How long is the flight from Illinois to London?

Departing from Illinois to London will take you 11h 51m. Illinois and London are separated by a distance of 3942 mi. This flight may include one or multiple stops.

What are the cheapest airlines to fly from Illinois to London one-way?

£282 is the cheapest one-way deal found within the past few days, from Lufthansa. You may also be able to find cheap deals on Iberia and British Airways, with prices starting from £287 and £293, respectively.

In terms of precipitation, rainfall in London ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London when rainfall is around 40.0 mm.

If weather is an important factor for your trip to London, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

What are the most popular routes from Illinois to London?

When deciding which route to take from Illinois to London consider Chicago O'Hare Intl - London Heathrow, Chicago O'Hare Intl - London Gatwick or Chicago O'Hare Intl - London Stansted as they are the most popular.

What are the cheapest flights from Illinois to London?

Looking for the cheapest flight from Illinois to London? While on average our users pay £675, our data indicates the cheapest price to be £230. The most popular route (Chicago O'Hare Intl - London Heathrow), is priced around £254.

What are the most reliable airlines from Illinois to London?

Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Illinois to London on time: Royal Jordanian (73%), Malaysia Airlines (68%), Air Canada (66%).

What are the most popular airlines that fly from Illinois to London?

Before booking your flight from Illinois to London check out the most popular airlines for this route: British Airways, Aer Lingus or United Airlines.

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 holiday 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.

£198+ Cheap Flights from Illinois to London

Cheap flight deals from Illinois to London

Enter your travel dates to find the best prices.

Cheapest

Best

Direct

Last-minute

One-way

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 21 September 2026.

Wed 2/1212:02 -

2 stops36h 48m

Tue 8/1209:35 -

1 stop20h 37m

Deal found 20/9£479

Sat 5/1218:05 -

1 stop32h 10m

Tue 8/1209:35 -

1 stop21h 06m

Deal found 21/9£504

Wed 14/1011:35 -

3 stops27h 45m

Wed 21/1006:30 -

2 stops13h 30m

Deal found 16/9£510

Tue 1/1218:13 -

1 stop30h 42m

Tue 8/1209:35 -

2 stops31h 42m

Deal found 20/9£513

Wed 2/1212:02 -

2 stops36h 48m

Wed 9/1209:45 -

1 stop20h 27m

Deal found 20/9£515

Wed 14/1012:10 -

1 stop12h 20m

Wed 21/1008:40 -

2 stops16h 01m

Deal found 16/9£535

Sun 4/1017:10 -

1 stop11h 40m

Tue 13/1009:45 -

1 stop20h 34m

Deal found 16/9£542

Sun 4/1008:55 -

2 stops22h 00m

Tue 13/1006:30 -

2 stops19h 50m

Deal found 20/9£542

Mon 30/1118:35 -

2 stops30h 15m

Tue 8/1209:35 -

1 stop20h 37m

Deal found 20/9£546

Wed 7/1014:20 -

1 stop20h 05m

Sun 11/1006:00 -

1 stop15h 55m

Deal found 19/9£548

Sun 27/913:00 -

1 stop18h 15m

Tue 6/1008:55 -

2 stops19h 38m

Deal found 18/9£548

Tue 17/1118:50 -

1 stop17h 00m

Tue 24/1108:40 -

1 stop13h 35m

Deal found 20/9£548

Best flights from Illinois to London
Discover carefully curated flight deals from Illinois to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 21 September 2026.

