$198 Cheap Flights from Washington (IAD) to Marion (MWA)

View $198 flight on Sat, Dec 6, 2025Opens in a new window

Popular airlines from Washington Dulles Intl. Airport (IAD) to Marion, IL (MWA-Williamson County Regional)

Cheap Flights from Washington to Marion (IAD-MWA)

Prices were available within the past 7 days and start at $198 for one-way flights and $421 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sun, Dec 14 - Mon, Dec 15
IAD
Washington
MWA
Marion
$421 Roundtrip, found 1 day ago
$421
Roundtrip
found 1 day ago
Select United flight, departing Sun, Dec 14 from Washington to Marion, returning Mon, Dec 15, priced at $421 found 1 day ago
United
Thu, Nov 27 - Fri, Dec 12
IAD
Washington
MWA
Marion
$455 Roundtrip, found 1 day ago
$455
Roundtrip
found 1 day ago
Select United flight, departing Thu, Nov 27 from Washington to Marion, returning Fri, Dec 12, priced at $455 found 1 day ago
United
Wed, Nov 19 - Fri, Dec 5
IAD
Washington
MWA
Marion
$464 Roundtrip, found 1 day ago
$464
Roundtrip
found 1 day ago
Select United flight, departing Wed, Nov 19 from Washington to Marion, returning Fri, Dec 5, priced at $464 found 1 day ago
United
Sun, Dec 7 - Fri, Dec 12
IAD
Washington
MWA
Marion
$489 Roundtrip, found 2 days ago
$489
Roundtrip
found 2 days ago
Select United flight, departing Sun, Dec 7 from Washington to Marion, returning Fri, Dec 12, priced at $489 found 2 days ago
United
Fri, Dec 5 - Fri, Dec 12
IAD
Washington
MWA
Marion
$499 Roundtrip, found 2 days ago
$499
Roundtrip
found 2 days ago
Select United flight, departing Fri, Dec 5 from Washington to Marion, returning Fri, Dec 12, priced at $499 found 2 days ago
United
Wed, Nov 19 - Sat, Nov 29
IAD
Washington
MWA
Marion
$500 Roundtrip, found 1 day ago
$500
Roundtrip
found 1 day ago
Select United flight, departing Wed, Nov 19 from Washington to Marion, returning Sat, Nov 29, priced at $500 found 1 day ago
United
Sun, Dec 14 - Mon, Dec 15
IAD
Washington
MWA
Marion
$504 Roundtrip, found 1 day ago
$504
Roundtrip
found 1 day ago
Select United flight, departing Sun, Dec 14 from Washington to Marion, returning Mon, Dec 15, priced at $504 found 1 day ago
United
Tue, Nov 18 - Fri, Dec 5
IAD
Washington
MWA
Marion
$514 Roundtrip, found 1 day ago
$514
Roundtrip
found 1 day ago
Select United flight, departing Tue, Nov 18 from Washington to Marion, returning Fri, Dec 5, priced at $514 found 1 day ago
United
Fri, Nov 14 - Mon, Nov 17
IAD
Washington
MWA
Marion
$515 Roundtrip, found 1 day ago
$515
Roundtrip
found 1 day ago
Select United flight, departing Fri, Nov 14 from Washington to Marion, returning Mon, Nov 17, priced at $515 found 1 day ago
United
Thu, Nov 20 - Fri, Dec 5
IAD
Washington
MWA
Marion
$520 Roundtrip, found 1 day ago
$520
Roundtrip
found 1 day ago
Select United flight, departing Thu, Nov 20 from Washington to Marion, returning Fri, Dec 5, priced at $520 found 1 day ago

Frequently asked questions

How much does a flight from Washington Dulles Intl. Airport (IAD) to Williamson County Regional Airport (MWA) cost?
Secure a cheap one-way flight from $198 or cheap return flight from $421 from Washington Dulles Intl. Airport (IAD) to Williamson County Regional Airport (MWA) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Washington Dulles Intl. Airport (IAD) to Williamson County Regional Airport (MWA)?
Flying in December can help you save, as it's the cheapest month for flights between IAD and MWA. You'll typically find the lowest fares during off-peak months.
What is the cheapest airline that flies from Washington Dulles Intl. Airport (IAD) to Williamson County Regional Airport (MWA)?
Expedia's filter tool lets you easily compare airlines, flight times and baggage options all in one place. Customize the search to your preferences, then sort by "Price (lowest to highest)" to find the carrier with the cheapest IAD to MWA flight.
How many flights per day from Washington Dulles Intl. Airport (IAD) to Williamson County Regional Airport (MWA)?
You'll have to catch a flight with a layover when traveling from Washington Dulles Intl. Airport (IAD) to Williamson County Regional Airport (MWA). There are no daily direct flights on this route. However, just filter your search to include one or more stops to find an option that works for you.
What day of the week has the most flights from IAD to MWA?
Typically you'll find the largest variety of flight choices on a Friday. Tuesdays are often the quietest.* But this can vary depending on the airline, season 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 Washington Dulles Intl. Airport (IAD) to Williamson County Regional Airport (MWA)?
Select a flight from Washington Dulles Intl. Airport (IAD) to Williamson County Regional Airport (MWA) that takes off before 3 PM to reduce the risk of delays and cancellations. Departures after this hour are on average 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 Williamson County Regional Airport (MWA) last-minute?
Booking your plane ticket from IAD to MWA shortly before your trip is usually more expensive. But if you're flexible with your travel times and dates, you could bag a cheap last-minute fare.
Is it cheaper to book an IAD to MWA flight and hotel package?
Compared with arranging hotels and flights separately, booking an IAD to MWA flight and hotel package with Expedia could lead to significant savings. Better yet, having everything in one place takes the hassle out of travel planning. Just secure your flights and select from our extensive range of hotels, then customize your trip with other add-ons like tours and car rentals.
Can I cancel or change the date of my flight from Washington Dulles Intl. Airport (IAD) to Williamson County Regional Airport (MWA)?
If you reserved your IAD to MWA flight within the last 24 hours, you may be able to modify or cancel it at no cost. Depending on the airline and the type of ticket you purchased, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal for more details.

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
Williamson County Regional
Roundtrip price
$421
Distance
631 mi

Book with confidence

Washington to Marion Flights

The cheapest times to fly from Washington to Marion

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

 

The best time to book a flight from Washington to Marion

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

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 Marion in 2025. You can also book with separate airlines for your outbound and return journeys, from $198 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 Marion 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 Marion 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.

 

Washington to Marion Flights

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*Available to One Key members.