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Decatur

$287+ 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 12/28. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — DEC
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
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 December 12, 2025.

This United Airlines deal was found by Cheapflights users on 12/10. 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 12/2911:59 pmSEA - DEC
1 stop7h 06mUnited Airlines
Sun 1/47:09 pmDEC - SEA
1 stop18h 54mUnited Airlines
Deal found 12/10$489
This United Airlines deal was found by Cheapflights users on 12/11. 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.
Fri 12/267:00 amSEA - DEC
1 stop8h 59mUnited Airlines
Sun 1/47:09 pmDEC - SEA
2 stops30h 03mUnited Airlines
Deal found 12/11$499
This United Airlines deal was found by Cheapflights users on 12/10. 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 12/307:00 amSEA - DEC
1 stop8h 59mUnited Airlines
Sun 1/47:09 pmDEC - SEA
1 stop18h 54mUnited Airlines
Deal found 12/10$515
This United Airlines deal was found by Cheapflights users on 12/11. 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.
Sat 12/277:00 amSEA - DEC
1 stop8h 59mUnited Airlines
Sun 1/47:09 pmDEC - SEA
2 stops28h 08mUnited Airlines
Deal found 12/11$525
This United Airlines deal was found by Cheapflights users on 12/10. 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 12/2911:59 pmSEA - DEC
1 stop7h 06mUnited Airlines
Sat 1/37:09 pmDEC - SEA
1 stop29h 38mUnited Airlines
Deal found 12/10$559
This United Airlines deal was found by Cheapflights users on 12/11. 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.
Sun 12/287:00 amSEA - DEC
1 stop8h 59mUnited Airlines
Sun 1/49:44 amDEC - SEA
1 stop28h 19mUnited Airlines
Deal found 12/11$565
This United Airlines deal was found by Cheapflights users on 12/10. 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 12/307:12 pmSEA - DEC
2 stops11h 53mUnited Airlines
Sat 1/37:09 pmDEC - SEA
1 stop29h 38mUnited Airlines
Deal found 12/10$569

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 December 12, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$394
(United Airlines)

One-way from

$287
(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 December 12, 2025.
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 1/28

7:00 am-6:01 pm

1 stop9h 01m

Decatur Arpt

Sat 1/31

7:09 pm-4:01 pm

1 stop22h 52m

$394

SeattleDecatur

SEA - DEC

SEADEC

Seattle/Tacoma Intl

Wed 2/4

7:00 am-6:01 pm

1 stop9h 01m

Decatur Arpt

Sun 2/8

9:49 am-4:01 pm

1 stop8h 12m

$394

SeattleDecatur

SEA - DEC

SEADEC

Seattle/Tacoma Intl

Tue 1/6

7:00 am-6:01 pm

1 stop9h 01m

Decatur Arpt

Sat 1/10

7:09 pm-11:32 am

1 stop18h 23m

$404

SeattleDecatur

SEA - DEC

SEADEC

Seattle/Tacoma Intl

Fri 1/16

12:57 pm-6:01 pm

2 stops27h 04m

Decatur Arpt

Sun 1/18

9:49 am-9:12 pm

3 stops13h 23m

$424

SeattleDecatur

SEA - DEC

SEADEC

Seattle/Tacoma Intl

Sun 12/28

11:59 pm-5:59 pm

1 stop16h 00m

$287

SeattleDecatur

SEA - DEC

SEADEC

Seattle/Tacoma Intl

Tue 12/30

3:50 pm-9:05 am

2 stops15h 15m

$316

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/10

Compare providers for flights from Seattle to Decatur

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Decatur in December.
ProviderPrice AccuracyTrust Score*
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seattle-Decatur, Illinois flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Seattle-Decatur, Illinois flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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 $356). 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 9h 01m. United Airlines provides one of the quickest options available for as low as $394. 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 $356). 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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