$237+ Cheap flights from Decatur, IL to Seattle (DEC - SEA)
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 9/20. Fares are subject to change and may not be available on all flights or dates of travel.
DEC — SEA
août 18 — août 251
1 adult, Economy
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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
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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 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 août 13, 2025.
Round-trip from | $374 (United Airlines) |
|---|---|
One-way from | $237 (United Airlines) |
Find flight deals from Decatur to Seattle
Cheapest flights from Decatur to SeattleExplore the most affordable flight options available from Decatur to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on août 13, 2025.
Explore the most affordable flight options available from Decatur to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on août 13, 2025.
This United Airlines deal was found by Cheapflights users on 8/12. 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.
mer. 10/229:38 amDEC - SEA
1 stop8h 07mUnited Airlines
lun. 10/277:00 amSEA - DEC
1 stop8h 52mUnited Airlines
Deal found 8/12![United Airlines logo]()
$374
This United Airlines deal was found by Cheapflights users on 8/11. 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.
mer. 9/249:42 amDEC - SEA
1 stop7h 50mUnited Airlines
dim. 9/2811:40 pmSEA - DEC
1 stop7h 11mUnited Airlines
Deal found 8/11![United Airlines logo]()
$425
This United Airlines deal was found by Cheapflights users on 8/11. 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.
mar. 8/129:45 amDEC - SEA
2 stops13h 03mUnited Airlines
ven. 8/152:24 pmSEA - DEC
2 stops16h 24mUnited Airlines
Deal found 8/11![United Airlines logo]()
$856
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 août 13, 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
mer. 10/22
9:38 am-3:45 pm
1 stop8h 07m
Seattle/Tacoma Intl
lun. 10/27
7:00 am-5:52 pm
1 stop8h 52m
$374
DecaturSeattle
DEC - SEA
DECSEA
Decatur Arpt
mer. 9/24
9:42 am-3:32 pm
1 stop7h 50m
Seattle/Tacoma Intl
dim. 9/28
11:40 pm-8:51 am
1 stop7h 11m
$425
DecaturSeattle
DEC - SEA
DECSEA
Decatur Arpt
sam. 9/20
9:42 am-10:20 pm
1 stop14h 38m
$237
DecaturSeattle
DEC - SEA
DECSEA
Decatur Arpt
dim. 9/21
9:42 am-9:43 am
1 stop26h 01m
$267
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, January is the cheapest month in which you can book a flight from Decatur, Illinois to Seattle (average of $238). Flying from Decatur, Illinois to Seattle in June is currently the most expensive (average of $389). 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.
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