HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Washington

$361+ Cheap flights from Decatur, IL (DEC) to Washington

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/3. Fares are subject to change and may not be available on all flights or dates of travel.
DEC — SEA
Jan 14 — Jan 211
Wed 1/14
Wed 1/21
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Decatur to Washington with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Decatur to Washington

Cheapest flights from Decatur to Washington
Explore the most affordable flight options available from Decatur to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 15, 2025.

This United Airlines deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/227:09 pmDEC - SEA
1 stop25h 37mUnited Airlines
Mon 12/297:00 amSEA - DEC
1 stop8h 59mUnited Airlines
Deal found 12/15$589
This United Airlines deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/307:09 pmDEC - SEA
1 stop25h 37mUnited Airlines
Sat 1/311:59 pmSEA - DEC
1 stop7h 06mUnited Airlines
Deal found 12/15$850
This United Airlines deal was found by Cheapflights users on 12/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/287:09 pmDEC - PDX
1 stop25h 52mUnited Airlines
Fri 1/211:55 pmPDX - DEC
1 stop7h 10mUnited Airlines
Deal found 12/13$900
This United Airlines deal was found by Cheapflights users on 12/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/287:09 pmDEC - SEA
2 stops15h 14mUnited Airlines
Thu 1/111:59 pmSEA - DEC
1 stop16h 00mUnited Airlines
Deal found 12/13$948

Find flight deals from Decatur to Washington

Keep the following information in mind while searching for Decatur to Washington flight deals. Data was last updated December 15, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
1 star

Round-trip from

$394
(United Airlines)

One-way from

$361
(United Airlines)
Provider with most accurate pricing for Decatur Arpt-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Decatur Arpt-Seattle/Tacoma Intl flights.
Search Deals
From Decatur Arpt to Washington
Search Deals
One-way flight from Decatur Arpt to Washington
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Decatur to Washington that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 15, 2025.
Use the filters below to find and compare flights from Decatur to Washington that are best for you.

Fly from

Decatur

Fly to

Washington

Route

Depart

Return

Price

DecaturSeattle

DEC - SEA

DECSEA

Decatur Arpt

Wed 4/15

9:42 am-4:25 pm

1 stop8h 43m

Seattle/Tacoma Intl

Sat 4/18

7:00 am-5:51 pm

1 stop8h 51m

$394

DecaturSeattle

DEC - SEA

DECSEA

Decatur Arpt

Wed 4/15

9:42 am-4:25 pm

1 stop8h 43m

Seattle/Tacoma Intl

Sun 4/19

7:00 am-5:51 pm

1 stop8h 51m

$394

DecaturSeattle

DEC - SEA

DECSEA

Decatur Arpt

Sat 2/14

7:15 pm-7:03 pm

1 stop25h 48m

Seattle/Tacoma Intl

Wed 2/18

11:59 pm-8:52 am

1 stop6h 53m

$404

DecaturSeattle

DEC - SEA

DECSEA

Decatur Arpt

Fri 5/29

9:42 am-8:48 pm

2 stops13h 06m

Seattle/Tacoma Intl

Sat 6/6

11:50 pm-8:46 am

1 stop6h 56m

$404

DecaturPortland

DEC - PDX

DECPDX

Decatur Arpt

Fri 2/20

7:15 pm-11:55 am

1 stop18h 40m

Portland

Tue 2/24

7:00 am-5:54 pm

1 stop8h 54m

$424

DecaturPortland

DEC - PDX

DECPDX

Decatur Arpt

Sun 12/28

7:09 pm-7:01 pm

1 stop25h 52m

Portland

Fri 1/2

11:55 pm-9:05 am

1 stop7h 10m

$900

DecaturSeattle

DEC - SEA

DECSEA

Decatur Arpt

Sat 1/3

7:09 pm-10:47 pm

1 stop29h 38m

$361

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/13

Best time to book a flight from Decatur to Washington

Have a flexible travel schedule? Discover the best time to fly to Washington from Decatur with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Decatur to Washington

What is the cheapest month to book a flight from Decatur, Illinois to State of Washington?

Currently, April is the cheapest month in which you can book a flight from Decatur, Illinois to State of Washington (average of $248). Flying from Decatur, Illinois to State of Washington in July is currently the most expensive (average of $360). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Related info for your journey

Find useful and relevant information for your journey from Decatur to Washington. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Decatur to Washington?

    Most people fly from Decatur Arpt (DEC) if they book a flight from Decatur to Washington. Decatur Arpt is conveniently located just 4.7 mi from Decatur’s city center.

  • How long is the flight from Decatur, Illinois to State of Washington?

    Departing from Decatur, Illinois to State of Washington will take you 8h 43m. The distance between Decatur, Illinois and State of Washington is about 1736 mi.

  • Can I find deals for flights from Decatur to Washington that include hotel bookings?

    Yes. In addition to deals on Decatur to Washington flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Decatur to Washington?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Decatur to Washington.

  • Can I find deals for business class flights from Decatur to Washington?

    Yes. Cheapflights offers flight deals from Decatur to Washington by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Decatur, Illinois to State of Washington?

    Currently, April is the cheapest month in which you can book a flight from Decatur, Illinois to State of Washington (average of $248). Flying from Decatur, Illinois to State of Washington in July is currently the most expensive (average of $360). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Decatur to Washington

See prices for flight routes from nearby airports that may be better suited for you.
O'Hare Intl to Las Vegas flights
O'Hare Intl to John F Kennedy Intl flights
O'Hare Intl to Orlando flights
O'Hare Intl to Dallas/Fort Worth flights
O'Hare Intl to Sky Harbor Intl flights
O'Hare Intl to Los Angeles flights
O'Hare Intl to Fort Lauderdale flights
O'Hare Intl to Miami flights
O'Hare Intl to Tampa flights
O'Hare Intl to LaGuardia flights
O'Hare Intl to Denver flights
O'Hare Intl to San Francisco flights
O'Hare Intl to Newark flights
O'Hare Intl to Atlanta flights
Midway to Las Vegas flights
Midway to Orlando flights
O'Hare Intl to Seattle flights
Midway to Los Angeles flights
Midway to Fort Lauderdale flights
Midway to Dallas/Fort Worth flights
O'Hare Intl to Ontario flights
O'Hare Intl to Honolulu flights
O'Hare Intl to Santa Ana flights
O'Hare Intl to Fort Myers flights
O'Hare Intl to San Diego flights
O'Hare Intl to Salt Lake City flights
Midway to Miami flights
O'Hare Intl to Love Field flights
Midway to Atlanta flights
O'Hare Intl to West Palm Beach flights
Midway to John F Kennedy Intl flights
O'Hare Intl to George Bush Intcntl flights
Midway to LaGuardia flights
St. Louis to Las Vegas flights
O'Hare Intl to Reagan-National flights
O'Hare Intl to Sarasota flights
Midway to Tampa flights
O'Hare Intl to New Orleans flights
O'Hare Intl to Austin flights
O'Hare Intl to Key West flights
O'Hare Intl to Baltimore flights
O'Hare Intl to Palm Springs flights
O'Hare Intl to Nashville flights
Midway to Sky Harbor Intl flights
O'Hare Intl to Charleston flights
O'Hare Intl to Burbank flights
O'Hare Intl to Philadelphia flights
O'Hare Intl to Kahului flights
O'Hare Intl to Hobby flights
Midway to Denver flights

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.