Cheap Flights from St. Louis (STL) to Unalaska (DUT)

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Unalaska, AK (DUT)

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Unalaska Airport (DUT) cost?
Get a cheap one-way flight or cheap return flight from Lambert-St. Louis Intl. Airport (STL) to Unalaska Airport (DUT) 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 Lambert-St. Louis Intl. Airport (STL) to Unalaska Airport (DUT)?
Planning your getaway for can help you save, as it's the cheapest month for flights between STL and DUT. You'll usually find the lowest fares during off-peak months.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Unalaska Airport (DUT)?
To find the cheapest airline flying from STL to DUT, use Expedia's filter tool. Tailor your search based on your travel needs, 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 Lambert-St. Louis Intl. Airport (STL) to Unalaska Airport (DUT)?
You'll have to catch a flight with a layover if you're traveling from Lambert-St. Louis Intl. Airport (STL) to Unalaska Airport (DUT). There are no daily direct flights on this route. However, simply filter your search to include one or more stops to discover the best option for your trip.
What day of the week has the most flights from STL to DUT?
Friday is usually the busiest day for flights, while Tuesday is often the quietest.* Remember that flight schedules can change depending on a range of factors, such as the season and airline.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Unalaska Airport (DUT)?
To reach Unalaska Airport (DUT) without delays, opt for a flight that takes off from Lambert-St. Louis Intl. Airport (STL) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**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 Lambert-St. Louis Intl. Airport (STL) to Unalaska Airport (DUT) last-minute?
Holding off until just before your departure to book a flight from STL to DUT generally means paying more. Although you may find some last-minute offers, there's no guarantee. Keep your travel schedule open for a better chance of scoring a bargain.
Is it cheaper to book a STL to DUT flight and hotel package?
You'll generally save money by securing a STL to DUT flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's easy to manage it all in one convenient place. After selecting your preferred accommodations and flights, consider adding extras including activities, tours and car rentals.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Unalaska Airport (DUT)?
If you reserved your STL to DUT flight within the last 24 hours, you may be able to modify or cancel it at no cost. Depending on the airline and the ticket type you purchased, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal if you'd like more information.

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Unalaska
Distance
3593 mi

Book with confidence

St. Louis to Unalaska Flights

The cheapest times to fly from St. Louis to Unalaska

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 St. Louis to Unalaska are during the month of . You can find some of the cheapest flights from St. Louis to Unalaska with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from St. Louis to Unalaska: 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 St. Louis to Unalaska

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 St. Louis to Unalaska in 2025. You can also book with separate airlines for your outbound and return journeys, from 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 St. Louis to Unalaska 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 St. Louis to Unalaska 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.

 

St. Louis to Unalaska Flights

Explore a world of travel with Expedia

*Available to One Key members.