Find flights
When to book
Airlines
FAQs

Cheap flights from Illinois to London, ON from C$ 473

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 15/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — YXU
6 Aug — 13 Aug1
1 adult

Cheap flight deals from Illinois to London

Keep the following information in mind while searching for Illinois to London flight deals. Data was last updated 1 August 2025.

Round-trip from

C$ 673
13/9-20/9
  • 13/9-20/9
  • 4 total stops
  • 33h 00m total
  • Illinois to London
Search Deals

Find flight deals from Illinois to London

Cheapest flights from Illinois to London
Explore the most affordable flight options available from Illinois to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 1 August 2025.

Mon 15/95:30 p.m.ORD - YXU
1 stop10h 42mWestJet
Mon 22/96:00 a.m.YXU - ORD
1 stop11h 43mWestJet
Deal found 1/8C$ 473
Mon 15/95:30 p.m.ORD - YXU
1 stop10h 42mMultiple Airlines
Mon 22/98:00 p.m.YXU - ORD
2 stops14h 51mMultiple Airlines
Deal found 1/8C$ 639
Sat 13/99:55 a.m.ORD - YXU
1 stop4h 22mAir Canada
Sat 20/910:00 a.m.YXU - ORD
1 stop6h 04mAir Canada
Deal found 30/7C$ 816
Sat 13/93:50 p.m.ORD - YXU
1 stop4h 37mUnited Airlines
Sat 20/96:10 a.m.YXU - ORD
1 stop6h 53mUnited Airlines
Deal found 30/7C$ 951
Sat 13/99:07 a.m.STL - YXU
2 stops29h 10mUnited Airlines
Sat 20/96:10 a.m.YXU - STL
2 stops15h 36mUnited Airlines
Deal found 30/7C$ 1,121
Wed 13/89:15 a.m.STL - YXU
1 stop4h 47mAir Canada
Sat 16/83:40 p.m.YXU - STL
1 stop5h 05mAir Canada
Deal found 30/7C$ 1,623

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to London that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 1 August 2025.
Use the filters below to find and compare flights from Illinois to London that are best for you.

Fly from

Illinois

Fly to

London

Route

Depart

Return

Price

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Sat 13/9

5:30 p.m.-5:12 a.m.

1 stop10h 42m

London

Sat 20/9

8:00 p.m.-5:18 p.m.

3 stops22h 18m

C$ 673

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Sat 13/9

5:30 p.m.-7:07 p.m.

1 stop24h 37m

London

Sat 20/9

6:00 a.m.-4:43 p.m.

1 stop11h 43m

C$ 688

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Sat 13/9

9:55 a.m.-3:17 p.m.

1 stop4h 22m

London

Sat 20/9

10:00 a.m.-3:04 p.m.

1 stop6h 04m

C$ 816

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Sat 13/9

3:50 p.m.-9:27 p.m.

1 stop4h 37m

London

Sat 20/9

6:10 a.m.-12:03 p.m.

1 stop6h 53m

C$ 951

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

Sat 13/9

9:07 a.m.-3:17 p.m.

2 stops29h 10m

London

Sat 20/9

6:10 a.m.-8:46 p.m.

2 stops15h 36m

C$ 1,121

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

Wed 13/8

9:15 a.m.-3:02 p.m.

1 stop4h 47m

London

Sat 16/8

3:40 p.m.-7:45 p.m.

1 stop5h 05m

C$ 1,623

Flights are sorted by cheapest round-trip flights first.

Deals found on 30/7

Best time to book a flight from Illinois to London

Have a flexible travel schedule? Discover the best time to fly to London from Illinois with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Illinois to London

What is the cheapest month to book a flight from Illinois to London, Ontario?

