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Cheap flights from Seattle to Decatur from $454

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Decatur departing on 9/22. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Seattle to Decatur

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
10:47 pm - 8:46 am
SEA
-
DEC
7h 59m
1 stop
United Airlines Logo
6:55 pm - 12:14 am
DEC
-
SEA
7h 19m
1 stop
$454United Airlines
Tue, Sep 22 - Sat, Sep 26
United Airlines Logo
6:51 pm - 8:46 am
SEA
-
DEC
11h 55m
2 stops
United Airlines Logo
6:55 pm - 12:14 am
DEC
-
SEA
7h 19m
1 stop
$464United Airlines
Tue, Sep 22 - Sat, Sep 26
United Airlines Logo
6:51 pm - 8:46 am
SEA
-
DEC
11h 55m
2 stops
United Airlines Logo
6:55 pm - 10:01 am
DEC
-
SEA
17h 06m
2 stops
$543United Airlines
Tue, Sep 22 - Sat, Sep 26

United Airlines flights from Seattle to Decatur, Illinois

Our best United Airlines deals on Seattle to Decatur, Illinois flight tickets
United Airlines
Sep 22
SEA10:47 pmSeattle/Tacoma Intl
7h 59m
1 stop
DEC8:46 amDecatur Arpt
Sep 26
DEC6:55 pmDecatur Arpt
7h 19m
1 stop
SEA12:14 amSeattle/Tacoma Intl
$454
United Airlines
Sep 22
SEA7:35 pmSeattle/Tacoma Intl
11h 11m
2 stops
DEC8:46 amDecatur Arpt
Sep 26
DEC6:55 pmDecatur Arpt
7h 19m
1 stop
SEA12:14 amSeattle/Tacoma Intl
$464
United Airlines
Sep 22
SEA6:51 pmSeattle/Tacoma Intl
11h 55m
2 stops
DEC8:46 amDecatur Arpt
Sep 26
DEC6:55 pmDecatur Arpt
17h 06m
2 stops
SEA10:01 amSeattle/Tacoma Intl
$543

momondo Fare Finder

 
Customize your flight search to find flights from Seattle to Decatur, Illinois 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, momondo users made 832,500 searches. Data last updated May 12, 2026.
Use the filters below to find and compare flights from Seattle to Decatur, Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

SeattleDecatur

SEA - DEC

SEADEC

Seattle/Tacoma Intl

Tue 9/22

10:47 pm-8:46 am

1 stop7h 59m

Decatur Arpt

Sat 9/26

6:55 pm-12:14 am

1 stop7h 19m

$454

SeattleDecatur

SEA - DEC

SEADEC

Seattle/Tacoma Intl

Tue 9/22

6:51 pm-8:46 am

2 stops11h 55m

Decatur Arpt

Sat 9/26

6:55 pm-12:14 am

1 stop7h 19m

$464

SeattleDecatur

SEA - DEC

SEADEC

Seattle/Tacoma Intl

Tue 9/22

6:51 pm-8:46 am

2 stops11h 55m

Decatur Arpt

Sat 9/26

6:55 pm-10:01 am

2 stops17h 06m

$543

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

When to book flights from Seattle to Decatur, Illinois

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to Decatur, Illinois according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Seattle to Decatur, Illinois (SEA to DEC) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Decatur, Illinois

Fastest flight time

7h 59m

Direct flights

None
The fastest flight from Seattle to Decatur, Illinois takes 7h 59m
There are no direct flights from Seattle to Decatur, Illinois. There are no popular flight routes from Seattle to Decatur, Illinois.
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Frequently asked questions about flying from Seattle to Decatur, Illinois

  • How far is Seattle/Tacoma Intl to Decatur Arpt by plane?

    The straight-line distance from Seattle/Tacoma Intl to Decatur Arpt is 1734.6 mi. A reasonable flight in good conditions will take 7h 59m.

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Decatur Arpt Airport?

    Prices for flights from Seattle/Tacoma Intl Airport to Decatur Arpt Airport are updated daily.

  • How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Decatur Arpt Airport?

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to Decatur Arpt Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Decatur Arpt Airport.

  • What documentation or ID do you need to fly to Decatur Arpt Airport?

    The necessary travel and health documents for your Decatur Arpt Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Seattle to Decatur, Illinois?

Best airlines flying from Seattle to Decatur, Illinois

Compare and see reviews for airlines that fly from Seattle to Decatur, Illinois with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $304Free CancellationRating
7.4
9,701 reviews
Search United Airlines flights

Frequently asked questions about flying from Seattle to Decatur, Illinois

  • How do I get Price Alerts for flights from Seattle to Decatur, Illinois?

    Confirm your travel details to search for the latest offers for flights from Seattle to Decatur, Illinois. While browsing offers there will be the option to toggle “Price Alerts”. You’ll then receive updates when prices for the flight route increase or decrease.

  • How can I save money on flights from Seattle to Decatur, Illinois with momondo?

    Plan your trips smart with the “Price Forecast” feature, which uses flight data to help you pick the best days to fly for the lowest fares. Our “Price Calendar” helps you get the most for your money by showing you when it’s most advantageous to fly. Curate your own travel experiences for less with “Explore”. Expert travel hacks to fuel your next adventure are a click away with “Discover” by momondo. Set up our “Price Alerts” to track fare changes and book when prices are at their lowest point.

  • How does momondo find its flight prices?

    We compare prices from 700+ competitors to help you find the price that works best for you. momondo operates in over 30 international markets, bringing you access to a wide range of fares and deals. Search for your travel using momondo for a diverse range of options from airlines and OTAs.

Traveling to a place near Decatur?

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

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Decatur?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Seattle to Decatur. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Seattle to Decatur with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Decatur from Seattle with this policy.

How can momondo help me find flights from Seattle to Decatur?

Once you have performed a search for Seattle to Decatur flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Seattle to Decatur right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Seattle to Decatur now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Decatur and let you know when they change.

An easier way to manage your Decatur, Illinois trip

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