$153 Cheap Flights to St. Mary, MT

Flights to St. Mary at a glance

Traveling to St. Mary is easy—choose between full-service and budget airlines, compare travel times, and select the best option that aligns with your budget and schedule. Whether you’re looking for cheap flights to St. Mary or the cheapest flight to St. Mary, planning your trip to explore the city’s highlights is simple.

• Major airport near St. Mary: Glacier Park International Airport (FCA)
• Flights per week: 1,100+ flights arriving at St. Mary airport
• Number of airlines that fly to St. Mary: around 5+ carriers

Popular airport near St. Mary

St. Mary is a charming village perfect for outdoor enthusiasts seeking adventure and stunning scenery. Visitors flock here for eco-friendly activities, wellness retreats, and relaxation. This picturesque destination is conveniently accessible via a major airport, making it easy to find affordable flights to St. Mary.

• Glacier Park International Airport (FCA): Situated in Flathead County, Montana, approximately 48 miles from St. Mary, this airport facilitates both domestic and international air travel. With connections to over 130 domestic locations and 7 international spots, travelers can opt for upgraded service in business class, first class, or premium economy, tailored to their selected routes and airlines. Major carriers operating here include United, Delta, and American Airlines, ensuring a variety of flight options.

Top routes to St. Mary

• Chicago (ORD) to St. Mary (FCA), with one-way airfare from around $120
• Los Angeles (LAX) to St. Mary (FCA), with one-way tickets available from around $120
• Dallas (DFW) to St. Mary (FCA), with one-way flight options from around $110
• Phoenix (PHX) to St. Mary (FCA), with one-way airfare from around $120
• Houston (IAH/HOU) to St. Mary (FCA), with one-way airfare from around $130

Cheapest routes to St. Mary

• Seattle (SEA) to St. Mary (FCA), with cheap one-way fares from around $80
• Portland (PWM/PDX) to St. Mary (FCA), with low one-way fares from around $90
• Redding (RDD) to St. Mary (FCA), with low one-way fares from around $90
• Santa Rosa (STS) to St. Mary (FCA), with budget one-way fares from around $90
• Minneapolis (MSP) to St. Mary (FCA), with budget one-way fares from around $95

*Flight times and fares vary by season and availability and are based on one-way routes

Top airlines with flights to St. Mary

• United: Operating flights to Glacier Park International Airport (FCA), United represents about 41% of arrivals in St. Mary. The typical one-way fare hovers around $300, with premium cabin choices potentially including first class, depending on the specific route.
• Delta: With services to Glacier Park International Airport (FCA), Delta accounts for roughly 26% of arrivals to St. Mary. Passengers can expect an average one-way fare of about $280, with premium cabin options that may feature premium economy and first class based on the route.
• Alaska Airlines: Providing flights to Glacier Park International Airport (FCA), Alaska Airlines makes up approximately 17% of arrivals to St. Mary. The average one-way fare is around $270, and premium cabin options may include both business class and first class, depending on the route.
• American Airlines: Serving Glacier Park International Airport (FCA), American Airlines comprises about 15% of arrivals to St. Mary. Travelers can expect an average one-way fare of around $280, with premium cabin options possibly including first class, depending on the route.
• Sun Country Airlines: Offering flights to Glacier Park International Airport (FCA), Sun Country Airlines features an average one-way fare of approximately $170, providing travelers with affordable options for reaching St. Mary.

Best time to fly to St. Mary

The most popular months for travelers to fly to St. Mary are June, July, and August, when peak temperatures in St. Mary can reach up to 63.5°F in July. If you prefer quieter travel, consider November, the least busy and relatively cheaper time to visit with fewer crowds and temperatures around 26.2°F. For better deals, October usually offers the lowest average one-way fare around $236, roughly 17% cheaper than the yearly average. Looking for additional cheaper months to fly? November offers an average one-way fare of around $257, making it a good option for flexible travelers.

*Average one-way fare is based on Expedia flight booking data from January 2025 to April 2026 for the specified route and travel class and may change depending on availability, dates, and demand.

