Cheap Flights from Decatur (DEC) to Washington (IAD)

Popular airlines from Decatur, IL (DEC) to Washington Dulles Intl. Airport (IAD)

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Cheap Flights from Decatur to Washington (DEC-IAD)

Prices were available within the past 7 days and start at for one-way flights and $314 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sun, Nov 23 - Wed, Dec 3
DEC
Decatur
IAD
Washington
$314 Roundtrip, found 3 days ago
$314
Roundtrip
found 3 days ago
Select United flight, departing Sun, Nov 23 from Decatur to Washington, returning Wed, Dec 3, priced at $314 found 3 days ago
United
Thu, Sep 25 - Fri, Oct 3
DEC
Decatur
IAD
Washington
$319 Roundtrip, found 3 days ago
$319
Roundtrip
found 3 days ago
Select United flight, departing Thu, Sep 25 from Decatur to Washington, returning Fri, Oct 3, priced at $319 found 3 days ago
United
Thu, Sep 25 - Wed, Oct 1
DEC
Decatur
IAD
Washington
$324 Roundtrip, found 3 days ago
$324
Roundtrip
found 3 days ago
Select United flight, departing Thu, Sep 25 from Decatur to Washington, returning Wed, Oct 1, priced at $324 found 3 days ago
United
Thu, Sep 25 - Tue, Sep 30
DEC
Decatur
IAD
Washington
$329 Roundtrip, found 3 days ago
$329
Roundtrip
found 3 days ago
Select United flight, departing Thu, Sep 25 from Decatur to Washington, returning Tue, Sep 30, priced at $329 found 3 days ago
United
Sun, Nov 23 - Thu, Dec 4
DEC
Decatur
IAD
Washington
$340 Roundtrip, found 3 days ago
$340
Roundtrip
found 3 days ago
Select United flight, departing Sun, Nov 23 from Decatur to Washington, returning Thu, Dec 4, priced at $340 found 3 days ago
United
Tue, Sep 23 - Fri, Oct 3
DEC
Decatur
IAD
Washington
$344 Roundtrip, found 3 days ago
$344
Roundtrip
found 3 days ago
Select United flight, departing Tue, Sep 23 from Decatur to Washington, returning Fri, Oct 3, priced at $344 found 3 days ago
United
Thu, Sep 25 - Sun, Oct 5
DEC
Decatur
IAD
Washington
$345 Roundtrip, found 3 days ago
$345
Roundtrip
found 3 days ago
Select United flight, departing Thu, Sep 25 from Decatur to Washington, returning Sun, Oct 5, priced at $345 found 3 days ago
United
Tue, Sep 23 - Wed, Oct 1
DEC
Decatur
IAD
Washington
$349 Roundtrip, found 3 days ago
$349
Roundtrip
found 3 days ago
Select United flight, departing Tue, Sep 23 from Decatur to Washington, returning Wed, Oct 1, priced at $349 found 3 days ago
United
Tue, Sep 23 - Tue, Sep 30
DEC
Decatur
IAD
Washington
$354 Roundtrip, found 3 days ago
$354
Roundtrip
found 3 days ago
Select United flight, departing Tue, Sep 23 from Decatur to Washington, returning Tue, Sep 30, priced at $354 found 3 days ago
United
Thu, Nov 27 - Wed, Dec 3
DEC
Decatur
IAD
Washington
$356 Roundtrip, found 3 days ago
$356
Roundtrip
found 3 days ago
Select United flight, departing Thu, Nov 27 from Decatur to Washington, returning Wed, Dec 3, priced at $356 found 3 days ago
United
Fri, Nov 28 - Wed, Dec 3
DEC
Decatur
IAD
Washington
$359 Roundtrip, found 3 days ago
$359
Roundtrip
found 3 days ago
Select United flight, departing Fri, Nov 28 from Decatur to Washington, returning Wed, Dec 3, priced at $359 found 3 days ago
United
Mon, Sep 29 - Fri, Oct 3
DEC
Decatur
IAD
Washington
$361 Roundtrip, found 3 days ago
$361
Roundtrip
found 3 days ago
Select United flight, departing Mon, Sep 29 from Decatur to Washington, returning Fri, Oct 3, priced at $361 found 3 days ago
United
Thu, Nov 27 - Tue, Dec 2
DEC
Decatur
IAD
Washington
$366 Roundtrip, found 3 days ago
$366
Roundtrip
found 3 days ago
Select United flight, departing Thu, Nov 27 from Decatur to Washington, returning Tue, Dec 2, priced at $366 found 3 days ago
United
Fri, Nov 28 - Tue, Dec 2
DEC
Decatur
IAD
Washington
$369 Roundtrip, found 3 days ago
$369
Roundtrip
found 3 days ago
Select United flight, departing Fri, Nov 28 from Decatur to Washington, returning Tue, Dec 2, priced at $369 found 3 days ago
United
Tue, Sep 23 - Sun, Oct 5
DEC
Decatur
IAD
Washington
$370 Roundtrip, found 3 days ago
$370
Roundtrip
found 3 days ago
Select United flight, departing Tue, Sep 23 from Decatur to Washington, returning Sun, Oct 5, priced at $370 found 3 days ago
United
Thu, Nov 27 - Thu, Dec 4
DEC
Decatur
IAD
Washington
$382 Roundtrip, found 3 days ago
$382
Roundtrip
found 3 days ago
Select United flight, departing Thu, Nov 27 from Decatur to Washington, returning Thu, Dec 4, priced at $382 found 3 days ago
United
Fri, Nov 28 - Thu, Dec 4
DEC
Decatur
IAD
Washington
$385 Roundtrip, found 3 days ago
$385
Roundtrip
found 3 days ago
Select United flight, departing Fri, Nov 28 from Decatur to Washington, returning Thu, Dec 4, priced at $385 found 3 days ago
United
Sun, Nov 23 - Fri, Nov 28
DEC
Decatur
IAD
Washington
$390 Roundtrip, found 3 days ago
$390
Roundtrip
found 3 days ago
Select United flight, departing Sun, Nov 23 from Decatur to Washington, returning Fri, Nov 28, priced at $390 found 3 days ago
United
Mon, Oct 6 - Wed, Oct 15
DEC
Decatur
IAD
Washington
$394 Roundtrip, found 1 day ago
$394
Roundtrip
found 1 day ago
Select United flight, departing Mon, Oct 6 from Decatur to Washington, returning Wed, Oct 15, priced at $394 found 1 day ago
United
Mon, Oct 6 - Thu, Oct 16
DEC
Decatur
IAD
Washington
$401 Roundtrip, found 1 day ago
$401
Roundtrip
found 1 day ago
Select United flight, departing Mon, Oct 6 from Decatur to Washington, returning Thu, Oct 16, priced at $401 found 1 day ago