Sun 27/913:19 -

1 stop11h 51m

Tue 6/1008:55 -

2 stops19h 38m

Deal found 16/9£549

Fri 9/1021:00 -

1 stop14h 25m

Fri 16/1006:20 -

1 stop13h 40m

Deal found 20/9£554

Sun 27/913:19 -

1 stop11h 51m

Tue 6/1009:20 -

1 stop12h 54m

Deal found 20/9£555

Wed 30/915:45 -

1 stop14h 05m

Sat 10/1009:05 -

1 stop34h 15m

Deal found 16/9£578

Tue 17/1120:15 -

1 stop31h 40m

Tue 1/1217:20 -

1 stop22h 40m

Deal found 18/9£623

Fri 9/1019:15 -

2 stops31h 40m

Sat 14/1117:00 -

1 stop29h 45m

Deal found 18/9£643

Fri 2/1012:35 -

1 stop11h 50m

Thu 8/1015:15 -

1 stop13h 18m

Deal found 19/9£714

Wed 4/1120:05 -

1 stop10h 35m

Wed 11/1107:40 -

1 stop13h 15m

Deal found 18/9£720

Mon 19/1020:50 -

Nonstop8h 00m

Mon 30/1112:35 -

Nonstop8h 55m

Deal found 20/9£729

Tue 8/1214:30 -

2 stops42h 35m

Fri 11/1210:45 -

2 stops58h 45m

Deal found 16/9£821

Wed 4/1121:35 -

2 stops14h 55m

Wed 11/1109:15 -

2 stops15h 00m

Deal found 20/9£884

Wed 4/1111:39 -

2 stops22h 06m

Wed 11/1110:00 -

2 stops18h 54m

Deal found 20/9£564

Wed 11/1118:25 -

1 stop15h 20m

Wed 2/1210:00 -

1 stop12h 15m

Deal found 19/9£576

Thu 5/1118:30 -

2 stops15h 45m

Sun 8/1108:40 -

1 stop15h 40m

Deal found 16/9£577

Wed 2/1210:50 -

1 stop13h 05m

Fri 11/1218:00 -

1 stop27h 26m

Deal found 17/9£582

Wed 2/1212:36 -

1 stop13h 14m

Fri 11/1206:30 -

2 stops15h 54m

Deal found 18/9£578

Fri 6/1118:30 -

2 stops21h 10m

Fri 13/1112:45 -

1 stop11h 35m

Deal found 16/9£579

Tue 13/1011:25 -

1 stop23h 25m

Wed 21/1017:45 -

1 stop21h 55m

Deal found 20/9£644

Wed 18/1113:31 -

1 stop12h 14m

Sun 22/1108:55 -

2 stops19h 59m

Deal found 17/9£587

Wed 7/1012:10 -

1 stop12h 20m

Mon 12/1009:30 -

1 stop33h 55m

Deal found 19/9£595

Mon 5/1019:15 -

2 stops15h 45m

Tue 2/206:40 -

2 stops20h 53m

Deal found 18/9£657

Tue 13/1011:25 -

1 stop16h 30m

Thu 22/1017:35 -

1 stop22h 05m

Deal found 20/9£644

Sun 4/1010:05 -

2 stops14h 15m

Tue 13/1008:20 -

2 stops15h 55m

Deal found 20/9£586

Fri 6/1112:27 -

1 stop12h 38m

Fri 13/1108:55 -

2 stops19h 59m

Deal found 16/9£587

Sun 27/915:45 -

2 stops14h 40m

Tue 6/1017:45 -

2 stops24h 50m

Deal found 16/9£595

Sat 31/1016:05 -

2 stops23h 55m

Sat 14/1106:50 -

2 stops14h 53m

Deal found 17/9£607

Wed 11/1113:35 -

1 stop13h 50m

Mon 16/1108:40 -

2 stops16h 04m

Deal found 17/9£588

Wed 2/1209:37 -

2 stops15h 13m

Sun 6/1206:30 -

2 stops17h 31m

Deal found 17/9£590

Tue 1/1220:15 -

1 stop31h 40m

Mon 7/1210:55 -

1 stop37h 25m

Deal found 20/9£652

Fri 9/1014:20 -

2 stops28h 10m

Sun 11/1009:00 -

2 stops33h 35m

Deal found 20/9£599

Find flight deals from Illinois to London

Round-trip from	£479
One-way from	£198
Popular in	June
Cheapest in	February
Average price	£676
Good round-trip deal	£775 or less
Good one-way deal	£287 or less

2/12-8/12
3 total stops
57h 25m total
Illinois to London

Search Deals

5/12-31/12
1 total stop
32h 02m total
Illinois to London

Search Deals

Highest demand for flights based on searches. 22% potential increase in price (£137 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 5% potential price decrease (£27 potential savings vs. average return price).

Search Deals

Average for round-trip flights in September 2026

Search Deals

Price to beat on a round-trip flight from Illinois to London (LON).

Search Deals

Price to beat on a one-way flight from Illinois to London (LON).