Currently, October is the cheapest month in which you can book a flight from Illinois to London, Ontario (average of C$ 243). Flying from Illinois to London, Ontario in December is currently the most expensive (average of C$ 478). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to London. Reviews last updated 1 August 2025.
See what other customers who have flown with United Airlines,WestJet, andAir Canada from Illinois to London have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,900 reviews
Check prices

Comfort

7.3

Overall

7.4

Boarding

7.7

Food

6.6

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
8,900 reviews
United Airlines
7.4
Good
8,900 reviews
Check prices

Comfort

7.3

Overall

7.4

Boarding

7.7

Food

6.6

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
WestJet
7.2
Good
2,978 reviews
United Airlines
7.4
Good
8,900 reviews
Check prices

Comfort

7.3

Overall

7.4

Boarding

7.7

Food

6.6

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Air Canada
7.1
Good
9,851 reviews
United Airlines
7.4
Good
8,900 reviews
Check prices

Comfort

7.3

Overall

7.4

Boarding

7.7

Food

6.6

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Related info for your journey

Find useful and relevant information for your journey from Illinois to London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to London from Illinois?

    If you book a flight to London from Illinois, you will be flying to London, which is the city’s only airport. London (YXU) is located 8.6 km from the centre of London.

  • Can I find deals for flights from Illinois to London that include hotel bookings?

    Yes. In addition to deals on Illinois to London flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to London?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to London.

  • Can I find deals for business class flights from Illinois to London?

    Yes. Cheapflights offers flight deals from Illinois to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Illinois to London, Ontario?

    Currently, October is the cheapest month in which you can book a flight from Illinois to London, Ontario (average of C$ 243). Flying from Illinois to London, Ontario in December is currently the most expensive (average of C$ 478). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Grand Bend
Port Stanley

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Illinois to London

See prices for flight routes from nearby airports that may be better suited for you.
Newark to Toronto Island flights
Newark to Pearson Intl flights
John F Kennedy Intl to Pearson Intl flights
Newark to Pierre Elliott Trudeau Intl flights
LaGuardia to Pearson Intl flights
LaGuardia to Pierre Elliott Trudeau Intl flights
Boston to Pearson Intl flights
O'Hare Intl to Pearson Intl flights
John F Kennedy Intl to Pierre Elliott Trudeau Intl flights
Los Angeles to Pearson Intl flights
Dulles Intl to Pearson Intl flights
Boston to Toronto Island flights
San Francisco to Pearson Intl flights
Reagan-National to Pearson Intl flights
Dallas/Fort Worth to Pearson Intl flights
Hobby to Pearson Intl flights
Dulles Intl to Toronto Island flights
Dulles Intl to Pierre Elliott Trudeau Intl flights
Fort Lauderdale to Pearson Intl flights
Seattle to Pearson Intl flights
Atlanta to Pearson Intl flights
Reagan-National to Pierre Elliott Trudeau Intl flights
Los Angeles to Pierre Elliott Trudeau Intl flights
George Bush Intcntl to Pearson Intl flights
San Francisco to Pierre Elliott Trudeau Intl flights
O'Hare Intl to Pierre Elliott Trudeau Intl flights
Midway to Toronto Island flights
Boston to Pierre Elliott Trudeau Intl flights
Baltimore to Pearson Intl flights
Philadelphia to Pearson Intl flights
Minneapolis to Pearson Intl flights
Orlando to Pearson Intl flights
Fort Lauderdale to Pierre Elliott Trudeau Intl flights
John F Kennedy Intl to Toronto Island flights
Raleigh to Pearson Intl flights
San Diego to Pearson Intl flights
Philadelphia to Pierre Elliott Trudeau Intl flights
Charlotte to Pearson Intl flights
Midway to Pearson Intl flights
Atlanta to Pierre Elliott Trudeau Intl flights
Baltimore to Pierre Elliott Trudeau Intl flights
Denver to Pierre Elliott Trudeau Intl flights
Orlando to Pierre Elliott Trudeau Intl flights
LaGuardia to Toronto Island flights
Miami to Pearson Intl flights
Denver to Pearson Intl flights
Dallas/Fort Worth to Pierre Elliott Trudeau Intl flights
Sky Harbor Intl to Pearson Intl flights
Nashville to Pearson Intl flights
San Jose to Pearson Intl flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Illinois to London?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to London from Illinois today with Cheapflights!

Why should you use Cheapflights to find cheap flight tickets from Illinois to London?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to London from Illinois.

Can Cheapflights find flights from Illinois to London with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Illinois to London flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Illinois to London become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to London from Illinois today and book when prices fit your budget.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.