Cheap Flights from San Francisco International Airport to Illinois from HK$1,197 Return

Flight deals from San Francisco International Airport to Illinois

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

Chicago.HK$1,197 per passenger.Departing Wed, 24 Sep, returning Wed, 1 Oct.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from San Francisco International on Wed, 24 Sep, arriving in Chicago O'Hare International.Inbound indirect flight with Frontier Airlines, departs from Chicago O'Hare International on Wed, 1 Oct, arriving in San Francisco International.Price includes taxes and charges.From HK$1,197, select.

Peoria.HK$2,639 per passenger.Departing Tue, 16 Sep, returning Sat, 20 Sep.Return flight with United.Outbound indirect flight with United, departs from San Francisco International on Tue, 16 Sep, arriving in Greater Peoria.Inbound indirect flight with United, departs from Greater Peoria on Sat, 20 Sep, arriving in San Francisco International.Price includes taxes and charges.From HK$2,639, select.

Decatur.HK$2,915 per passenger.Departing Thu, 11 Sep, returning Mon, 15 Sep.Return flight with United.Outbound indirect flight with United, departs from San Francisco International on Thu, 11 Sep, arriving in Decatur.Inbound indirect flight with United, departs from Decatur on Mon, 15 Sep, arriving in San Francisco International.Price includes taxes and charges.From HK$2,915, select.

Bloomington.HK$3,256 per passenger.Departing Fri, 5 Sep, returning Mon, 8 Sep.Return flight with Frontier Airlines and Allegiant Air.Outbound indirect flight with Frontier Airlines, departs from San Francisco International on Fri, 5 Sep, arriving in Central Illinois Regional.Inbound indirect flight with Allegiant Air, departs from Central Illinois Regional on Mon, 8 Sep, arriving in San Francisco International.Price includes taxes and charges.From HK$3,256, select.

Moline.HK$3,443 per passenger.Departing Tue, 2 Sep, returning Sat, 6 Sep.Return flight with Delta.Outbound indirect flight with Delta, departs from San Francisco International on Tue, 2 Sep, arriving in Moline.Inbound indirect flight with Delta, departs from Moline on Sat, 6 Sep, arriving in San Francisco International.Price includes taxes and charges.From HK$3,443, select.

Flying from San Francisco International Airport to Illinois

Arm yourself with these facts on the fly.

Cheapest flight found	HK$1,197, Chicago
Cheapest month to fly	September
Average flight time	4 hrs, 12 mins
Average flights per week	819
Most popular airline	United

How to find cheap flights from San Francisco International Airport to Illinois

We've compared the best online travel agents and flight providers on the internet to find the cheapest plane tickets from San Francisco International Airport to Illinois. Other savvy travellers recently found return flights from HK$1,197 and one-way tickets from HK$668. Ready to join them? Here are a few tips to help you do it the smart way.

Fly in September

The cheapest time to fly from San Francisco International Airport to Illinois is currently September.

Fly on a Friday

From our data, we can see that Friday seems to be the cheapest time to fly from San Francisco International Airport 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 San Francisco International Airport 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 Francisco International Airport to your chosen airport in 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 San Francisco International Airport to Illinois flight price you see when you search with us is what you pay to the provider.

Frequently asked questions

Are there any direct flights from San Francisco International Airport to Illinois?

Yes - direct flights currently operate from San Francisco International Airport to Chicago O'Hare International Airport in Illinois.

What is the average price of a flight from San Francisco International Airport to Illinois?

We looked at all of the upcoming return flights from San Francisco International Airport to Illinois we could find over the next 12 months. It looks like HK$1,197 is the best price. This is good, compared to the average Illinois ticket price of HK$2,690.

What is the cheapest month to fly from San Francisco International Airport to Illinois?

The cheapest month to fly from San Francisco International Airport to Central Illinois Regional Airport is currently September.
The cheapest month to fly from San Francisco International Airport to Greater Peoria Airport is currently September.
The cheapest month to fly from San Francisco International Airport to Moline Airport is currently September.
And the cheapest month to fly from San Francisco International Airport to Chicago O'Hare International Airport is usually September.

Which upcoming date is cheapest to fly from San Francisco International Airport to Illinois on?

After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from San Francisco International Airport to Illinois on Wednesday, 24 September 2025.

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

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