Alternative airports near Washington

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Ronald Reagan Washington National DCA. Closest option available. Average driving time to city center is 8 minutes. Flights from $440
DCA
Ronald Reagan Washington National
Closest
Average driving time to city center8 min
Flights from $440
Flights from Decatur (DEC) to Washington (IAD)
Origin airport
Decatur
Destination airport
Washington Dulles Intl.
Airlines serving
United
Roundtrip price
$314
Distance
612 mi

Decatur to Washington Flights

The cheapest times to fly from Decatur to Washington

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

 

The best time to book a flight from Decatur to Washington

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

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 Decatur to Washington 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 Decatur to Washington 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 Decatur to Washington 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 Decatur Airport (DEC) to Washington Dulles Intl. Airport (IAD) cost?
Lock in a cheap one-way flight or cheap return flight from $314 from Decatur Airport (DEC) to Washington Dulles Intl. Airport (IAD) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Decatur Airport (DEC) to Washington Dulles Intl. Airport (IAD)?
Planning your trip for November is a good way to save, as it's the cheapest month for flights between DEC and IAD. You'll usually find the lowest fares during the off-season.
What is the cheapest airline that flies from Decatur Airport (DEC) to Washington Dulles Intl. Airport (IAD)?
To find the cheapest airline that'll fly you from DEC to IAD, use Expedia's filter tool. Customize your search based on your travel style, such as preferred carriers and cabin class. You can then sort your results by "Price (lowest to highest)" to list the most affordable options first.
How many flights per day from Decatur Airport (DEC) to Washington Dulles Intl. Airport (IAD)?
You'll need to book a flight with a layover when traveling from Decatur Airport (DEC) to Washington Dulles Intl. Airport (IAD). Direct flights don't operate daily on this route. However, just filter your search to include one or more stops to discover an option that works for you.
What day of the week has the most flights from DEC to IAD?
Friday is typically the busiest day for flights, while Tuesday tends to be the quietest.* Remember that flight schedules can change based on various factors, including the time of year 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 Decatur Airport (DEC) to Washington Dulles Intl. Airport (IAD)?
Select a flight from Decatur Airport (DEC) to Washington Dulles Intl. Airport (IAD) that leaves before 3 PM to reduce the risk of cancellations. Later departures have a 22% higher chance of being canceled, on average.**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 Decatur Airport (DEC) to Washington Dulles Intl. Airport (IAD) last-minute?
Last-minute bookings from DEC to IAD are typically more expensive. To lock in the best prices, start looking for flights as early as possible. That said, if you can play around with your travel dates, it's possible to find a cheap fare right before your trip.
Is it cheaper to book a DEC to IAD flight and hotel package?
You'll typically save money by securing a DEC to IAD 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. Once you've selected your ideal flights and accommodations, consider adding extras including car rentals, tours and activities.
Can I cancel or change the date of my flight from Decatur Airport (DEC) to Washington Dulles Intl. Airport (IAD)?
If you booked your DEC to IAD flight within the last 24 hours, you may be able to cancel or modify it without any fees. 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, head to our Customer Service portal if you want more information.

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*Available to One Key members.