The cheapest times to fly from MSO to STL are

  • January 8th to February 4th
  • May 21st to July 1st
  • August 13th to November 18th

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from MSO to STL is late October to early November. Prices can be as high as $953 for Sunday flights during early to mid March, or as low as $294 for Wednesday flights around late October to early November.


When to Fly to St. Louis

Flying from Missoula, MT (MSO) to St. Louis, MO (STL) will usually cost between $303 to $593 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late October to early November with an average ticket price of $339. Due to high demand the most expensive time to fly is early to mid March, with an average price of $594. Planning your trip to low-cost times can easily save you $255 on economy flights and even more on first-class flights. Generally, any price below $438 can be considered a good price for a round-trip MSO to STL flight.

See below for a graph of average weekly prices for the MSO to STL route. All prices are for round-trip tickets in USD.

MSO to STL Flight Prices

Compared to other flights, the MSO to STL flight is much cheaper than the average and costs less than the average flight leaving from Missoula. The average price per mile (for a direct flight) is $0.21, which is below average.


Flight Prices by Day of the Week

Wednesday is usually the cheapest day to depart and return on this flight. Sundays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $137 (27%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Wednesday and returning a week later will cost an average of $366. Return trip prices are from the STL to MSO flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from MSO to STL can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 3 hour 22 minutes may not be realistic.


Flight Questions Answered

Still have questions about flying from MSO to STL? We’ve got answers.

Which airlines fly this route?

You can find 5 major airlines flying this route most often: Alaska, American, Delta, Frontier, United, and potentially more during busy seasons.

How far away is it from St Louis Lambert International Airport to Missoula International Airport?

The distance between the two airports is roughly 1321 miles or 2126 kilometers.

How long does it take to fly from MSO to STL?

The real-world flight time for a nonstop MSO to STL flight is about 3 hour 22 minutes.

How many flights go between Missoula, MT and St. Louis, MO?

It depends on the day of the week and the date, but a typical day might have around 59 available flights from MSO to STL.


Airport Location Info


Departing Airport

Origination code MSO
Origination airport name Missoula International Airport
City Missoula, MT
Country the United States
Latitude 46.9
Longitude -114.1

Return Airport

Destination code STL
Destination airport name St Louis Lambert International Airport
City St. Louis, MO
Country the United States
Latitude 38.7
Longitude -90.4


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.