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$310+ Cheap flights from Decatur, IL to Seattle (DEC - SEA)

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 2/26. Fares are subject to change and may not be available on all flights or dates of travel.
DEC — SEA
Jan 29 — Feb 51
Thu 1/29
Thu 2/5
1 adult, Economy
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Cheap flight deals from Decatur to Seattle

Best flights from Decatur to Seattle
Discover carefully curated flight deals from Decatur to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 30, 2025.

This United Airlines deal was found by Cheapflights users on 12/28. 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.
Thu 2/269:50 amDEC - SEA
2 stops14h 23mUnited Airlines
Mon 3/27:00 amSEA - DEC
1 stop8h 54mUnited Airlines
Deal found 12/28$310
This United Airlines deal was found by Cheapflights users on 12/28. 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.
Thu 2/269:50 amDEC - SEA
2 stops15h 40mUnited Airlines
Sun 3/111:59 pmSEA - DEC
1 stop6h 53mUnited Airlines
Deal found 12/28$314
This United Airlines deal was found by Cheapflights users on 12/27. 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.
Wed 1/219:49 amDEC - SEA
1 stop8h 12mUnited Airlines
Sat 1/247:00 amSEA - DEC
1 stop9h 01mUnited Airlines
Deal found 12/27$394
This United Airlines deal was found by Cheapflights users on 12/28. 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 5/296:55 pmDEC - SEA
1 stop17h 05mUnited Airlines
Sat 6/611:50 pmSEA - DEC
1 stop6h 56mUnited Airlines
Deal found 12/28$440

Find flight deals from Decatur to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Decatur (DEC) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 30, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
1 star

Round-trip from

$310
(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 Seattle/Tacoma Intl
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Decatur to Seattle 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 30, 2025.
Use the filters below to find and compare flights from Decatur to Seattle that are best for you.

Fly from

Decatur

Fly to

Seattle

Route

Depart

Return

Price

DecaturSeattle

DEC - SEA

DECSEA

Decatur Arpt

Thu 2/26

9:50 am-10:13 pm

2 stops14h 23m

Seattle/Tacoma Intl

Mon 3/2

7:00 am-5:54 pm

1 stop8h 54m

$310

DecaturSeattle

DEC - SEA

DECSEA

Decatur Arpt

Thu 2/26

9:50 am-11:30 pm

2 stops15h 40m

Seattle/Tacoma Intl

Sun 3/1

11:59 pm-8:52 am

1 stop6h 53m

$314

DecaturSeattle

DEC - SEA

DECSEA

Decatur Arpt

Wed 1/21

9:49 am-4:01 pm

1 stop8h 12m

Seattle/Tacoma Intl

Sat 1/24

7:00 am-6:01 pm

1 stop9h 01m

$394

DecaturSeattle

DEC - SEA

DECSEA

Decatur Arpt

Fri 5/29

6:55 pm-10:00 am

1 stop17h 05m

Seattle/Tacoma Intl

Sat 6/6

11:50 pm-8:46 am

1 stop6h 56m

$440

DecaturSeattle

DEC - SEA

DECSEA

Decatur Arpt

Sun 5/17

6:55 pm-3:53 pm

1 stop22h 58m

$441

DecaturSeattle

DEC - SEA

DECSEA

Decatur Arpt

Sat 1/3

7:09 pm-11:12 pm

2 stops30h 03m

$476

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/28

  • Most accurate provider: When it comes to deals on Decatur, Illinois-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Decatur, Illinois-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Decatur, Illinois-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Decatur, Illinois-Seattle flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Decatur, Illinois-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Decatur to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle 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 Seattle

What is the cheapest month to book a flight from Decatur, Illinois to Seattle?

Currently, October is the cheapest month in which you can book a flight from Decatur, Illinois to Seattle (average of $239). Flying from Decatur, Illinois to Seattle 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 Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Decatur, Illinois to Seattle?

    For as low as $310, United Airlines can have you in Seattle from Decatur, Illinois in 14h 23m. The distance from Decatur, Illinois to Seattle is about 1736 mi.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Decatur to Seattle 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 Seattle?

    Currently, October is the cheapest month in which you can book a flight from Decatur, Illinois to Seattle (average of $239). Flying from Decatur, Illinois to Seattle 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

Traveling to a place near Seattle?

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