£340 Cheap Flights to Illinois

View £340 flight on Wed, 2 Sept 2026Opens in a new window

Popular airlines to Illinois

  • Frontier Airlines

  • American Airlines

  • Delta

  • United

  • Alaska Airlines

  • JetBlue Airways

  • Southwest Airlines

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Cheap round-trip flights to Illinois

Prices were available within the past 7 days and start at £340 for one-way flights and £477 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

TAP Portugal
Sat, 21 Nov - Sun, 29 Nov
LHR
London
ORD
Chicago
£478 Return, just found
£478
Return
just found
Select TAP Portugal flight, departing Sat, 21 Nov from London to Chicago, returning Sun, 29 Nov, priced at £478 just found
American Airlines
Tue, 17 Nov - Sat, 28 Nov
LHR
London
ORD
Chicago
£492 Return, found 1 day ago
£492
Return
found 1 day ago
Select American Airlines flight, departing Tue, 17 Nov from London to Chicago, returning Sat, 28 Nov, priced at £492 found 1 day ago
Icelandair
Wed, 17 Feb - Sun, 21 Feb
LHR
London
ORD
Chicago
£503 Return, just found
£503
Return
just found
Select Icelandair flight, departing Wed, 17 Feb from London to Chicago, returning Sun, 21 Feb, priced at £503 just found
Scandinavian Airlines
Thu, 25 Feb - Thu, 4 Mar
MAN
Manchester
ORD
Chicago
£530 Return, found 2 days ago
£530
Return
found 2 days ago
Select Scandinavian Airlines flight, departing Thu, 25 Feb from Manchester to Chicago, returning Thu, 4 Mar, priced at £530 found 2 days ago
Swiss International Air Lines
Wed, 2 Sept - Sun, 20 Sept
LHR
London
STL
St. Louis
£555 Return, found 1 hour ago
£555
Return
found 1 hour ago
Select Swiss International Air Lines flight, departing Wed, 2 Sept from London to St. Louis, returning Sun, 20 Sept, priced at £555 found 1 hour ago
Austrian Airlines
Tue, 22 Sept - Sat, 26 Sept
LHR
London
ORD
Chicago
£558 Return, just found
£558
Return
just found
Select Austrian Airlines flight, departing Tue, 22 Sept from London to Chicago, returning Sat, 26 Sept, priced at £558 just found
KLM
Sun, 13 Sept - Thu, 17 Sept
LHR
London
MDW
Chicago
£626 Return, found 3 days ago
£626
Return
found 3 days ago
Select KLM flight, departing Sun, 13 Sept from London to Chicago, returning Thu, 17 Sept, priced at £626 found 3 days ago
British Airways
Tue, 3 Nov - Tue, 24 Nov
MAN
Manchester
STL
St. Louis
£646 Return, found 1 day ago
£646
Return
found 1 day ago
Select British Airways flight, departing Tue, 3 Nov from Manchester to St. Louis, returning Tue, 24 Nov, priced at £646 found 1 day ago
Virgin Atlantic
Wed, 18 Nov - Sun, 29 Nov
MAN
Manchester
MDW
Chicago
£700 Return, found 2 days ago
£700
Return
found 2 days ago
Select Virgin Atlantic flight, departing Wed, 18 Nov from Manchester to Chicago, returning Sun, 29 Nov, priced at £700 found 2 days ago
American Airlines
Tue, 10 Nov - Mon, 16 Nov
LHR
London
SPI
Springfield
£723 Return, found 9 hours ago
£723
Return
found 9 hours ago
Select American Airlines flight, departing Tue, 10 Nov from London to Springfield, returning Mon, 16 Nov, priced at £723 found 9 hours ago

Trending flights to Illinois

These prices were available within the past 7 days. Prices quoted are per person, return, for the period specified. Prices and availability are subject to change. Additional terms apply.

TAP Portugal
Sat, 21 Nov - Sun, 29 Nov
LGW
London
ORD
Chicago
£477 Return, just found
£477
Return
just found
Select TAP Portugal flight, departing Sat, 21 Nov from London to Chicago, returning Sun, 29 Nov, priced at £477 just found

Frequently asked questions

How do I find cheap flights to Illinois that have flexible change policies?
Search for cheap flights to Illinois, then tick the "No change fee" box under the "Flexible change policies" heading. From then on it's smooth sailing. We understand that travel plans change and flexibility is essential, so book with confidence with Expedia.
Which airlines fly to Illinois?
Whether you're travelling somewhere new or rendezvousing at a favourite haunt, these airlines are waiting to take you into or near Illinois:

  • United Airlines - 13,063 flights to or near Illinois each month, including 12,950 flights to O'Hare Intl. Airport (ORD) and 108 flights to Quad City Intl. Airport (MLI) per month.
  • American Airlines - 8,977 flights to or near Illinois each month, including 8,855 flights to O'Hare Intl. Airport (ORD) and 121 flights to Quad City Intl. Airport (MLI) per month.
  • Southwest Airlines - 5,997 flights to or near Illinois each month, including 5,334 flights to Midway Intl. Airport (MDW) and 663 flights to O'Hare Intl. Airport (ORD) per month.