How to save money on a flight to St. Mary

Getting some of the best deals on flights to St. Mary is all about timing and flexibility. Here are some key tips to help you save:

1. Compare flight options—use Expedia's search tool to compare airlines, routes, direct vs. non-direct flights, and flight times. You can also sort by price to find the most affordable options.
2. Set up price alerts—as an Expedia member you can use Price Tracking to receive notifications when flight prices change.
3. Bundle and save—book a flight and unlock a hotel deal on Expedia*, or explore our St. Mary hotel and flight deals.
4. Think about luggage-nowadays, it's important to check the airline's baggage policies to find the best value. That may be paying for an additional carry-on bag or booking a ticket with checked luggage included. Either way, double-check your baggage allowance before confirming your booking to avoid excess baggage fees at the airport.
5. Earn miles—you can earn airline miles when you book your St. Mary flight with Expedia. Just select your frequent flyer program and enter your program number when confirming your booking.

*For members. Select hotels.

Arriving in St. Mary

St. Mary welcomes travelers through its range of transport options based on price, convenience, and proximity. Here's how to reach St. Mary efficiently:

• Public transportation: From Glacier Park International Airport, Whitefish Seaport, a seaport, is about 8.1 miles away, while Whitefish Depot, a train station, is located approximately 8.3 miles from the airport, providing convenient access to both locations.
• Hotel transfer: Transfers offer a convenient way to reach your hotel in St. Mary, with private rides that can be arranged in advance.
• Car rental: Renting a car in St. Mary is a good option if you plan to explore and sightsee beyond the city. Browse cheap car rentals in St. Mary on Expedia.
• Taxi/ride-hailing: Taxis and ride-hailing services may be available from designated pickup areas outside the terminal, check locally on arrival.

Where to stay in and around St. Mary

• East Glacier Park: East Glacier Park is located 7 miles drive away from St. Mary and serves as a gateway to outdoor adventures and stunning scenery. This charming city invites travelers to explore its recreational areas and hiking trails, making it a perfect spot for nature lovers. Key attractions include the romantic St. Mary Lake, the scenic Glacier Park Lodge Golf Course, and the breathtaking St. Mary Falls, all of which promise memorable experiences in the great outdoors.
• Browning: St. Mary is situated in Browning, a city known for its rich cultural heritage and beautiful landscapes. Ideal for adventure seekers, Browning offers an array of recreational activities and easy access to hiking trails. Visitors can immerse themselves in local culture at the Lodgepole Gallery and Tipi Village, enjoy golf at the Glacier Park Lodge Golf Course, or relax by the picturesque Two Medicine Lake, where romantic views abound.
• Babb: Babb is located 8 miles drive away from St. Mary and is a haven for outdoor enthusiasts and scenery lovers. This quaint city boasts numerous recreational areas and hiking opportunities. Travelers can explore the enchanting St. Mary Lake, embark on an adventure up Chief Mountain, or experience the serene beauty of Iceberg Lake, making Babb a must-visit destination for those seeking tranquility and adventure in nature.

Tips for short-haul flights to St. Mary

For quick getaways, efficiency is key. Here is how to make your short-haul journey smoother:

• Pack light and skip checked bags—when flying with budget airlines, traveling with just a carry-on is often more economical. Maximize space by using mini toiletries, wearing your bulkiest clothing, and coordinating outfits thoughtfully. This strategy also helps you avoid the wait at baggage claim once you land.
• Bring your own entertainment—many short-haul flights may lack in-flight entertainment options. Make sure to download TV shows, movies, music, or podcasts in advance, and consider bringing a book to keep yourself occupied. Remember to fully charge your devices before you board.
• Arrive at the airport in plenty of time—even for short or domestic flights, it’s advisable to arrive at least 1.5 to 2 hours before your departure, taking into account traffic and security lines.
• Bring your own snacks and water—pack snacks and a refillable water bottle to stay hydrated and save money at the airport.

Tips for long-haul flights to St. Mary

Flying long-haul sometimes requires extra planning to ensure a comfortable journey:

• Select your seat in advance—for longer flights, choosing your seat is essential for comfort. Full-service airlines typically allow free seat selection once online check-in opens, usually 24–48 hours before your flight. Some airlines may permit seat selection even earlier.
• Arrive at the airport in plenty of time—plan to be at the airport a minimum of 3 hours before departure for international flights to ensure you have enough time for check-in, security, and immigration.
• Relax at the airport—if you find yourself with extra time, take the opportunity to browse the shops, grab a coffee, or unwind at the gate or in a departure lounge if you have access. Airport Wi-Fi is generally free and available.
• Adjust to the new time zone mid-flight—begin syncing your body clock by changing your watch and adjusting your sleep schedule to align with your destination's time zone. Aim to sleep or stay awake during the flight based on the local time of your arrival to help minimize jet lag.

