$189 Cheap Flights from Great Falls (GTF) to St. Louis (STL)

View $189 flight on Tue, Feb 24, 2026Opens in a new window

Popular airlines from Great Falls, MT (GTF-Great Falls Intl.) to St. Louis Lambert Intl. Airport (STL)

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Cheap Flights from Great Falls to St. Louis (GTF-STL)

Prices were available within the past 7 days and start at $189 for one-way flights and $312 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Hawaiian Airlines
Mon, Dec 8 - Sat, Dec 13
GTF
Great Falls
STL
St. Louis
$312 Roundtrip, found 1 hour ago
$312
Roundtrip
found 1 hour ago
Select Hawaiian Airlines flight, departing Mon, Dec 8 from Great Falls to St. Louis, returning Sat, Dec 13, priced at $312 found 1 hour ago
Hawaiian Airlines
Wed, Dec 10 - Sat, Dec 13
GTF
Great Falls
STL
St. Louis
$322 Roundtrip, found 1 hour ago
$322
Roundtrip
found 1 hour ago
Select Hawaiian Airlines flight, departing Wed, Dec 10 from Great Falls to St. Louis, returning Sat, Dec 13, priced at $322 found 1 hour ago
Hawaiian Airlines
Mon, Dec 8 - Sun, Dec 14
GTF
Great Falls
STL
St. Louis
$332 Roundtrip, found 1 hour ago
$332
Roundtrip
found 1 hour ago
Select Hawaiian Airlines flight, departing Mon, Dec 8 from Great Falls to St. Louis, returning Sun, Dec 14, priced at $332 found 1 hour ago
Hawaiian Airlines
Wed, Dec 10 - Sun, Dec 14
GTF
Great Falls
STL
St. Louis
$342 Roundtrip, found 1 hour ago
$342
Roundtrip
found 1 hour ago
Select Hawaiian Airlines flight, departing Wed, Dec 10 from Great Falls to St. Louis, returning Sun, Dec 14, priced at $342 found 1 hour ago
Hawaiian Airlines
Tue, Dec 23 - Tue, Jan 6
GTF
Great Falls
STL
St. Louis
$352 Roundtrip, found 6 days ago
$352
Roundtrip
found 6 days ago
Select Hawaiian Airlines flight, departing Tue, Dec 23 from Great Falls to St. Louis, returning Tue, Jan 6, priced at $352 found 6 days ago
Alaska Airlines
Sat, Feb 14 - Sat, Feb 21
GTF
Great Falls
STL
St. Louis
$352 Roundtrip, found 2 days ago
$352
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Sat, Feb 14 from Great Falls to St. Louis, returning Sat, Feb 21, priced at $352 found 2 days ago
Hawaiian Airlines
Tue, Dec 23 - Sat, Jan 10
GTF
Great Falls
STL
St. Louis
$362 Roundtrip, found 6 days ago
$362
Roundtrip
found 6 days ago
Select Hawaiian Airlines flight, departing Tue, Dec 23 from Great Falls to St. Louis, returning Sat, Jan 10, priced at $362 found 6 days ago
Hawaiian Airlines
Wed, Dec 24 - Sat, Jan 10
GTF
Great Falls
STL
St. Louis
$372 Roundtrip, found 6 days ago
$372
Roundtrip
found 6 days ago
Select Hawaiian Airlines flight, departing Wed, Dec 24 from Great Falls to St. Louis, returning Sat, Jan 10, priced at $372 found 6 days ago
Delta
Sat, Nov 1 - Sat, Nov 15
GTF
Great Falls
STL
St. Louis
$378 Roundtrip, found 1 day ago
$378
Roundtrip
found 1 day ago
Select Delta flight, departing Sat, Nov 1 from Great Falls to St. Louis, returning Sat, Nov 15, priced at $378 found 1 day ago
United
Fri, Nov 7 - Tue, Nov 11
GTF
Great Falls
STL
St. Louis
$428 Roundtrip, found 3 days ago
$428
Roundtrip
found 3 days ago
Select United flight, departing Fri, Nov 7 from Great Falls to St. Louis, returning Tue, Nov 11, priced at $428 found 3 days 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 $468
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $468

Frequently asked questions

How much does a flight from Great Falls Intl. Airport (GTF) to Lambert-St. Louis Intl. Airport (STL) cost?
Snag a cheap one-way flight from $189 or cheap return flight from $312 from Great Falls Intl. Airport (GTF) 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 Great Falls Intl. Airport (GTF) to Lambert-St. Louis Intl. Airport (STL)?
December is the least expensive month to fly from GTF to STL. Avoiding peak travel times is often the key to scoring lower fares.
What is the cheapest airline that flies from Great Falls Intl. Airport (GTF) to Lambert-St. Louis Intl. Airport (STL)?
Use the filters on Expedia to compare airlines and find the cheapest carrier that'll take you from GTF to STL. Then, sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Great Falls Intl. Airport (GTF) to Lambert-St. Louis Intl. Airport (STL)?
There are no daily direct flights departing from Great Falls Intl. Airport (GTF) to Lambert-St. Louis Intl. Airport (STL). But you can book flights with layovers. Filter your search on Expedia to include one or two stops, and you'll be on your way before you know it.
What day of the week has the most flights from GTF to STL?
Generally you'll find the most flight options available on a Friday. Tuesdays tend to be the quietest.* However, this can change based on the airline, time of year and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Great Falls Intl. Airport (GTF) to Lambert-St. Louis Intl. Airport (STL)?
Choose a flight from Great Falls Intl. Airport (GTF) to Lambert-St. Louis Intl. Airport (STL) that leaves before 3 PM to reduce the likelihood of delays and cancellations. Departures after this hour have a 22% higher chance of being canceled, on average.**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 Great Falls Intl. Airport (GTF) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Holding off until right before your break to book a flight from GTF to STL often results in higher prices. Although you may find some last-minute offers, they aren't always guaranteed. Be flexible with your itinerary for the best chance of getting a bargain.
Is it cheaper to book a GTF to STL flight and hotel package?
Opting for a GTF to STL flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your trip in one place. Select from our extensive range of accommodations and then add car rentals, activities and flights to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Great Falls Intl. Airport (GTF) to Lambert-St. Louis Intl. Airport (STL)?
You can usually cancel or reschedule your GTF to STL flight. However, if it's been more than 24 hours since booking, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and if any costs are involved. You'll also find more details on our Customer Service portal.

Travel information

Travel information

Origin airport
Great Falls Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Delta, United
Roundtrip price
$312
Distance
1213 mi

Book with confidence

Book with confidence

Great Falls to St. Louis Flights

The cheapest times to fly from Great Falls 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 Great Falls to St. Louis are during the month of December. You can find some of the cheapest flights from Great Falls to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Great Falls to St. Louis

Sunday is one of the best days to book for cheap flights from Great Falls 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 Great Falls 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 Great Falls to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $189 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 Great Falls 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 Great Falls 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.

 

Great Falls to St. Louis Flights

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Explore a world of travel with Expedia

*Available to One Key members.