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Cheap flights from Illinois to London, ON from C$ 339

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 17/4. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — YXU
7 Apr — 14 Apr1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Illinois to London

Enter your travel dates to find the best prices.

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 8 March 2026.

Mon 25/55:30 p.m.
ORD
-
YXU
1 stop10h 50m
WestJet
Thu 28/56:10 a.m.
YXU
-
ORD
1 stop11h 30m
WestJet
Deal found 4/3C$ 415
Sat 23/55:30 p.m.
ORD
-
YXU
1 stop10h 50m
WestJet
Tue 26/56:10 a.m.
YXU
-
ORD
1 stop11h 30m
WestJet
Deal found 5/3C$ 589
Sat 2/57:21 p.m.
ORD
-
YXU
2 stops32h 59m
Multiple Airlines
Sun 10/56:10 a.m.
YXU
-
ORD
1 stop11h 30m
Multiple Airlines
Deal found 5/3C$ 609
Sat 18/42:00 p.m.
ORD
-
YXU
1 stop6h 19m
Air Canada
Sat 25/45:10 a.m.
YXU
-
ORD
2 stops10h 45m
Air Canada
Deal found 4/3C$ 629
Sat 18/44:05 p.m.
STL
-
YXU
1 stop4h 14m
Air Canada
Sat 25/49:25 a.m.
YXU
-
STL
1 stop7h 00m
Air Canada
Deal found 4/3C$ 823
Wed 29/44:05 p.m.
STL
-
YXU
1 stop4h 14m
Air Canada
Sat 2/512:20 p.m.
YXU
-
STL
2 stops9h 05m
Air Canada
Deal found 3/3C$ 836
Sun 19/44:05 p.m.
STL
-
YXU
1 stop4h 14m
United Airlines
Sun 26/45:10 a.m.
YXU
-
STL
2 stops17h 42m
United Airlines
Deal found 4/3C$ 981

Find flight deals from Illinois to London

Keep the following information in mind while searching for Illinois to London flight deals. Data was last updated 8 March 2026.

Round-trip from

C$ 415

One-way from

C$ 339
WestJet
  • WestJet
  • 25/5-28/5
  • 2 total stops
  • 22h 20m total
  • Illinois to London
Search Deals
Air Canada
  • Air Canada
  • 18/3
  • 1 total stop
  • 6h 05m total
  • Illinois to London
Search Deals

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 8 March 2026.
Use the filters below to find and compare flights from Illinois to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Mon 25/5

5:30 p.m.-5:20 a.m.

1 stop10h 50m

London

Thu 28/5

6:10 a.m.-4:40 p.m.

1 stop11h 30m

C$ 538

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Sat 23/5

5:30 p.m.-5:20 a.m.

1 stop10h 50m

London

Tue 26/5

6:10 a.m.-4:40 p.m.

1 stop11h 30m

C$ 589

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Mon 25/5

3:50 p.m.-9:38 p.m.

1 stop4h 48m

London

Thu 28/5

12:20 p.m.-8:08 p.m.

2 stops8h 48m

C$ 757

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Wed 8/4

9:50 a.m.-5:04 p.m.

1 stop6h 14m

London

Sun 12/4

9:25 a.m.-1:05 p.m.

1 stop4h 40m

C$ 810
Quickest round-trip

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Wed 29/4

4:15 p.m.-9:19 p.m.

1 stop4h 04m

London

Sat 2/5

5:40 a.m.-9:05 a.m.

1 stop4h 25m

C$ 810

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

Sat 18/4

4:05 p.m.-9:19 p.m.

1 stop4h 14m

London

Sat 25/4

9:25 a.m.-3:25 p.m.

1 stop7h 00m

C$ 823

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

Wed 29/4

4:05 p.m.-9:19 p.m.

1 stop4h 14m

London

Sat 2/5

12:20 p.m.-8:25 p.m.

2 stops9h 05m

C$ 836

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Sat 23/5

8:45 a.m.-5:33 p.m.

2 stops7h 48m

London

Tue 26/5

12:20 p.m.-8:08 p.m.

2 stops8h 48m

C$ 845

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Sun 19/4

4:15 p.m.-9:19 p.m.

1 stop4h 04m

London

Sun 26/4

5:40 p.m.-10:03 p.m.

1 stop5h 23m

C$ 848
Cheapest one-way

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Fri 17/4

9:50 a.m.-5:04 p.m.

1 stop6h 14m

C$ 339

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/3

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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$ 115). Flying from Illinois to London, Ontario in March is currently the most expensive (average of C$ 296). 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.

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.

  • How long is the flight from Illinois to London, Ontario?

    Airlines like WestJet and Air Canada fly from Illinois to London, Ontario in about 4h 48m. The time it takes to get you to your destination can typically vary by up to 6h 02m. Airlines will cover a distance of 565 km. This flight may include one or multiple stops.

  • 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$ 115). Flying from Illinois to London, Ontario in March is currently the most expensive (average of C$ 296). 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
Port Stanley
Grand Bend

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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.

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