights with one or more stops from ج.م.‏ 18,745.
As of April 2026, there are no flights flying from St Louis to Missoula.
The cheapest month to fly from St Louis to Missoula is usually August.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from St Louis Airport to Missoula Airport on Thursday, 20 August 2026.
No airlines currently offer direct flights between St Louis Airport and Missoula Airport. Most routes have one or more stops.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Missoula is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, United offers the cheapest flight tickets to Missoula.

Travelling from Lambert-St. Louis International Airport (STL) to Missoula International Airport (MSO): what you need to know

  • Leave enough time to catch your STL to MSO flight. As a rule of thumb, arrive at least two hours before international departures and an hour ahead for domestic flights.

  • Travelling during a peak time like July? Major public holidays and other popular periods can result in longer lines and delays at airport checkpoints. Play it safe and get there up to four hours ahead of international flights and two hours before domestic departures.

  • Think about adding a stopover when booking your ticket from Lambert-St. Louis International Airport to Missoula International Airport. Just uncheck 'Direct flights only' to break up your trip, or perhaps explore a new destination along the way. Here's where you can stop between STL and MSO:

    • Denver International Airport

    • Minneapolis-St. Paul International Airport

    • O'Hare International Airport

How to find the cheapest flights from Lambert-St. Louis International Airport (STL) to Missoula International Airport (MSO)

  • The cheapest price we've found for a one-way Lambert-St. Louis International Airport to Missoula International Airport flight is ج.م.‏ 9,756. A round-trip plane ticket right now is ج.م.‏ 18,745. Depending on the availability when you book, these fares can change.

  • Don't leave everything to the last moment. You're more likely to find cheap tickets from STL to MSO if you book ahead. Airlines often offer some fantastic early bird deals.

  • If you're willing to be flexible with your travel dates, try using the 'Whole month' tool. It'll show you the lowest price across each month when searching for a flight from Lambert-St. Louis International Airport to Missoula International Airport.

  • Landing cheap flights from STL to MSO is easy with Price Alerts. Simply set up one of these automatic alerts and we'll notify you as soon as a lower fare pops up.

  • Choose your preferred departure and arrival times, airlines and number of stops with the filters. Or sort your results by 'Cheapest' to find the best deals on flights from Lambert-St. Louis International Airport to Missoula International Airport.

Handy information about Lambert-St. Louis International Airport (STL)

Arriving at Missoula International Airport (MSO)

  • Reserve a hotel close to MSO if you have a late Lambert-St. Louis International Airport to Missoula International Airport flight. Pick one of these options and avoid the hassle of a long transfer:

  • Fast-track your adventure by picking up a Missoula International Airport rental car. Grab a set of wheels from Budget, Dollar or Hertz to explore Missoula and beyond.

  • Improve your chances of getting the best possible rate by booking as early as possible. Reserving your vehicle from Missoula International Airport several weeks in advance is a good move.

Getting from Missoula International Airport (MSO) to central Missoula

  • MSO is located at 5225 Highway 10 West.

  • Missoula International Airport is approximately 11 kilometres from central Missoula. The drive time takes about 10 minutes.

  • When travelling by public transport, expect a journey time of about 35 minutes.

When to fly to Missoula International Airport (MSO)

  • July is the busiest month for flights from Lambert-St. Louis International Airport to Missoula International Airport. For a quieter experience, head to Missoula in February.

  • Lock in your flight from Lambert-St. Louis International Airport to Missoula International Airport for July if you'd like to go to Missoula during its warmest month. You can expect temperatures of between 8ºC and 33ºC.

  • If you'd rather travel in cooler conditions, search for a cheap ticket from STL to MSO in December. Average temperatures are between -15ºC and 3ºC then.

Explore more of United States

  • You've seen Missoula, now it's time to explore other corners of United States. Travel around 274 kilometres west to Spokane to tick off its leading attractions. From Manito Park to Northwest Museum of Arts & Culture and Spokane Falls, you'll have a packed itinerary ahead.

  • Boise is another sought-after destination in United States and is around 402 kilometres south-west of Missoula. No journey is complete without experiencing Idaho State Capitol Building, Old Idaho Penitentiary and Zoo Boise.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.