Tips to find the cheapest flights to St. Mary

The cheapest day to fly

Get started finding a cheap flight to St. Mary on Expedia by either choosing a deal on this page or entering into the search bar your travel dates, origin airport, and whether you want roundtrip or one-way airfare. You can filter for flexibility, number of stops, airline, and departure/arrival times to find the best flight for you.

The cheapest month to fly

October is the cheapest month to fly to St. Mary. This coincides with the low season when fewer people travel. Whichever month you travel in, though, be sure to book at least a month in advance if you want to score cheap tickets to St. Mary. ARC's data shows that domestic flights booked 28 days or more before departure are typically 24% cheaper than those booked last minute.

The most affordable time to book a flight

Typically, a Sunday can be the cheapest time to book a flight to St. Mary, according to ARC’s data. On average, you could save between 6% and 13% by booking on a Sunday instead of a Friday, which is the most expensive day to make a reservation.

The cheapest round-trip tickets to St. Mary

The lowest price for round-trip flights to St. Mary in 2026 starts from $262, while one-way tickets start from from $153. Expedia's effective search tool is one of the best ways to find a budget airfare. Simply enter your dates, and within seconds, it'll show you a vast selection of the cheapest flights to St. Mary. If you have a preferred departure time or airline, you can use the handy filters to customize your search.

The cheapest airlines flying to St. Mary

United, Delta, American Airlines, Alaska Airlines are just some of the airlines that can typically offer cheap tickets to St. Mary. You can find their most affordable flights by using the “airline” search filter and then sorting prices from low to high. As a trusted partner of the world's leading airlines, Expedia offers you some of the best airfare deals to St. Mary and countless more destinations worldwide.

The most affordable airports to fly into

To view the cheapest airports to fly into for St. Mary, simply order your search results from lowest to highest price. Expedia's search tool compares flight prices for all airports close to your destination, so you don't have to manually search them one by one to find the cheapest flight to St. Mary. If you have a preferred place to fly into, take advantage of the “arrival airport” filter to narrow down your search on Expedia.

Save with a package

With Expedia's amazing package deals, you could save hundreds of dollars by booking your St. Mary plane tickets together with your accommodations, car rental, or activities. Just select the search wizard's “package” option to view some of the cheapest deals. Look out for the green savings label to see how much you're saving.

Date flexibility for the cheapest flights to St. Mary

If you can be flexible with your travel dates, it's a good idea to broaden your search by comparing prices on different days. This will open up more options, meaning you could uncover a less expensive flight to St. Mary.

Stopover savings

The cheapest tickets to St. Mary are sometimes those with a stopover. Book one of these flights, and you'll change planes at an airport en route to St. Mary. While the overall travel time might be longer than a non-stop flight, you may decide it's worth it for the money saved.

Get Expedia's Price Drop Protection

Price Drop Protection means that if your flight gets cheaper after booking, you'll be credited the difference*. This gives you peace of mind that you're getting one of the cheapest flights to St. Mary for your chosen departure. Expedia's Price Drop Protection is available for a small fee but is free to One Key Gold and Platinum tier members.

*Terms apply.

Use our Price Tracking feature

Expedia's Price Tracking feature is another great tool that removes the guesswork from finding cheap flights to St. Mary. Simply download the free Expedia app to your smart device and activate St. Mary flight price alerts for your travel dates. There's even a price predictor tool that uses historical data to indicate the best time to book, giving you peace of mind that you'll nab the lowest prices.

Book with Expedia

As well as Price Drop Protection and Price Tracking, Expedia's close partnership with a vast selection of the world's leading airlines means you're sure to find cheap flights to St. Mary. Plus, the One Key rewards program lets you earn real cash rewards on most bookings that you can use to save money on future trips. Best of all, it's free to join, and members often unlock exclusive discounts, too.

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