How long is the flight from Illinois to London?

Departing from Illinois to London will take you 12h 13m. Illinois and London are separated by a distance of 4069 mi. This flight may include one or multiple stops.

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

£287 is the cheapest one-way deal found within the past few days, from Iberia. You may also be able to find cheap deals on Lufthansa and British Airways, with prices starting from £292 and £297, 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 £658, our data indicates the cheapest price to be £230. The most popular route (Chicago O'Hare Intl - London Heathrow), is priced around £435.

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 (85%), Air Canada (80%), Austrian Airlines (80%).

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.

£239+ 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 31 October 2026.

Sun 29/1118:30 -

1 stop14h 40m

Thu 3/1210:10 -

1 stop13h 10m

Deal found 25/10£529

Wed 18/1115:55 -

1 stop11h 10m

Sun 29/1107:50 -

1 stop12h 20m

Deal found 26/10£530

Wed 9/1219:00 -

2 stops22h 45m

Tue 15/1219:35 -

2 stops25h 55m

Deal found 26/10£530

Wed 9/1218:30 -

1 stop16h 55m

Wed 16/1208:25 -

1 stop14h 55m

Deal found 25/10£531

Wed 9/1218:30 -

2 stops17h 20m

Tue 15/1207:15 -

2 stops16h 05m

Deal found 26/10£531

Wed 11/1119:00 -

3 stops22h 10m

Sat 21/1120:50 -

2 stops24h 40m

Deal found 27/10£533

Wed 2/1218:30 -

2 stops18h 25m

Wed 9/1208:50 -

2 stops14h 30m

Deal found 29/10£534

Wed 2/1218:30 -

2 stops22h 50m

Tue 8/1207:15 -

2 stops16h 05m

Deal found 27/10£534

Sun 29/1118:30 -

1 stop19h 00m

Tue 8/1212:15 -

1 stop11h 05m

Deal found 28/10£534

Sun 29/1118:30 -

2 stops21h 40m

Fri 4/1206:45 -

2 stops16h 35m

Deal found 28/10£534

Tue 1/1218:30 -

1 stop15h 20m

Tue 8/1208:00 -

1 stop15h 20m

Deal found 29/10£535

Mon 7/1218:30 -

2 stops17h 20m

Wed 9/1218:50 -

2 stops28h 30m

Deal found 27/10£535

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 31 October 2026.