How can I find cheap tickets to Illinois?
One of the easiest ways to find cheap tickets to Illinois is to be flexible with your travel dates. Search for your flights, then click "flexible dates" at the top of your results. It'll reveal the cheapest prices for nearby days. The lowest price for a flight to Illinois in the last seven days was £477. Booking well in advance will generally help you score an even bigger bargain.
How much is a flight to Illinois?
There were plenty of bargain fares up for grabs in the last seven days, with the cost of a return airfare to Illinois ranging between £477 and £723. Many lucky travellers nabbed one-way tickets from London (LHR) for as little as £340.
What are the most popular airports to fly into in Illinois?
Touch down at one of these top Illinois airports and you'll be perfectly placed to discover all that this wonderful region has to offer:

  • O'Hare Intl. Airport (ORD) - 25,318 flights per month.
  • Midway Intl. Airport (MDW) - 5,962 flights per month.
  • Quad City Intl. Airport (MLI) - 325 flights per month.

When is the cheapest time to fly to Illinois?
Take off for Illinois early in the week and you'll usually be rewarded more economical fares. Tuesday is typically the cheapest day to hop on a plane, followed by Monday. If you're hoping to avoid the most expensive flights, steer clear of Saturdays.
How much is a plane ticket to Illinois?
In the last seven days, plane fares to Illinois ranged from £477 to £723.
What is the best time to go to Illinois?
A terrific time to check out Chicago is after June 20 when the summer season starts. In Illinois's main city, average temperatures range from 18ºC to 24ºC at this time — ideal weather for sightseeing! May, June and August are the most popular months to head to this hot spot.
What months are the cheapest to book a flight to Illinois?
The top month to purchase affordable flights to Illinois is February. Remember that in the U.S, an expensive time to reserve a ticket is during the busy month of December.

Book with confidence

Top tips for booking flights to Illinois from UK

Get ready to fly to Illinois

Prepare your luggage and book your flights to Illinois with Expedia. We offer a seamless flight booking experience, with a wide range of Illinois plane tickets to choose from. If you need help finding some of the best deals for cheap flights to Illinois in 2026, we are always available to assist you. Book your flights to Illinois today and let the adventure begin!

Find the best tickets to Illinois

To find some of the best tickets to Illinois in 2026, use Expedia's powerful search engine to compare dates and the different departure and arrival airports for your trip. Whether you're after direct flights to Illinois or last-minute flights to Illinois, you can filter and sort your search results, making it easy to find the ideal flight to Illinois.

Airlines fly to Illinois

There are 20 different airlines that fly to Illinois including some of the most trusted names in the business. To book flights to Illinois with your favourite airline, take a look at Expedia's flight listings and try out different dates to find some of the best Illinois plane tickets.

Find the cheapest flights to Illinois

By booking early you may find some of the best deals for Illinois flights from the UK, including Illinois direct flights. You can usually find affordable and cheap flights to Illinois, whether one-way from £340 or round-trip from £477, with Expedia if you book your trip far enough in advance.

Find the best airports for cheap flights to Illinois

Try searching for different Illinois airports with Expedia to find some of the cheapest flights to Illinois. Flights from London (LHR) to Chicago (ORD) usually have the lowest price from £340.

Why book your flights to Illinois with Expedia

Expedia offers great deals on Illinois air fares from £340 to cater to every budget. Not only is Expedia one of the top platforms to book flights to Illinois from the UK, it is also your one-stop shop for booking hotels, car rentals, and more.

 

*Prices and availability are subject to change. Additional terms apply.

Top tips for booking flights to Illinois from UK

Travel information

Illinois Flights Information

Airlines serving
Swiss International Air Lines, Icelandair, American Airlines, KLM, British Airways, TAP Portugal, Scandinavian Airlines, Austrian Airlines, Virgin Atlantic
Roundtrip price
from £477
Illinois Flights Information

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