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

ChicagoLondon

ORD Chicago O'Hare Intl - LTN London Luton

ORDLTN

Chicago O'Hare Intl

Fri 6/11

18:30-21:05

2 stops20h 35m

London Luton

Wed 31/12

00:00-17:00

Nonstop0h 00m

£223

ChicagoLondon

ORD Chicago O'Hare Intl - LTN London Luton

ORDLTN

Chicago O'Hare Intl

Thu 12/11

18:30-22:00

2 stops21h 30m

London Luton

Wed 31/12

00:00-17:00

Nonstop0h 00m

£228

ChicagoLondon

ORD Chicago O'Hare Intl - LTN London Luton

ORDLTN

Chicago O'Hare Intl

Mon 9/11

18:30-12:05

2 stops35h 35m

London Luton

Wed 31/12

00:00-17:00

Nonstop0h 00m

£234

ChicagoLondon

ORD Chicago O'Hare Intl - LTN London Luton

ORDLTN

Chicago O'Hare Intl

Tue 13/10

14:15-15:30

2 stops19h 15m

London Luton

Wed 31/12

00:00-17:00

Nonstop0h 00m

£236

ChicagoLondon

ORD Chicago O'Hare Intl - LTN London Luton

ORDLTN

Chicago O'Hare Intl

Wed 2/12

18:30-17:35

2 stops17h 05m

London Luton

Wed 31/12

00:00-17:00

Nonstop0h 00m

£236

St. LouisLondon

STL Lambert-St Louis - STN London Stansted

STLSTN

Lambert-St Louis

Mon 19/10

18:35-23:20

3 stops46h 45m

London Stansted

Wed 31/12

00:00-17:00

Nonstop0h 00m

£247

ChicagoLondon

MDW Chicago Midway - LGW London Gatwick

MDWLGW

Chicago Midway

Tue 2/3

12:30-09:00

2 stops14h 30m

London Gatwick

Wed 31/12

00:00-17:00

Nonstop0h 00m

£249

ChicagoLondon

MDW Chicago Midway - LGW London Gatwick

MDWLGW

Chicago Midway

Mon 1/3

12:30-09:00

2 stops14h 30m

London Gatwick

Wed 31/12

00:00-17:00

Nonstop0h 00m

£249

ChicagoLondon

ORD Chicago O'Hare Intl - LTN London Luton

ORDLTN

Chicago O'Hare Intl

Sat 12/12

18:30-18:30

2 stops18h 00m

London Luton

Wed 31/12

00:00-17:00

Nonstop0h 00m

£249

ChicagoLondon

MDW Chicago Midway - LGW London Gatwick

MDWLGW

Chicago Midway

Mon 11/1

20:47-06:50

1 stop28h 03m

London Gatwick

Wed 31/12

00:00-17:00

Nonstop0h 00m

£258

Flights are sorted by cheapest return flights first.

Deals found on 20/9

Showing 1-10 of 60 resultsSorted by cheapest first

...

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.

MDW-LHR

ORD-LTN

ORD-LHR

ORD-STN

ORD-LCY

Estimated return 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

USIL-LON

MDW-LHR

ORD-LTN

ORD-LHR

ORD-STN

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

Currently, January is the cheapest month in which you can book a flight from Illinois to London (average of £490). Flying from Illinois to London in June is currently the most expensive (average of £1,032). 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.

What is the cheapest time of day to fly from IL to LON?

When flying from Illinois to London, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Illinois to London

The most flights from USIL to LON are scheduled on a Monday (54 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (45 on average).

How much does it cost for a return flight from Illinois to London?

Airfare is typical for this route at the moment.

Illinois to London flights typically cost between £532 and £762 in October.
The cheapest return price found within the last 5 days was £548 on SWISS (7 Oct–11 Oct).

How far ahead should I book a flight from Illinois to London?

Booking 65 days in advance of your planned departure date is, on average, the best time to get cheap flights from Illinois to London. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

Related info for your journey

How long is the flight from Illinois to London?
Departing from Illinois to London will take you 11h 51m. Illinois and London are separated by a distance of 3942 mi. This flight may include one or multiple stops.
What are the cheapest airlines to fly from Illinois to London one-way?
£282 is the cheapest one-way deal found within the past few days, from Lufthansa. You may also be able to find cheap deals on Iberia and British Airways, with prices starting from £287 and £293, respectively.
What are the most popular routes from Illinois to London?
When deciding which route to take from Illinois to London consider Chicago O'Hare Intl - London Heathrow, Chicago O'Hare Intl - London Gatwick or Chicago O'Hare Intl - London Stansted as they are the most popular.
What are the most reliable airlines from Illinois to London?
Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Illinois to London on time: Royal Jordanian (73%), Malaysia Airlines (68%), Air Canada (66%).
What are the cheapest flights from Illinois to London?
Looking for the cheapest flight from Illinois to London? While on average our users pay £675, our data indicates the cheapest price to be £230. The most popular route (Chicago O'Hare Intl - London Heathrow), is priced around £254.
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 holiday 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?
Currently, January is the cheapest month in which you can book a flight from Illinois to London (average of £490). Flying from Illinois to London in June is currently the most expensive (average of £1,032). 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.