Fri 22/119:10 -

2 stops32h 25m

Thu 28/106:40 -

1 stop16h 05m

Deal found 26/10£562

Tue 26/117:16 -

1 stop30h 34m

Tue 2/209:35 -

1 stop36h 21m

Deal found 25/10£581

Mon 1/317:47 -

1 stop12h 13m

Wed 3/309:00 -

2 stops19h 58m

Deal found 29/10£602

Wed 24/220:15 -

1 stop31h 40m

Tue 2/317:20 -

1 stop22h 40m

Deal found 28/10£622

Wed 27/118:00 -

2 stops15h 45m

Thu 4/210:00 -

2 stops17h 52m

Deal found 28/10£667

Wed 7/419:25 -

Nonstop8h 10m

Sat 17/413:30 -

Nonstop8h 55m

Deal found 28/10£715

Mon 11/113:45 -

2 stops20h 00m

Sun 17/110:00 -

2 stops17h 52m

Deal found 27/10£741

Fri 22/114:55 -

2 stops18h 50m

Thu 28/116:00 -

1 stop29h 30m

Deal found 26/10£764

Sat 10/419:15 -

1 stop17h 15m

Sat 17/415:35 -

2 stops30h 35m

Deal found 28/10£577

Wed 9/1219:10 -

2 stops15h 50m

Wed 13/118:05 -

2 stops28h 40m

Deal found 28/10£581

Sun 31/111:45 -

1 stop16h 10m

Tue 9/217:20 -

1 stop22h 40m

Deal found 29/10£643

Mon 22/318:45 -

Nonstop8h 10m

Tue 30/306:55 -

1 stop13h 05m

Deal found 28/10£651

Wed 21/419:15 -

2 stops17h 35m

Sun 25/421:05 -

2 stops25h 05m

Deal found 30/10£581

Wed 20/115:00 -

2 stops18h 45m

Fri 19/210:00 -

2 stops17h 33m

Deal found 26/10£704

Wed 28/411:20 -

1 stop15h 45m

Tue 11/517:50 -

1 stop21h 45m

Deal found 27/10£648

Wed 28/416:25 -

Nonstop8h 20m

Mon 3/513:50 -

1 stop28h 45m

Deal found 29/10£652

Wed 17/310:56 -

2 stops16h 34m

Tue 23/313:00 -

2 stops15h 13m

Deal found 28/10£731

Wed 28/419:15 -

2 stops17h 35m

Thu 13/519:30 -

1 stop26h 40m

Deal found 29/10£589

Sun 18/420:05 -

1 stop38h 40m

Thu 6/517:50 -

1 stop21h 45m

Deal found 26/10£648

Sun 6/1207:05 -

2 stops19h 55m

Mon 14/1210:00 -

2 stops18h 57m

Deal found 25/10£727

Thu 21/114:55 -

2 stops18h 55m

Tue 26/116:35 -

1 stop28h 55m

Deal found 29/10£808

Thu 4/317:45 -

Nonstop8h 10m

Thu 11/309:00 -

1 stop13h 15m

Deal found 26/10£684

Thu 31/1218:45 -

1 stop15h 00m

Sat 9/110:00 -

1 stop12h 15m

Deal found 27/10£843

Thu 11/220:15 -

1 stop31h 40m

Mon 15/210:55 -

1 stop37h 25m

Deal found 30/10£651

Sun 21/316:00 -

1 stop15h 15m

Sat 27/314:45 -

1 stop24h 49m

Deal found 29/10£802

Tue 24/1111:00 -

2 stops40h 25m

Wed 9/1209:35 -

2 stops59h 55m

Deal found 28/10£809

Sun 21/309:42 -

1 stop15h 13m

Tue 30/307:25 -

2 stops16h 26m

Deal found 26/10£688

Wed 11/1110:30 -

2 stops23h 30m

Sun 15/1106:40 -

1 stop16h 05m

Deal found 30/10£670

Sat 30/111:45 -

1 stop16h 10m

Fri 5/217:20 -

1 stop22h 40m

Deal found 29/10£673

Fri 9/416:25 -

Nonstop8h 20m

Thu 15/406:50 -

1 stop11h 10m

Deal found 26/10£691

Find flight deals from Illinois to London

Round-trip from	£524
One-way from	£239
Popular in	June
Cheapest in	February
Average price	£680
Good round-trip deal	£704 or less
Good one-way deal	£275 or less

Icelandair
28/3-19/4
2 total stops
21h 40m total
Illinois to London

Search Deals

British Airways
26/1-31/12
Nonstop
7h 45m total
Illinois to London

Search Deals

Highest demand for flights based on searches. 21% potential increase in price (£130 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 5% potential price decrease (£26 potential savings vs. average return price).

Search Deals

Average for round-trip flights in October 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 - STN London Stansted

