How does KAYAK find such low prices on flights from Illinois to London?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to London.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to London?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London from Illinois is likely to change within 7 days, so travelers know whether to wait or book now.

What is the Hacker Fare option on flights from Illinois to London?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to London with an airline and back to Illinois with another airline.

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to London?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

$250 CHEAP FLIGHTS from Illinois to London

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Flight Deals

Cheap Flights from Illinois to London

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Recent round-trip flight deals from Illinois to London

Thu, Oct 8 - Mon, Oct 12

5:30 pm - 4:45 pmORD Chicago O'Hare Intl-YXU London

22h 15m1 stop Calgary

6:10 am - 4:40 pmYXU London-ORD Chicago O'Hare Intl

11h 30m1 stop Calgary

$516WestJet

Thu, Oct 8 - Mon, Oct 12

5:30 pm - 5:20 amORD Chicago O'Hare Intl-YXU London

10h 50m1 stop Calgary

6:10 am - 12:59 amYXU London-ORD Chicago O'Hare Intl

19h 49m2 stops Calgary Phoenix Sky Harbor Intl

$579Multiple Airlines

Mon, Nov 30 - Sat, Dec 5

12:50 pm - 5:35 amORD Chicago O'Hare Intl-YXU London

15h 45m2 stops Toronto Pearson Intl Calgary

5:30 am - 2:52 pmYXU London-ORD Chicago O'Hare Intl

10h 22m2 stops Toronto Pearson Intl Montreal Pierre Elliott Trudeau Intl

$588Multiple Airlines

Mon, Nov 30 - Sat, Dec 5

8:45 am - 5:35 amORD Chicago O'Hare Intl-YXU London

19h 50m2 stops Toronto Pearson Intl Calgary

3:20 pm - 7:58 pmYXU London-ORD Chicago O'Hare Intl

5h 38m1 stop Toronto Pearson Intl

$590Multiple Airlines

Mon, Nov 30 - Sat, Dec 5

7:05 am - 5:35 amORD Chicago O'Hare Intl-YXU London

21h 30m3 stops Montreal Pierre Elliott Trudeau Intl Toronto Pearson Intl Calgary

5:30 am - 2:52 pmYXU London-ORD Chicago O'Hare Intl

10h 22m2 stops Toronto Pearson Intl Montreal Pierre Elliott Trudeau Intl

$597Multiple Airlines

Sun, Oct 18 - Sun, Oct 25

5:30 pm - 5:20 amORD Chicago O'Hare Intl-YXU London

10h 50m1 stop Calgary

6:10 am - 6:31 pmYXU London-ORD Chicago O'Hare Intl

37h 21m2 stops Calgary Atlanta Hartsfield-Jackson

$609Multiple Airlines

Mon, Nov 30 - Sat, Dec 5

4:30 pm - 9:52 pmORD Chicago O'Hare Intl-YXU London

4h 22m1 stop Toronto Pearson Intl

9:15 am - 1:13 pmYXU London-ORD Chicago O'Hare Intl

4h 58m1 stop Toronto Pearson Intl

$640Air Canada

Sat, Sep 26 - Mon, Sep 28

2:15 pm - 9:40 pmORD Chicago O'Hare Intl-YXU London

6h 25m1 stop Toronto Pearson Intl

5:40 am - 9:00 amYXU London-ORD Chicago O'Hare Intl

4h 20m1 stop Toronto Pearson Intl

$656Air Canada

Sat, Sep 26 - Mon, Sep 28

8:45 am - 5:43 pmORD Chicago O'Hare Intl-YXU London

7h 58m2 stops Montreal Pierre Elliott Trudeau Intl Toronto Pearson Intl

5:40 am - 9:00 amYXU London-ORD Chicago O'Hare Intl

4h 20m1 stop Toronto Pearson Intl

$665Air Canada

Sat, Oct 17 - Sat, Oct 24

10:43 am - 5:43 pmORD Chicago O'Hare Intl-YXU London

6h 00m1 stop Toronto Pearson Intl

9:05 am - 1:23 pmYXU London-ORD Chicago O'Hare Intl

5h 18m1 stop Toronto Pearson Intl

$667Multiple Airlines

Useful Info

Cheapest flight	$250

Flight from Chicago to London

How does KAYAK find such low prices on flights from Illinois to London?
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to London.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to London?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London from Illinois is likely to change within 7 days, so travelers know whether to wait or book now.
What is the Hacker Fare option on flights from Illinois to London?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to London with an airline and back to Illinois with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to London?
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.