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Top 7 airlines flying from Illinois to London

Airline	Cheapest	Average	Flexibility	On-time
Icelandair	Cheapest£365	Average£563	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
British Airways	Cheapest£454	Average£693	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Aer Lingus	Cheapest£460	Average£809	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
American Airlines	Cheapest£490	Average£855	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights
United Airlines	Cheapest£509	Average£870	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Iberia	Cheapest£520	Average£698	FlexibilityNo cancel fee	On-time77%	Search Iberia flights
JetBlue	Cheapest£742	Average£884	FlexibilityNo cancel fee	On-time62%	Search JetBlue flights

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

Cheapflights helps you search for flights from Illinois to London via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Illinois to London for you. Better yet — we are completely free to use.

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

Certainly. Search results for flights to London from Illinois shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

Yes, Cheapflights offers price alerts on Illinois to London flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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Cheap flights from Illinois to London from £198

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/12. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Illinois to London

Cheapest flights from Illinois to LondonExplore 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 21 September 2026.

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 21 September 2026.

Best flights from Illinois to LondonDiscover carefully curated flight deals from Illinois to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 21 September 2026.

Discover carefully curated flight deals from Illinois to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 21 September 2026.

Direct flights from Illinois to LondonExplore direct flight options from Illinois to London based on user searches, and compare prices and availability for your desired travel dates. Data last updated 21 September 2026.

Explore direct flight options from Illinois to London based on user searches, and compare prices and availability for your desired travel dates. Data last updated 21 September 2026.

Last-minute flights from Illinois to LondonDiscover last-minute flight deals from Illinois to London. Data last updated 21 September 2026 and is based on user searches.

Discover last-minute flight deals from Illinois to London. Data last updated 21 September 2026 and is based on user searches.

One-way flights from Illinois to LondonSearch for one-way flight options from Illinois to London. Find affordable one-way fares based on user searches. Data last updated 21 September 2026.

Search for one-way flight options from Illinois to London. Find affordable one-way fares based on user searches. Data last updated 21 September 2026.

Find flight deals from Illinois to London

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One-way from

Popular in

Cheapest in

Average price

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

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.

Cheapflights Insights

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

What is the cheapest time of day to fly from IL to LON?

Find hourly flight availability from Illinois to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 21 September 2026.

When flying from Illinois to London, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Illinois to London

Explore weekly flight availability from Illinois to London. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 21 September 2026.

The most flights from USIL to LON are scheduled on a Monday (54 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (45 on average).

How much does it cost for a return flight from Illinois to London?

Airfare is typical for this route at the moment.

Illinois to London flights typically cost between £532 and £762 in October.The cheapest return price found within the last 5 days was £548 on SWISS (7 Oct–11 Oct).

How far ahead should I book a flight from Illinois to London?

Booking 65 days in advance of your planned departure date is, on average, the best time to get cheap flights from Illinois to London. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

Related info for your journey

How long is the flight from Illinois to London?

What are the cheapest airlines to fly from Illinois to London one-way?

What are the most popular routes from Illinois to London?

What are the most reliable airlines from Illinois to London?

What are the cheapest flights from Illinois to London?

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

How can I find direct flights from Illinois to London?

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

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

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Alternative routes for Illinois to London

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to London by adding a car hire and/or hotel booking to your travel itinerary.

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Search flights from Illinois to London by cabin class

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Other flights to London

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Illinois and London flights

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

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

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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 21 September 2026.

Best flights from Illinois to London
Discover carefully curated flight deals from Illinois to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 21 September 2026.

Direct flights from Illinois to London
Explore direct flight options from Illinois to London based on user searches, and compare prices and availability for your desired travel dates. Data last updated 21 September 2026.

Last-minute flights from Illinois to London
Discover last-minute flight deals from Illinois to London. Data last updated 21 September 2026 and is based on user searches.

One-way flights from Illinois to London
Search for one-way flight options from Illinois to London. Find affordable one-way fares based on user searches. Data last updated 21 September 2026.

Illinois to London flights typically cost between £532 and £762 in October.
The cheapest return price found within the last 5 days was £548 on SWISS (7 Oct–11 Oct).