What are the cheapest airlines flying from Great Falls to St. Louis round-trip?

Our cheapest airline available from Great Falls to St. Louis is United Airlines. Our recent data shows that you can find tickets from as low as $373 on this airline. An additional option worth looking into is Delta, starting at $376. These flights start at 30% lower than the current average price 3 months from now.

What is the cheapest month to book a flight from Great Falls to St. Louis?

Currently, August is the cheapest month in which you can book a flight from Great Falls to St. Louis (average of $311). Flying from Great Falls to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest day to fly from Great Falls to St. Louis?

Travelers seeking maximum savings on their Great Falls to St. Louis flight should consider departing on Friday afternoons when fares are most often at their lowest. Thursday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

If weather is an important factor for your trip to St. Louis, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

What is the cheapest day to fly round-trip from Great Falls to St. Louis?

Tuesday is generally a great day to depart. Flying on this day could help you save up to 49%.

What is the cheapest month to fly from Great Falls to St. Louis?

Our data shows that March tends to be the cheapest month to fly to St. Louis from Great Falls. Users have commonly found prices around $536 for the month, but tickets can be as low as $165. Due to multiple factors, prepare for potentially higher prices in July.

What is the cheapest time of day to fly from GTF to STL?

One of the essential ways to save on airfare from Great Falls to St. Louis is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the afternoon could potentially save you up to 10% on airfare.

Can I find deals for flights from Great Falls to St. Louis that include hotel bookings?

Yes. In addition to deals on Great Falls to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Great Falls to St. Louis?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Great Falls to St. Louis.

Can I find deals for business class flights from Great Falls to St. Louis?

Yes. Cheapflights offers flight deals from Great Falls to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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Cheap flight deals from Great Falls to St. Louis

Popular in	July
Cheapest in	March
Average price	$538

Highest demand for flights based on searches. 19% potential increase in price ($133 potential increase over avg. RT price).

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Cheapest flight prices on average. 4% potential price decrease ($25 potential savings vs. average RT price).

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Average for round-trip flights in September 2025

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Best time to book a flight from Great Falls to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Great Falls with our price prediction graph.

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.

Reviews of airlines servicing St. Louis

Get a feel of what it's like to fly with Delta and United Airlines from Great Falls to St. Louis by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

7,954 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Delta

8.0

Very good

7,954 reviews

Delta

8.0

Very good

7,954 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

United Airlines

7.4

Good

8,929 reviews

Delta

8.0

Very good

7,954 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

What are the cheapest airlines flying from Great Falls to St. Louis round-trip?
Our cheapest airline available from Great Falls to St. Louis is United Airlines. Our recent data shows that you can find tickets from as low as $373 on this airline. An additional option worth looking into is Delta, starting at $376. These flights start at 30% lower than the current average price 3 months from now.
Can I find deals for flights from Great Falls to St. Louis that include hotel bookings?
Yes. In addition to deals on Great Falls to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Great Falls to St. Louis?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Great Falls to St. Louis.
Can I find deals for business class flights from Great Falls to St. Louis?
Yes. Cheapflights offers flight deals from Great Falls to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Great Falls to St. Louis?
Currently, August is the cheapest month in which you can book a flight from Great Falls to St. Louis (average of $311). Flying from Great Falls to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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Top 2 airlines flying from Great Falls to St. Louis

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$373	Average$488	FlexibilityNo cancel fee	On-time69%
Delta	Cheapest$376	Average$538	FlexibilityNo cancel fee	On-timeN/A

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Find cheap flights from Great Falls to St. Louis with Cheapflights

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3. Compare prices and book

Cheap flight deals from Great Falls to St. Louis

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Best time to book a flight from Great Falls to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Great Falls with our price prediction graph.

Reviews of airlines servicing St. Louis

Get a feel of what it's like to fly with Delta and United Airlines from Great Falls to St. Louis by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Great Falls to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What are the cheapest airlines flying from Great Falls to St. Louis round-trip?

Can I find deals for flights from Great Falls to St. Louis that include hotel bookings?

How can I find direct flights from Great Falls to St. Louis?

Can I find deals for business class flights from Great Falls to St. Louis?

What is the cheapest month to book a flight from Great Falls to St. Louis?

Traveling to a place near St. Louis?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Great Falls to St. Louis

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Complete your trip

Complete your trip to St. Louis by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from Great Falls to St. Louis by cabin class

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Great Falls and St. Louis flights

Browse other Great Falls and St. Louis flight options. Last updated on September 15, 2025.

Other flights from Great Falls

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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 15, 2025.

Top 2 airlines flying from Great Falls to St. Louis

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

Find cheap flights from Great Falls to St. Louis with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Great Falls to St. Louis

Popular in

Cheapest in

Average price

Best time to book a flight from Great Falls to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Great Falls with our price prediction graph.

Reviews of airlines servicing St. Louis

Get a feel of what it's like to fly with Delta and United Airlines from Great Falls to St. Louis by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Great Falls to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What are the cheapest airlines flying from Great Falls to St. Louis round-trip?

Can I find deals for flights from Great Falls to St. Louis that include hotel bookings?

How can I find direct flights from Great Falls to St. Louis?

Can I find deals for business class flights from Great Falls to St. Louis?

What is the cheapest month to book a flight from Great Falls to St. Louis?

Traveling to a place near St. Louis?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Great Falls to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.

Top 2 airlines flying from Great Falls to St. Louis

100% Free

Book with Flexibility

Travel Smart