Flights from San Diego to Illinois

Flight deals from San Diego to Illinois

Looking for a cheap last-minute deal or the best return flight from San Diego to Illinois? If you want to travel next month, return fares start from £184. Find the lowest prices on one-way and return tickets right here.

Chicago.£147 per passenger.Departing Tue, 22 Sep, returning Tue, 29 Sep.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from San Diego International on Tue, 22 Sep, arriving in Chicago Rockford.Inbound indirect flight with Frontier Airlines, departs from Chicago O'Hare International on Tue, 29 Sep, arriving in San Diego International.Price includes taxes and charges.From £147, select.

Moline.£199 per passenger.Departing Wed, 5 Aug, returning Thu, 13 Aug.Return flight with Frontier Airlines and Allegiant Air.Outbound indirect flight with Frontier Airlines, departs from San Diego International on Wed, 5 Aug, arriving in Moline.Inbound indirect flight with Allegiant Air, departs from Moline on Thu, 13 Aug, arriving in San Diego International.Price includes taxes and charges.From £199, select.

Chicago.£224 per passenger.Departing Tue, 9 Jun, returning Sat, 13 Jun.Return flight with United.Outbound direct flight with United departs from San Diego International on Tue, 9 Jun, arriving in Chicago O'Hare International.Inbound direct flight with United departs from Chicago O'Hare International on Sat, 13 Jun, arriving in San Diego International.Price includes taxes and charges.From £224, select.

Bloomington.£295 per passenger.Departing Tue, 23 Jun, returning Mon, 29 Jun.Return flight with Delta.Outbound indirect flight with Delta, departs from San Diego International on Tue, 23 Jun, arriving in Central Illinois Regional.Inbound indirect flight with Delta, departs from Central Illinois Regional on Mon, 29 Jun, arriving in San Diego International.Price includes taxes and charges.From £295, select.

Peoria.£328 per passenger.Departing Fri, 17 Jul, returning Tue, 21 Jul.Return flight with Frontier Airlines and Allegiant Air.Outbound indirect flight with Frontier Airlines, departs from San Diego International on Fri, 17 Jul, arriving in Greater Peoria.Inbound indirect flight with Allegiant Air, departs from Greater Peoria on Tue, 21 Jul, arriving in San Diego International.Price includes taxes and charges.From £328, select.

Marion.£361 per passenger.Departing Tue, 23 Jun, returning Mon, 29 Jun.Return flight with Frontier Airlines and Contour Airlines.Outbound indirect flight with Frontier Airlines, departs from San Diego International on Tue, 23 Jun, arriving in Marion.Inbound indirect flight with Contour Airlines, departs from Marion on Mon, 29 Jun, arriving in San Diego International.Price includes taxes and charges.From £361, select.

Decatur.£412 per passenger.Departing Sat, 20 Jun, returning Fri, 26 Jun.Return flight with United.Outbound indirect flight with United, departs from San Diego International on Sat, 20 Jun, arriving in Decatur.Inbound indirect flight with United, departs from Decatur on Fri, 26 Jun, arriving in San Diego International.Price includes taxes and charges.From £412, select.

Springfield.£484 per passenger.Departing Tue, 23 Jun, returning Mon, 29 Jun.Return flight with Frontier Airlines and Allegiant Air.Outbound indirect flight with Frontier Airlines, departs from San Diego International on Tue, 23 Jun, arriving in Springfield.Inbound indirect flight with Allegiant Air, departs from Springfield on Mon, 29 Jun, arriving in San Diego International.Price includes taxes and charges.From £484, select.

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Flying from San Diego to Illinois

Arm yourself with these facts on the fly.

Cheapest flight found	£147
Cheapest month to fly	September
Average flight time	4 hrs, 10 mins
Cheapest airport to fly from	San Diego International
Most popular airline	American Airlines

How to find cheap flights from San Diego to Illinois

We've compared the best online travel agents and flight providers on the internet to find the cheapest plane tickets from San Diego to Illinois. Other savvy travellers recently found return flights from £147 and one-way tickets from £69 one-way. Ready to join them? Here are a few tips to help you do it the smart way.

Fly from San Diego International into Chicago Rockford

At the moment, the lowest priced flight tickets to Illinois are from San Diego International Airport to Chicago Rockford Airport.

Fly in September

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

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 San Diego to anywhere you choose in Illinois.

Watch as fares rise and fall

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

We looked at all of the upcoming return flights from San Diego to Illinois we could find over the next 12 months. It looks like £147 is the best price. This is good, compared to the average Illinois ticket price of £306.

What is the cheapest month to fly from San Diego to Illinois?

The cheapest month to fly from San Diego to Springfield Airport is usually June. The cheapest month to fly from San Diego to Chicago Rockford Airport is usually September. The cheapest month to fly from San Diego to Moline Airport is usually August. And the cheapest month to fly from San Diego to Greater Peoria Airport is usually July.

Which upcoming date is cheapest to fly from San Diego to Illinois on?

After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from San Diego to Illinois on Tuesday, 22 September 2026.

Are there any direct flights from San Diego to Illinois?

San Diego International Airport offers direct flights to Illinois.

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

If you're flying from San Diego, the cheapest city in Illinois to fly into is Chicago. The cheapest airport serving Chicago at the moment is Chicago Rockford.