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Decatur

$227+ Cheap flights from Seattle to Decatur, IL (SEA - DEC)

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 2/18. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — DEC
Feb 26 — Mar 51
Thu 2/26
Thu 3/5
1 adult, Economy
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Cheap flight deals from Seattle to Decatur

Cheapest flights from Seattle to Decatur
Explore the most affordable flight options available from Seattle to Decatur. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 27, 2026.

This United Airlines deal was found by Cheapflights users on 1/25. 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 5/137:00 am
SEA
-
DEC
1 stop8h 58m
United Airlines
Mon 5/187:20 pm
DEC
-
SEA
1 stop25h 40m
United Airlines
Deal found 1/25$425
This United Airlines deal was found by Cheapflights users on 1/27. 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 2/117:00 am
SEA
-
DEC
1 stop9h 01m
United Airlines
Sun 2/159:50 am
DEC
-
SEA
2 stops13h 06m
United Airlines
Deal found 1/27$429
This United Airlines deal was found by Cheapflights users on 1/24. 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 1/307:00 am
SEA
-
DEC
1 stop9h 01m
United Airlines
Sun 2/19:49 am
DEC
-
SEA
2 stops15h 26m
United Airlines
Deal found 1/24$485
This United Airlines deal was found by Cheapflights users on 1/26. 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 2/107:00 am
SEA
-
DEC
1 stop9h 01m
United Airlines
Sat 2/147:15 pm
DEC
-
SEA
1 stop29h 28m
United Airlines
Deal found 1/26$489
This United Airlines deal was found by Cheapflights users on 1/26. 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 2/287:00 am
SEA
-
DEC
1 stop8h 54m
United Airlines
Sun 3/19:50 am
DEC
-
SEA
2 stops13h 06m
United Airlines
Deal found 1/26$505

Find flight deals from Seattle to Decatur

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Decatur (DEC). 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 January 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$425
(United Airlines)

One-way from

$227
(United Airlines)
Provider with most accurate pricing for Seattle/Tacoma Intl-Decatur Arpt flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Decatur Arpt flights.
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From Seattle/Tacoma Intl to Decatur Arpt
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One-way flight from Seattle/Tacoma Intl to Decatur Arpt
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Decatur 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 January 27, 2026.
Use the filters below to find and compare flights from Seattle to Decatur that are best for you.

Fly from

Seattle

Fly to

Decatur

Route

Depart

Return

Price

SeattleDecatur

SEA - DEC

SEADEC

Seattle/Tacoma Intl

Wed 5/13

7:00 am-5:58 pm

1 stop8h 58m

Decatur Arpt

Mon 5/18

7:20 pm-7:00 pm

1 stop25h 40m

$425

SeattleDecatur

SEA - DEC

SEADEC

Seattle/Tacoma Intl

Wed 2/11

7:00 am-6:01 pm

1 stop9h 01m

Decatur Arpt

Sun 2/15

9:50 am-8:56 pm

2 stops13h 06m

$429

SeattleDecatur

SEA - DEC

SEADEC

Seattle/Tacoma Intl

Tue 2/10

7:00 am-6:01 pm

1 stop9h 01m

Decatur Arpt

Sat 2/14

7:15 pm-10:43 pm

1 stop29h 28m

$489

SeattleDecatur

SEA - DEC

SEADEC

Seattle/Tacoma Intl

Sat 2/28

7:00 am-5:54 pm

1 stop8h 54m

Decatur Arpt

Sun 3/1

9:50 am-8:56 pm

2 stops13h 06m

$505

SeattleDecatur

SEA - DEC

SEADEC

Seattle/Tacoma Intl

Fri 5/15

11:48 pm-5:58 pm

1 stop16h 10m

Decatur Arpt

Mon 5/18

7:20 pm-11:37 am

2 stops18h 17m

$542

SeattleDecatur

SEA - DEC

SEADEC

Seattle/Tacoma Intl

Wed 2/18

7:00 am-8:52 am

1 stop23h 52m

$227

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/25

  • Most accurate provider: When it comes to deals on Seattle-Decatur, Illinois flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Decatur, Illinois flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Decatur, Illinois flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Decatur, Illinois 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 Seattle-Decatur, Illinois 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 Seattle to Decatur

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

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

Currently, January is the cheapest month in which you can book a flight from Seattle to Decatur, Illinois (average of $220). Flying from Seattle to Decatur, Illinois in July is currently the most expensive (average of $353). 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 Seattle to Decatur. 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 Seattle to Decatur, Illinois?

    A quick flight from Seattle to Decatur, Illinois can take about 8h 58m. United Airlines provides one of the quickest options available for as low as $425. The distance from Seattle to Decatur, Illinois is about 1736 mi.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Seattle to Decatur, Illinois (average of $220). Flying from Seattle to Decatur, Illinois in July is currently the most expensive (average of $353). 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 Decatur?

Book flights to Decatur if you plan to visit one of these locations
Mattoon
Effingham

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