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$304+ Cheap flights from Decatur, IL (DEC) to Washington

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/5. Fares are subject to change and may not be available on all flights or dates of travel.
DEC — SEA
Mar 3 — Mar 101
Tue 3/3
Tue 3/10
1 adult, Economy
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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 February 1, 2026.

This United Airlines deal was found by Cheapflights users on 1/31. 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.
Fri 6/56:55 pm
DEC
-
SEA
1 stop7h 04m
United Airlines
Sat 6/1310:40 pm
SEA
-
DEC
1 stop8h 06m
United Airlines
Deal found 1/31$304
This United Airlines deal was found by Cheapflights users on 1/30. 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 10/276:55 pm
DEC
-
PDX
1 stop6h 57m
United Airlines
Sat 10/3111:55 pm
PDX
-
DEC
1 stop7h 51m
United Airlines
Deal found 1/30$394
This United Airlines deal was found by Cheapflights users on 1/30. 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.
Fri 7/109:42 am
DEC
-
SEA
2 stops14h 36m
United Airlines
Wed 7/2211:52 pm
SEA
-
DEC
1 stop6h 54m
United Airlines
Deal found 1/30$404
This United Airlines deal was found by Cheapflights users on 1/30. 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.
Sat 2/147:15 pm
DEC
-
SEA
1 stop18h 34m
United Airlines
Wed 2/1811:59 pm
SEA
-
DEC
1 stop6h 53m
United Airlines
Deal found 1/30$488
This United Airlines deal was found by Cheapflights users on 1/29. 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.
Sat 2/147:15 pm
DEC
-
PDX
1 stop29h 25m
United Airlines
Wed 2/1811:59 pm
PDX
-
DEC
1 stop6h 53m
United Airlines
Deal found 1/29$533
This United Airlines deal was found by Cheapflights users on 1/31. 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 2/157:15 pm
DEC
-
PDX
1 stop18h 40m
United Airlines
Thu 2/1910:56 am
PDX
-
DEC
1 stop19h 56m
United Airlines
Deal found 1/31$654

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 February 1, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$304
(United Airlines)
Provider with most accurate pricing for Decatur Arpt-Seattle/Tacoma Intl flight deals.
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Provider most trusted by Cheapflights users for Decatur Arpt-Seattle/Tacoma Intl flights.
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From Decatur Arpt to Washington
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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 February 1, 2026.
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

Fri 6/5

6:55 pm-11:59 pm

1 stop7h 04m

Seattle/Tacoma Intl

Sat 6/13

10:40 pm-8:46 am

1 stop8h 06m

$304

DecaturSeattle

DEC - SEA

DECSEA

Decatur Arpt

Fri 7/10

9:42 am-10:18 pm

2 stops14h 36m

Seattle/Tacoma Intl

Wed 7/22

11:52 pm-8:46 am

1 stop6h 54m

$404

DecaturSeattle

DEC - SEA

DECSEA

Decatur Arpt

Sat 2/14

7:15 pm-11:49 am

1 stop18h 34m

Seattle/Tacoma Intl

Wed 2/18

11:59 pm-8:52 am

1 stop6h 53m

$488

DecaturPortland

DEC - PDX

DECPDX

Decatur Arpt

Sat 2/14

7:15 pm-10:40 pm

1 stop29h 25m

Portland

Wed 2/18

11:59 pm-8:52 am

1 stop6h 53m

$533

DecaturPortland

DEC - PDX

DECPDX

Decatur Arpt

Sun 2/15

7:15 pm-11:55 am

1 stop18h 40m

Portland

Thu 2/19

10:56 am-8:52 am

1 stop19h 56m

$654

DecaturPortland

DEC - PDX

DECPDX

Decatur Arpt

Thu 6/11

6:55 pm-9:34 am

1 stop16h 39m

$306

DecaturSeattle

DEC - SEA

DECSEA

Decatur Arpt

Sat 2/7

7:09 pm-10:43 pm

1 stop29h 34m

$421

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/30

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, October is the cheapest month in which you can book a flight from Decatur, Illinois to State of Washington (average of $239). Flying from Decatur, Illinois to State of Washington in December is currently the most expensive (average of $404). 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 15h 26m. 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, October is the cheapest month in which you can book a flight from Decatur, Illinois to State of Washington (average of $239). Flying from Decatur, Illinois to State of Washington in December is currently the most expensive (average of $404). 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

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