Cheap Flights from Seattle to Illinois from HK$1,183 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.HK$1,183 per passenger.Departing Sat, 30 Aug, returning Sat, 6 Sep.Return flight with Hawaiian Airlines.Outbound indirect flight with Hawaiian Airlines, departs from Seattle / Tacoma International on Sat, 30 Aug, arriving in Chicago O'Hare International.Inbound indirect flight with Hawaiian Airlines, departs from Chicago O'Hare International on Sat, 6 Sep, arriving in Seattle / Tacoma International.Price includes taxes and charges.From HK$1,183, select.

Decatur.HK$2,269 per passenger.Departing Fri, 19 Sep, returning Mon, 22 Sep.Return flight with United.Outbound indirect flight with United, departs from Seattle / Tacoma International on Fri, 19 Sep, arriving in Decatur.Inbound indirect flight with United, departs from Decatur on Mon, 22 Sep, arriving in Seattle / Tacoma International.Price includes taxes and charges.From HK$2,269, select.

Bloomington.HK$2,825 per passenger.Departing Wed, 10 Sep, returning Sat, 20 Sep.Return flight with Delta.Outbound indirect flight with Delta, departs from Seattle / Tacoma International on Wed, 10 Sep, arriving in Central Illinois Regional.Inbound indirect flight with Delta, departs from Central Illinois Regional on Sat, 20 Sep, arriving in Seattle / Tacoma International.Price includes taxes and charges.From HK$2,825, select.

Peoria.HK$2,998 per passenger.Departing Wed, 6 Aug, returning Thu, 14 Aug.Return flight with United.Outbound indirect flight with United, departs from Seattle / Tacoma International on Wed, 6 Aug, arriving in Greater Peoria.Inbound indirect flight with United, departs from Greater Peoria on Thu, 14 Aug, arriving in Seattle / Tacoma International.Price includes taxes and charges.From HK$2,998, select.

Moline.HK$3,700 per passenger.Departing Fri, 15 Aug, returning Sun, 7 Sep.Return flight with United.Outbound indirect flight with United, departs from Seattle / Tacoma International on Fri, 15 Aug, arriving in Moline.Inbound indirect flight with United, departs from Moline on Sun, 7 Sep, arriving in Seattle / Tacoma International.Price includes taxes and charges.From HK$3,700, select.

Flying from Seattle to Illinois

Arm yourself with these facts on the fly.

Cheapest flight found	HK$1,183, Chicago
Cheapest month to fly	August
Average flight time	3 hrs, 55 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 HK$1,183 and one-way tickets from HK$686 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 September

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

Fly on a Saturday

From our data, we can see that Saturday 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 HK$1,183 is the best price. This is good, compared to the average Illinois ticket price of HK$2,595.

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

The cheapest month to fly from Seattle to Moline Airport is usually August. The cheapest month to fly from Seattle to Chicago O'Hare International Airport is usually August. The cheapest month to fly from Seattle to Decatur Airport is usually September. And the cheapest month to fly from Seattle to Greater Peoria Airport is usually August.

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 Saturday, 30 August 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.