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$392+ 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 6/11. Fares are subject to change and may not be available on all flights or dates of travel.
DEC — SEA
Mar 13 — Mar 201
Fri 3/13
Fri 3/20
1 adult, Economy
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Cheap flight deals from Decatur to Seattle

Cheapest flights from Decatur to Seattle
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 February 11, 2026.

This United Airlines deal was found by Cheapflights users on 2/7. 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 6/116:55 pm
DEC
-
SEA
1 stop7h 04m
United Airlines
Sat 6/1310:40 pm
SEA
-
DEC
1 stop17h 11m
United Airlines
Deal found 2/7$392
This United Airlines deal was found by Cheapflights users on 2/8. 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 4/137:20 pm
DEC
-
SEA
1 stop6h 59m
United Airlines
Mon 4/207:00 am
SEA
-
DEC
1 stop8h 57m
United Airlines
Deal found 2/8$394
This United Airlines deal was found by Cheapflights users on 2/8. 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 4/137:20 pm
DEC
-
SEA
1 stop6h 59m
United Airlines
Tue 4/215:45 pm
SEA
-
DEC
2 stops13h 13m
United Airlines
Deal found 2/8$404
This United Airlines deal was found by Cheapflights users on 2/9. 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 4/147:20 pm
DEC
-
SEA
1 stop29h 17m
United Airlines
Mon 4/207:00 am
SEA
-
DEC
1 stop8h 57m
United Airlines
Deal found 2/9$411
This United Airlines deal was found by Cheapflights users on 2/8. 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 4/147:20 pm
DEC
-
SEA
1 stop18h 28m
United Airlines
Sun 4/197:00 am
SEA
-
DEC
1 stop8h 57m
United Airlines
Deal found 2/8$414
This United Airlines deal was found by Cheapflights users on 2/9. 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 4/147:20 pm
DEC
-
SEA
1 stop25h 40m
United Airlines
Tue 4/217:37 pm
SEA
-
DEC
2 stops11h 21m
United Airlines
Deal found 2/9$421

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 February 11, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$392
(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 February 11, 2026.
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 6/11

6:55 pm-11:59 pm

1 stop7h 04m

Seattle/Tacoma Intl

Sat 6/13

10:40 pm-5:51 pm

1 stop17h 11m

$392

DecaturSeattle

DEC - SEA

DECSEA

Decatur Arpt

Mon 4/13

7:20 pm-12:19 am

1 stop6h 59m

Seattle/Tacoma Intl

Sun 4/19

10:35 pm-8:58 am

1 stop8h 23m

$394

DecaturSeattle

DEC - SEA

DECSEA

Decatur Arpt

Mon 4/13

7:20 pm-12:19 am

1 stop6h 59m

Seattle/Tacoma Intl

Mon 4/20

7:00 am-5:57 pm

1 stop8h 57m

$394

DecaturSeattle

DEC - SEA

DECSEA

Decatur Arpt

Mon 4/13

7:20 pm-12:19 am

1 stop6h 59m

Seattle/Tacoma Intl

Tue 4/21

5:45 pm-8:58 am

2 stops13h 13m

$404

DecaturSeattle

DEC - SEA

DECSEA

Decatur Arpt

Tue 4/14

7:20 pm-10:37 pm

1 stop29h 17m

Seattle/Tacoma Intl

Mon 4/20

7:00 am-5:57 pm

1 stop8h 57m

$411

DecaturSeattle

DEC - SEA

DECSEA

Decatur Arpt

Tue 4/14

7:20 pm-7:00 pm

1 stop25h 40m

Seattle/Tacoma Intl

Tue 4/21

7:00 am-5:57 pm

1 stop8h 57m

$411

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/7

  • 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 $234). Flying from Decatur, Illinois to Seattle 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 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 $392, United Airlines can have you in Seattle from Decatur, Illinois in 7h 04m. 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 $234). Flying from Decatur, Illinois to Seattle 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

Traveling to a place near Seattle?

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