ORDSTN

Chicago O'Hare Intl

Sun 14/2

20:10-21:25

3 stops43h 15m

London Stansted

Wed 31/12

00:00-17:00

Nonstop0h 00m

£248

ChicagoLondon

ORD Chicago O'Hare Intl - LHR London Heathrow

ORDLHR

Chicago O'Hare Intl

Mon 15/2

12:51-10:25

2 stops15h 34m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£249

ChicagoLondon

ORD Chicago O'Hare Intl - LGW London Gatwick

ORDLGW

Chicago O'Hare Intl

Sun 8/11

20:10-20:35

2 stops18h 25m

London Gatwick

Wed 31/12

00:00-17:00

Nonstop0h 00m

£253

PeoriaLondon

PIA Greater Peoria - LHR London Heathrow

PIALHR

Greater Peoria

Wed 31/3

14:33-08:05

1 stop11h 32m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£260

ChicagoLondon

ORD Chicago O'Hare Intl - STN London Stansted

ORDSTN

Chicago O'Hare Intl

Tue 1/12

18:30-06:55

2 stops30h 25m

London Stansted

Wed 31/12

00:00-17:00

Nonstop0h 00m

£261

ChicagoLondon

ORD Chicago O'Hare Intl - STN London Stansted

ORDSTN

Chicago O'Hare Intl

Wed 24/3

22:25-21:55

2 stops42h 30m

London Stansted

Wed 31/12

00:00-17:00

Nonstop0h 00m

£263

PeoriaLondon

PIA Greater Peoria - LHR London Heathrow

PIALHR

Greater Peoria

Mon 22/3

14:33-06:55

1 stop11h 22m

London Heathrow

Wed 31/12

00:00-17:00

Nonstop0h 00m

£268

ChicagoLondon

ORD Chicago O'Hare Intl - STN London Stansted

ORDSTN

Chicago O'Hare Intl

Sat 13/2

18:30-07:45

2 stops31h 15m

London Stansted

Wed 31/12

00:00-17:00

Nonstop0h 00m

£269

ChicagoLondon

ORD Chicago O'Hare Intl - STN London Stansted

ORDSTN

Chicago O'Hare Intl

Fri 13/11

20:10-20:30

1 stop18h 20m

London Stansted

Wed 31/12

00:00-17:00

Nonstop0h 00m

£272

ChicagoLondon

ORD Chicago O'Hare Intl - STN London Stansted

ORDSTN

Chicago O'Hare Intl

Mon 14/12

18:30-18:00

2 stops17h 30m

London Stansted

Wed 31/12

00:00-17:00

Nonstop0h 00m

£276

Flights are sorted by cheapest return flights first.

Deals found on 28/10

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.

ORD-LGW

ORD-LHR

ORD-STN

PIA-LHR

DEC-LHR

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

ORD-LGW

ORD-LHR

ORD-STN

PIA-LHR

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 £467). Flying from Illinois to London in June is currently the most expensive (average of £1,036). 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.

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 £478 and £791 in March.
The cheapest return price found within the last 5 days was £524 on Icelandair (28 Mar–19 Apr).

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

Booking 28 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 12h 13m. Illinois and London are separated by a distance of 4069 mi. This flight may include one or multiple stops.
What are the cheapest airlines to fly from Illinois to London one-way?
£287 is the cheapest one-way deal found within the past few days, from Iberia. You may also be able to find cheap deals on Lufthansa and British Airways, with prices starting from £292 and £297, 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 (85%), Air Canada (80%), Austrian Airlines (80%).
What are the cheapest flights from Illinois to London?
Looking for the cheapest flight from Illinois to London? While on average our users pay £658, our data indicates the cheapest price to be £230. The most popular route (Chicago O'Hare Intl - London Heathrow), is priced around £435.
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 £467). Flying from Illinois to London in June is currently the most expensive (average of £1,036). 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£737	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£915	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Iberia	Cheapest£520	Average£704	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 £239

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 26/1. 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 31 October 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 31 October 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 31 October 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 31 October 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 31 October 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 31 October 2026.

Last-minute flights from Illinois to LondonDiscover last-minute flight deals from Illinois to London. Data last updated 31 October 2026 and is based on user searches.

Discover last-minute flight deals from Illinois to London. Data last updated 31 October 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 31 October 2026.

Search for one-way flight options from Illinois to London. Find affordable one-way fares based on user searches. Data last updated 31 October 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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Good one-way deal

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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 31 October 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.

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 £478 and £791 in March.The cheapest return price found within the last 5 days was £524 on Icelandair (28 Mar–19 Apr).

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

Booking 28 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

Explore flights to London departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 31 October 2026.

Illinois and London flights

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

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

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 31 October 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 31 October 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 31 October 2026.

Last-minute flights from Illinois to London
Discover last-minute flight deals from Illinois to London. Data last updated 31 October 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 31 October 2026.

Illinois to London flights typically cost between £478 and £791 in March.
The cheapest return price found within the last 5 days was £524 on Icelandair (28 Mar–19 Apr).