Cheap Flights from Key West to Illinois from CHF 133 Return

Flight deals from Key West to Illinois

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

Chicago.CHF 133 per passenger.Departing Fri, 6 Feb, returning Mon, 9 Feb.Return flight with Spirit Airlines.Outbound indirect flight with Spirit Airlines, departs from Key West International on Fri, 6 Feb, arriving in Chicago O'Hare International.Inbound indirect flight with Spirit Airlines, departs from Chicago O'Hare International on Mon, 9 Feb, arriving in Key West International.Price includes taxes and charges.From CHF 133, select.

Peoria.CHF 295 per passenger.Departing Sun, 11 Jan, returning Thu, 15 Jan.Return flight with Allegiant Air.Outbound indirect flight with Allegiant Air, departs from Key West International on Sun, 11 Jan, arriving in Greater Peoria.Inbound indirect flight with Allegiant Air, departs from Greater Peoria on Thu, 15 Jan, arriving in Key West International.Price includes taxes and charges.From CHF 295, select.

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Flying from Key West to Illinois

Arm yourself with these facts on the fly.

Cheapest flight found	CHF 133
Cheapest month to fly	February
Average flight time	3 hrs, 41 mins
Cheapest airport to fly from	Key West International
Most popular airline	Envoy Air

How to find cheap flights from Key West to Illinois

We've compared the best online travel agents and flight providers on the internet to find the cheapest plane tickets from Key West to Illinois. Other savvy travellers recently found return flights from CHF 133 and one-way tickets from CHF 67 one-way. Ready to join them? Here are a few tips to help you do it the smart way.

Fly from Key West International into Chicago O'Hare International

At the moment, the lowest priced flight tickets to Illinois are from Key West International Airport to Chicago O'Hare International Airport.

Fly in February

We crunched the flight calendar and found the cheapest time to fly from Key West to Illinois is currently February.

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 Key West to anywhere you choose in Illinois.

Watch as fares rise and fall

With Price Alerts, we'll let you know when flight prices from Key West 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 Illinois 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 Key West to Illinois flight price?

We looked at all of the upcoming return flights from Key West to Illinois we could find over the next 12 months. It looks like CHF 133 is the best price. This is good, compared to the average Illinois ticket price of CHF 214.

What is the cheapest month to fly from Key West to Illinois?

The cheapest month to fly from Key West to Chicago O'Hare International Airport is currently February. The cheapest month to fly from Key West to Greater Peoria Airport is usually January

Which upcoming date is cheapest to fly from Key West to Illinois on?

After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Key West to Illinois on Friday, 6 February 2026.

Are there any direct flights from Key West to Illinois?

Key West International Airport offers direct flights to Illinois.

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

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

How long is the flight from Key West to Illinois?

The average flight time between Key West and Illinois is 3 hours and 41 minutes.

Flights from Key West to Illinois