HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Seattle

$258+ 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 3/10. Fares are subject to change and may not be available on all flights or dates of travel.
DEC — SEA
Feb 26 — Mar 51
Wed 2/26
Wed 3/5
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Decatur to Seattle with Cheapflights

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
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.
3. Compare prices and book
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 February 21, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$425
(United Airlines)

One-way from

$258
(United Airlines)
Provider with most accurate pricing for Decatur Arpt-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Decatur Arpt-Seattle/Tacoma Intl flights.
Search Deals
From Decatur Arpt to Seattle/Tacoma Intl
Search Deals
One-way flight from Decatur Arpt to Seattle/Tacoma Intl
Search Deals

Find 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 21, 2025.

This United Airlines deal was found by Cheapflights users on 2/20. 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 3/73:00 pmDEC - SEA
1 stop9h 39mUnited Airlines
Tue 3/1111:59 pmSEA - DEC
1 stop6h 51mUnited Airlines
Deal found 2/20$425

Find flights from Decatur to Seattle within your budget

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 21, 2025.

Fly from

Decatur

Fly to

Seattle

Route

Depart

Return

Price

DecaturSeattle

DEC - SEA

DECSEA

Decatur Arpt

Fri 3/7

3:00 pm-10:39 pm

1 stop9h 39m

Seattle/Tacoma Intl

Tue 3/11

11:59 pm-8:50 am

1 stop6h 51m

$425

DecaturSeattle

DEC - SEA

DECSEA

Decatur Arpt

Mon 3/10

9:50 am-11:49 am

1 stop27h 59m

$258

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/20

  • 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.

Travel insights for flights from Decatur to Seattle

Get recent, data-driven insights about flights from Decatur to Seattle including ideal travel times, pricing trends, and more.

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 July is currently the most expensive (average of $411). 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.

Rainfall in Seattle by month

Plan your trip to Seattle by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Seattle ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit Seattle when rainfall is around 0.7 in.

Temperature in Seattle by month

Plan your trip to Seattle by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Seattle, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated February 21, 2025.
United Airlines
7.4
Good
8,759 reviews

Comfort

7.3

Food

6.7

Entertainment

7.1

Overall

7.4

Crew

8.1

Boarding

7.7

Reviews

1 / 20

2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

United Airlines
7.4
Good
8,759 reviews
United Airlines
7.4
Good
8,759 reviews

Comfort

7.3

Food

6.7

Entertainment

7.1

Overall

7.4

Crew

8.1

Boarding

7.7

Reviews

1 / 20

2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

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.

  • What is the cheapest airline to fly from Decatur, Illinois to Seattle round-trip?

    Cheapflights users have booked flights from Decatur, Illinois to Seattle round-trip from $425.

  • 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, 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 July is currently the most expensive (average of $411). 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
SeaTac
Tukwila
Renton
Tacoma
Lacey
Ocean Shores
Leavenworth
Olympia
Federal Way
Centralia
Marysville
Cle Elum
Mukilteo
Aberdeen
Lakewood
Issaquah
Shoreline
Lynnwood
Shelton
Silverdale

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Decatur to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
O'Hare Intl to Seattle flights
St. Louis to Seattle flights
O'Hare Intl to Portland flights
Midway to Seattle flights
Midway to Portland flights
St. Louis to Portland flights
O'Hare Intl to Spokane flights
Peoria to Seattle flights
Moline to Portland flights
Midway to Spokane flights
Peoria to Portland flights
Bloomington to Seattle flights
Moline to Seattle flights
O'Hare Intl to Bellingham flights
St. Louis to Spokane flights
Bloomington to Portland flights
O'Hare Intl to Pullman flights
O'Hare Intl to Pasco flights
Decatur to Portland flights
Evansville to Spokane flights
Midway to Pasco flights
Moline to Spokane flights
St. Louis to Pasco flights
Peoria to Spokane flights
Dubuque to Portland flights
O'Hare Intl to Walla Walla flights
St. Louis to Yakima flights
Champaign to Portland flights
Evansville to Seattle flights
Dubuque to Seattle flights
Springfield to Seattle flights
O'Hare Intl to Wenatchee flights
O'Hare Intl to Yakima flights
Evansville to Portland flights
Springfield to Spokane flights
Bloomington to Spokane flights
Champaign to Seattle flights
Springfield to Portland flights
Moline to Pasco flights
Moline to Walla Walla flights
Paducah to Seattle flights
Peoria to Pasco flights
Springfield to Bellingham flights
St. Louis to Pullman flights
Quincy to Seattle flights
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.