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Cheap flights from Illinois to London, ON from C$ 315

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 22/10. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — YXU
13 Nov — 20 Nov1
1 adult
1 adult, Economy

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 14 October 2025.

Round-trip from

C$ 678

One-way from

C$ 315
WestJet
  • WestJet
  • 27/11-4/12
  • 3 total stops
  • 41h 52m total
  • Illinois to London
Search Deals
22/10
  • 22/10
  • 2 total stops
  • 37h 00m total
  • Illinois to London
Search Deals

Find 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 14 October 2025.

Tue 21/1011:00 a.m.ORD - YXU
2 stops17h 12mMultiple Airlines
Sat 25/106:00 a.m.YXU - ORD
1 stop11h 43mMultiple Airlines
Deal found 12/10C$ 628
Thu 27/116:45 p.m.ORD - YXU
2 stops23h 27mMultiple Airlines
Thu 4/128:10 p.m.YXU - ORD
1 stop18h 25mMultiple Airlines
Deal found 12/10C$ 678
Thu 27/113:55 p.m.ORD - YXU
1 stop4h 26mAir Canada
Thu 4/129:25 a.m.YXU - ORD
1 stop4h 36mAir Canada
Deal found 12/10C$ 874
Fri 28/113:55 p.m.ORD - YXU
1 stop4h 26mUnited Airlines
Fri 5/125:40 p.m.YXU - ORD
1 stop5h 25mUnited Airlines
Deal found 14/10C$ 979
Fri 28/116:43 p.m.STL - YXU
2 stops21h 22mUnited Airlines
Fri 5/129:25 a.m.YXU - STL
2 stops32h 04mUnited Airlines
Deal found 13/10C$ 1,327
Fri 28/114:05 p.m.STL - YXU
1 stop4h 16mAir Canada
Fri 5/129:25 a.m.YXU - STL
1 stop7h 04mAir Canada
Deal found 13/10C$ 1,388

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 14 October 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

Thu 27/11

6:45 p.m.-7:12 p.m.

2 stops23h 27m

London

Thu 4/12

8:10 p.m.-1:35 p.m.

1 stop18h 25m

C$ 678

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Thu 27/11

3:55 p.m.-9:21 p.m.

1 stop4h 26m

London

Thu 4/12

9:25 a.m.-1:01 p.m.

1 stop4h 36m

C$ 874

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Fri 28/11

3:55 p.m.-9:21 p.m.

1 stop4h 26m

London

Fri 5/12

5:40 p.m.-10:05 p.m.

1 stop5h 25m

C$ 979

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

Tue 3/3

8:21 a.m.-9:21 p.m.

2 stops12h 00m

London

Wed 4/3

9:25 a.m.-9:00 p.m.

2 stops12h 35m

C$ 1,295

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

Fri 28/11

6:43 p.m.-5:05 p.m.

2 stops21h 22m

London

Fri 5/12

9:25 a.m.-4:29 p.m.

2 stops32h 04m

C$ 1,327

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

Tue 3/3

4:05 p.m.-9:21 p.m.

1 stop4h 16m

London

Wed 4/3

9:25 a.m.-3:29 p.m.

1 stop7h 04m

C$ 1,339

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

Fri 28/11

8:00 a.m.-5:05 p.m.

2 stops8h 05m

London

Fri 5/12

9:25 a.m.-3:29 p.m.

1 stop7h 04m

C$ 1,402

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Wed 22/10

3:12 p.m.-5:12 a.m.

2 stops37h 00m

C$ 315

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Fri 14/11

2:00 p.m.-9:21 p.m.

1 stop6h 21m

C$ 409

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Fri 14/11

6:20 p.m.-5:05 p.m.

2 stops21h 45m

C$ 509

Flights are sorted by cheapest round-trip flights first.

Deals found on 13/10

Showing 1-10 of 12 results
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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, March is the cheapest month in which you can book a flight from Illinois to London, Ontario (average of C$ 149). Flying from Illinois to London, Ontario in July is currently the most expensive (average of C$ 263). 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 Air Canada and United Airlines fly from Illinois to London, Ontario in about 4h 26m. The time it takes to get you to your destination can typically vary by up to 7h 34m. 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, March is the cheapest month in which you can book a flight from Illinois to London, Ontario (average of C$ 149). Flying from Illinois to London, Ontario in July is currently the most expensive (average of C$ 263). 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

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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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