Cheap Flights from Seattle to Illinois from $250 Return

Flight deals from Seattle to Illinois

Looking for cheap tickets from Seattle to Illinois, or a last-minute trip? Find the lowest prices on one-way and return tickets right here.

Chicago.$250 per passenger.Departing Wed, 12 Nov, returning Tue, 18 Nov.Return flight with Alaska Airlines and Hawaiian Airlines.Outbound direct flight with Alaska Airlines departs from Seattle / Tacoma International on Wed, 12 Nov, arriving in Chicago O'Hare International.Inbound direct flight with Hawaiian Airlines departs from Chicago O'Hare International on Tue, 18 Nov, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $250, select.

Decatur.$468 per passenger.Departing Thu, 18 Sep, returning Wed, 24 Sep.Return flight with United.Outbound indirect flight with United, departs from Seattle / Tacoma International on Thu, 18 Sep, arriving in Decatur.Inbound indirect flight with United, departs from Decatur on Wed, 24 Sep, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $468, select.

Moline.$642 per passenger.Departing Wed, 11 Jun, returning Wed, 18 Jun.Return flight with United.Outbound indirect flight with United, departs from Seattle / Tacoma International on Wed, 11 Jun, arriving in Moline.Inbound indirect flight with United, departs from Moline on Wed, 18 Jun, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $642, select.

Bloomington.$756 per passenger.Departing Tue, 15 Apr, returning Sat, 19 Apr.Return flight with Delta.Outbound indirect flight with Delta, departs from Seattle / Tacoma International on Tue, 15 Apr, arriving in Central Illinois Regional.Inbound indirect flight with Delta, departs from Central Illinois Regional on Sat, 19 Apr, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $756, select.

Peoria.$862 per passenger.Departing Mon, 14 Apr, returning Fri, 18 Apr.Return flight with Alaska Airlines and Allegiant Air.Outbound indirect flight with Alaska Airlines, departs from Seattle / Tacoma International on Mon, 14 Apr, arriving in Greater Peoria.Inbound indirect flight with Allegiant Air, departs from Greater Peoria on Fri, 18 Apr, arriving in Seattle / Tacoma International.Price includes taxes and charges.From $862, select.

Flying from Seattle to Illinois

Arm yourself with these facts on the fly.

Cheapest flight found	$250, Chicago
Cheapest month to fly	November
Average flight time	4 hrs, 5 mins
Cheapest airport to fly from	Seattle / Tacoma International
Most popular airline	American Airlines

How to find cheap flights from Seattle to Illinois

We've compared the best online travel agents and flight providers on the internet to find the cheapest plane tickets from Seattle to Illinois. Other savvy travellers recently found return flights from $250 and one-way tickets from $123 one-way. Ready to join them? Here are a few tips to help you do it the smart way.

Fly from Seattle / Tacoma International into Chicago

At the moment, the lowest priced flight tickets to Illinois are from Seattle / Tacoma International Airport to Chicago O'Hare International Airport.

Fly in May

We crunched the flight calendar and found the cheapest time to fly from Seattle to Illinois is currently May.

Fly on a Tuesday

From our data, we can see that Tuesday seems to be the cheapest time to fly from Seattle to Illinois.

Flex your dates for the best rates

If you’re flexible on your departure dates, you can use Skyscanner's whole month tool to find the cheapest day of the year to fly from Seattle to anywhere you choose in Illinois.

Watch as fares rise and fall

With Price Alerts, we'll let you know when flight prices from Seattle to Illinois go up or down so you can book when the time is just right.

Relax – these are fee-free flight tickets

With us, there are no added fees – the Seattle to Illinois flight price you see when you search with us is what you pay to the provider.

Frequently asked questions

What's the average Seattle to Illinois flight price?

We looked at all of the upcoming return flights from Seattle to Illinois we could find over the next 12 months. It looks like $250 is the best price. This is good, compared to the average Illinois ticket price of $469.

What is the cheapest month to fly from Seattle to Illinois?

The cheapest month to fly from Seattle to Decatur Airport is usually September. The cheapest month to fly from Seattle to Central Illinois Regional Airport is usually April. The cheapest month to fly from Seattle to Chicago O'Hare International Airport is usually November. And the cheapest month to fly from Seattle to Moline Airport is usually June.

Which upcoming date is cheapest to fly from Seattle to Illinois on?

After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Seattle to Illinois on Wednesday, 12 November 2025.

Are there any direct flights from Seattle to Illinois?

Seattle / Tacoma International Airport offers direct flights to Illinois.

If I'm flying from Seattle, where in Illinois is cheapest to fly into?

If you're flying from Seattle, the cheapest city in Illinois to fly into is Chicago. The cheapest airport serving Chicago at the moment is Chicago O'Hare International.