$137 Cheap Flights from Washington (IAD) to Missoula (MSO)

View $137 flight on Tue, Jun 3, 2025Opens in a new window
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Cheap Flights from Washington to Missoula (IAD-MSO)

Prices were available within the past 7 days and start at $137 for one-way flights and $273 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Mon, Jun 2 - Wed, Jun 4
IAD
Washington
MSO
Missoula
$273 Roundtrip, found 6 hours ago
$273
Roundtrip
found 6 hours ago
Select Alaska Airlines flight, departing Mon, Jun 2 from Washington to Missoula, returning Wed, Jun 4, priced at $273 found 6 hours ago
United
Mon, Jun 9 - Fri, Jun 13
IAD
Washington
MSO
Missoula
$273 Roundtrip, found 10 hours ago
$273
Roundtrip
found 10 hours ago
Select United flight, departing Mon, Jun 9 from Washington to Missoula, returning Fri, Jun 13, priced at $273 found 10 hours ago
Delta
Tue, Jun 10 - Tue, Jun 17
IAD
Washington
MSO
Missoula
$273 Roundtrip, found 4 days ago
$273
Roundtrip
found 4 days ago
Select Delta flight, departing Tue, Jun 10 from Washington to Missoula, returning Tue, Jun 17, priced at $273 found 4 days ago
Delta
Wed, Jun 11 - Wed, Jun 11
IAD
Washington
MSO
Missoula
$278 Roundtrip, found 5 days ago
$278
Roundtrip
found 5 days ago
Select Delta flight, departing Wed, Jun 11 from Washington to Missoula, returning Wed, Jun 11, priced at $278 found 5 days ago
Delta
Tue, Jun 3 - Mon, Jun 9
IAD
Washington
MSO
Missoula
$278 Roundtrip, found 8 hours ago
$278
Roundtrip
found 8 hours ago
Select Delta flight, departing Tue, Jun 3 from Washington to Missoula, returning Mon, Jun 9, priced at $278 found 8 hours ago
American Airlines
Wed, Jun 4 - Wed, Jun 11
IAD
Washington
MSO
Missoula
$281 Roundtrip, found 2 days ago
$281
Roundtrip
found 2 days ago
Select American Airlines flight, departing Wed, Jun 4 from Washington to Missoula, returning Wed, Jun 11, priced at $281 found 2 days ago
Alaska Airlines
Wed, Jun 4 - Mon, Jun 9
IAD
Washington
MSO
Missoula
$282 Roundtrip, found 1 day ago
$282
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Wed, Jun 4 from Washington to Missoula, returning Mon, Jun 9, priced at $282 found 1 day ago
Delta
Mon, Jun 2 - Mon, Jun 9
IAD
Washington
MSO
Missoula
$283 Roundtrip, found 8 hours ago
$283
Roundtrip
found 8 hours ago
Select Delta flight, departing Mon, Jun 2 from Washington to Missoula, returning Mon, Jun 9, priced at $283 found 8 hours ago
American Airlines
Wed, Jun 4 - Wed, Jun 11
IAD
Washington
MSO
Missoula
$285 Roundtrip, found 2 days ago
$285
Roundtrip
found 2 days ago
Select American Airlines flight, departing Wed, Jun 4 from Washington to Missoula, returning Wed, Jun 11, priced at $285 found 2 days ago
Bargain Flight
Thu, Aug 14 - Tue, Aug 19
IAD
Washington
MSO
Missoula
$285 Roundtrip, found 8 hours ago
$285
Roundtrip
found 8 hours ago
Select Bargain Flight flight, departing Thu, Aug 14 from Washington to Missoula, returning Tue, Aug 19, priced at $285 found 8 hours ago
Flights from Washington (IAD) to Missoula (MSO)
Origin airport
Washington Dulles Intl.
Destination airport
Missoula Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Hawaiian Airlines, United
Roundtrip price
$272
Distance
1913 mi

Washington to Missoula Flights

The cheapest times to fly from Washington to Missoula

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

The best time to book a flight from Washington to Missoula

Sunday is one of the best days to book for cheap flights from Washington to Missoula: 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 Washington to Missoula

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 Washington to Missoula in 2025. You can also book with separate airlines for your outbound and return journeys, from $137 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 Washington to Missoula 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 Washington to Missoula 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 Washington Dulles Intl. Airport (IAD) to Missoula Intl. Airport (MSO) cost?
Discover the latest flight deals from IAD to MSO by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from IAD to MSO?
The cheapest flights from IAD to MSO are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from IAD to MSO?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that’ll take you from IAD to MSO. Sort your results by “Price (lowest to highest)” to snap up a great deal.
How many flights per day from Washington Dulles Intl. Airport (IAD) to Missoula Intl. Airport (MSO)?
Direct flights from Washington Dulles Intl. Airport (IAD) to Missoula Intl. Airport (MSO) aren’t available daily, so you’ll have to take a flight with a layover. Explore your options with Expedia’s filters. Enter your dates and choose either “1 Stop” or “2+ Stops.”
What day of the week has the most flights from IAD to MSO?
You’ll usually find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can vary 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 Washington Dulles Intl. Airport (IAD) to Missoula Intl. Airport (MSO)?
To avoid possible delays on the Washington Dulles Intl. Airport (IAD) to Missoula Intl. Airport (MSO) route, aim to travel before 3 PM. Later departures are 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 Washington Dulles Intl. Airport (IAD) to Missoula Intl. Airport (MSO) last-minute?
Last-minute fares from IAD to MSO are typically more expensive. To lock in the cheapest rates, start looking for flights as early as possible. That being said, if you’re flexible with your travel plans, you may find a cheap fare just before your departure.
Is it cheaper to book an IAD to MSO flight and hotel package?
You can save money by securing an IAD to MSO flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it’s easy to manage it all in one place. Once you’ve chosen your preferred flights and accommodations, consider adding extras such as activities, tours and car rentals.
Can I cancel or change the date of my flight from Washington Dulles Intl. Airport (IAD) to Missoula Intl. Airport (MSO)?
If you reserved your IAD to MSO flight within the last 24 hours, you may be able to cancel or modify it without fees. Depending on the airline and the ticket type you purchased, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal if you want more information.

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*Available to One Key members.