$119 Cheap Flights from Montrose (MTJ) to St. Louis (STL)

View $119 flight on Tue, Oct 28, 2025Opens in a new window

Popular airlines from Montrose Regional Airport (MTJ) to St. Louis Lambert Intl. Airport (STL)

Cheap Flights from Montrose to St. Louis (MTJ-STL)

Prices were available within the past 7 days and start at $119 for one-way flights and $249 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Thu, Dec 4 - Tue, Dec 9
MTJ
Montrose
STL
St. Louis
$249 Roundtrip, found 9 hours ago
$249
Roundtrip
found 9 hours ago
Select United flight, departing Thu, Dec 4 from Montrose to St. Louis, returning Tue, Dec 9, priced at $249 found 9 hours ago
American Airlines
Fri, Oct 3 - Sun, Oct 5
MTJ
Montrose
STL
St. Louis
$261 Roundtrip, found 4 days ago
$261
Roundtrip
found 4 days ago
Select American Airlines flight, departing Fri, Oct 3 from Montrose to St. Louis, returning Sun, Oct 5, priced at $261 found 4 days ago
Southwest Airlines
Thu, Oct 16 - Tue, Oct 21
MTJ
Montrose
STL
St. Louis
$263 Roundtrip, found 5 days ago
$263
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Thu, Oct 16 from Montrose to St. Louis, returning Tue, Oct 21, priced at $263 found 5 days ago
Southwest Airlines
Thu, Oct 16 - Tue, Oct 21
MTJ
Montrose
STL
St. Louis
$268 Roundtrip, found 5 days ago
$268
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Thu, Oct 16 from Montrose to St. Louis, returning Tue, Oct 21, priced at $268 found 5 days ago
Southwest Airlines
Thu, Oct 16 - Mon, Oct 20
MTJ
Montrose
STL
St. Louis
$271 Roundtrip, found 5 days ago
$271
Roundtrip
found 5 days ago
Select Southwest Airlines flight, departing Thu, Oct 16 from Montrose to St. Louis, returning Mon, Oct 20, priced at $271 found 5 days ago
American Airlines
Thu, Dec 4 - Tue, Dec 9
MTJ
Montrose
STL
St. Louis
$284 Roundtrip, found 9 hours ago
$284
Roundtrip
found 9 hours ago
Select American Airlines flight, departing Thu, Dec 4 from Montrose to St. Louis, returning Tue, Dec 9, priced at $284 found 9 hours ago
United
Thu, Dec 4 - Tue, Dec 9
MTJ
Montrose
STL
St. Louis
$286 Roundtrip, found 9 hours ago
$286
Roundtrip
found 9 hours ago
Select United flight, departing Thu, Dec 4 from Montrose to St. Louis, returning Tue, Dec 9, priced at $286 found 9 hours ago
Southwest Airlines
Thu, Dec 4 - Tue, Dec 9
MTJ
Montrose
STL
St. Louis
$289 Roundtrip, found 9 hours ago
$289
Roundtrip
found 9 hours ago
Select Southwest Airlines flight, departing Thu, Dec 4 from Montrose to St. Louis, returning Tue, Dec 9, priced at $289 found 9 hours ago
United
Sat, Sep 27 - Mon, Sep 29
MTJ
Montrose
STL
St. Louis
$291 Roundtrip, found 6 hours ago
$291
Roundtrip
found 6 hours ago
Select United flight, departing Sat, Sep 27 from Montrose to St. Louis, returning Mon, Sep 29, priced at $291 found 6 hours ago
United
Sat, Sep 27 - Mon, Sep 29
MTJ
Montrose
STL
St. Louis
$295 Roundtrip, found 6 hours ago
$295
Roundtrip
found 6 hours ago
Select United flight, departing Sat, Sep 27 from Montrose to St. Louis, returning Mon, Sep 29, priced at $295 found 6 hours ago

Alternative airports near St. Louis

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $383
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $383
Flights from Montrose (MTJ) to St. Louis (STL)
Origin airport
Montrose Regional
Destination airport
Lambert-St. Louis Intl.
Airlines serving
American Airlines, Southwest Airlines, United
Roundtrip price
$248
Distance
945 mi

Montrose to St. Louis Flights

The cheapest times to fly from Montrose to St. Louis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Montrose to St. Louis are during the month of December. You can find some of the cheapest flights from Montrose to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Montrose to St. Louis

Sunday is one of the best days to book for cheap flights from Montrose to St. Louis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Montrose to St. Louis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Montrose to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $119 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Montrose to St. Louis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Montrose to St. Louis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Montrose Regional Airport (MTJ) to Lambert-St. Louis Intl. Airport (STL) cost?
Get a cheap one-way flight from $119 or cheap return flight from $249 from Montrose Regional Airport (MTJ) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Montrose Regional Airport (MTJ) to Lambert-St. Louis Intl. Airport (STL)?
December is the least expensive month to fly from MTJ to STL. Traveling during an off-peak travel window is often the key to landing a great deal.
What is the cheapest airline that flies from Montrose Regional Airport (MTJ) to Lambert-St. Louis Intl. Airport (STL)?
To find the cheapest airline flying from MTJ to STL, use Expedia's filter tool. Tailor your search based on your travel style, such as preferred carriers and flight duration. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from Montrose Regional Airport (MTJ) to Lambert-St. Louis Intl. Airport (STL)?
There aren't any daily nonstop flights available from Montrose Regional Airport (MTJ) to Lambert-St. Louis Intl. Airport (STL). But you can choose flights with layovers. Filter your search on Expedia to include one or two stops, and you'll be cruising above the clouds in no time at all.
What day of the week has the most flights from MTJ to STL?
You'll typically find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can change from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Montrose Regional Airport (MTJ) to Lambert-St. Louis Intl. Airport (STL)?
Choose a flight from Montrose Regional Airport (MTJ) to Lambert-St. Louis Intl. Airport (STL) that leaves before 3 PM to reduce the risk of cancellations. Departures after this time are on average 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Montrose Regional Airport (MTJ) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Booking your flight from MTJ to STL right before your journey is typically more expensive. However, if you're flexible with your itinerary, you could land a cheap last-minute fare.
Is it cheaper to book a MTJ to STL flight and hotel package?
Compared with arranging hotels and flights separately, booking a MTJ to STL flight and hotel package with Expedia could result in significant savings. What's more, having everything in one convenient place will take the hassle out of planning your trip. Just secure your flights and select from our wide range of stays, then personalize your trip with other add-ons like tours and car rentals.
Can I cancel or change the date of my flight from Montrose Regional Airport (MTJ) to Lambert-St. Louis Intl. Airport (STL)?
Typically, you can modify or cancel your MTJ to STL flight. However, there may be additional charges, especially if your booking was made more than 24 hours ago. Double-check your itinerary for the airline's policies and fees on flight changes, or if you need more details, go to our Customer Service portal.

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*Available to One Key members.