£346+ Cheap flights to Illinois

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 10/5. Fares are subject to change and may not be available on all flights or dates of travel.
— ORD
10 Mar — 17 Mar1
1 adult
1 adult, Economy, 0 bags

Flights to Illinois in 2026

Enter your travel dates to find the best prices.

Cheapest flights to Illinois
Explore the most affordable flight options available to Illinois. Find the lowest fares based on data from user searches, with prices last updated on 8 February 2026.

Thu 26/218:30
LHR
-
ORD
1 stop26h 55m
TAP AIR PORTUGAL
Sun 1/320:25
ORD
-
LHR
1 stop19h 10m
TAP AIR PORTUGAL
Deal found 5/2£391
Fri 17/415:40
LGW
-
ORD
1 stop11h 45m
Icelandair
Wed 22/419:25
ORD
-
LGW
1 stop13h 15m
Icelandair
Deal found 4/2£391
Mon 13/415:40
LGW
-
ORD
1 stop32h 35m
Icelandair
Mon 20/419:25
ORD
-
LGW
1 stop13h 15m
Icelandair
Deal found 5/2£392
Thu 19/212:15
LHR
-
ORD
1 stop11h 05m
Icelandair
Tue 24/218:30
ORD
-
LHR
1 stop19h 00m
Icelandair
Deal found 6/2£392
Sun 1/311:55
LGW
-
ORD
1 stop11h 25m
Icelandair
Tue 10/319:30
ORD
-
LGW
1 stop10h 25m
Icelandair
Deal found 3/2£393
Fri 6/306:40
LHR
-
ORD
1 stop16h 15m
Scandinavian Airlines
Wed 11/320:20
ORD
-
LHR
1 stop16h 20m
Scandinavian Airlines
Deal found 6/2£393
Sat 7/216:35
LGW
-
ORD
1 stop28h 10m
TAP AIR PORTUGAL
Wed 18/219:10
ORD
-
LGW
1 stop13h 55m
TAP AIR PORTUGAL
Deal found 4/2£394
Wed 18/220:35
LHR
-
ORD
1 stop26h 45m
Icelandair
Tue 24/218:30
ORD
-
LHR
1 stop10h 20m
Icelandair
Deal found 6/2£394
Thu 26/206:40
LHR
-
ORD
1 stop16h 05m
Scandinavian Airlines
Mon 2/319:20
ORD
-
LHR
1 stop14h 40m
Scandinavian Airlines
Deal found 5/2£394
Thu 19/211:55
LGW
-
ORD
1 stop11h 25m
Icelandair
Mon 23/218:30
ORD
-
LGW
1 stop10h 25m
Icelandair
Deal found 5/2£395
Wed 18/220:35
LHR
-
ORD
1 stop26h 45m
Icelandair
Tue 10/319:30
ORD
-
LHR
1 stop19h 00m
Icelandair
Deal found 6/2£395
Mon 9/314:00
LGW
-
MDW
1 stop33h 13m
Multiple Airlines
Mon 23/321:51
MDW
-
LGW
1 stop31h 09m
Multiple Airlines
Deal found 6/2£396

Find flights to Illinois

Browse one-way and return flights deals to Illinois on Cheapflights. Flight deals are based on user searches and were last updated on 8 February 2026
Explore Illinois

Find flight deals to Illinois

Find the latest flights to Illinois in 2026, with up-to-date prices and availability. In the last 7 days, Cheapflights users made a total of 858,174 searches and data was last updated on 8 February 2026.

Return from

£391

One-way from

£330

Popular in

July

Cheapest in

February

Average price

£424

Good round-trip deal

£489 or less

Good one-way deal

£418 or less
TAP AIR PORTUGAL
  • TAP AIR PORTUGAL
  • 26/2-1/3
  • 2 total stops
  • 46h 05m total
  • London to Chicago
18/5
  • 18/5
  • 1 total stop
  • 15h 19m total
  • London to Illinois
Highest demand for flights based on searches. 14% potential increase in price (£86 potential increase over avg. return price).
Cheapest flight prices on average. 2% potential price decrease (£13 potential savings vs. average return price).
Average for return flights in February 2026
Price to beat on a round-trip flight from London to Illinois.
Price to beat on a one-way flight from London to Illinois.

Cheapflights Fare Finder

 
Locate flights to Illinois that fit your budget, with regularly updated fares and availability. In the last 7 days, Cheapflights users made a total of 858,174 searches and data was last updated on 8 February 2026.
Use the filters below to find and compare flights to Illinois that are best for you.

Fly from

London

Route

Depart

Return

Price

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Thu 19/2

11:55-17:20

1 stop11h 25m

Chicago O'Hare Intl

Mon 23/2

18:30-10:55

1 stop10h 25m

£395

LondonChicago

LGW - MDW

LGWMDW

London Gatwick

Mon 9/3

14:00-18:13

1 stop33h 13m

Chicago Midway

Mon 23/3

21:51-10:00

1 stop31h 09m

£396

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Tue 17/3

11:55-18:20

1 stop11h 25m

Chicago O'Hare Intl

Fri 22/5

19:25-14:40

1 stop13h 15m

£402

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Wed 18/3

11:55-18:20

1 stop11h 25m

Chicago O'Hare Intl

Tue 19/5

22:25-14:40

1 stop10h 15m

£402

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Mon 13/4

15:40-18:15

1 stop32h 35m

Chicago O'Hare Intl

Tue 21/4

19:25-14:40

1 stop13h 15m

£413

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 19/2

12:15-17:20

1 stop11h 05m

Chicago O'Hare Intl

Mon 23/2

18:30-10:50

1 stop10h 20m

£418

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 12/3

07:05-17:45

2 stops15h 40m

Chicago O'Hare Intl

Thu 19/3

20:20-19:55

2 stops18h 35m

£424

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Thu 26/2

14:00-19:47

1 stop35h 47m

Chicago O'Hare Intl

Mon 2/3

12:44-10:00

1 stop15h 16m

£427

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Mon 9/3

14:00-23:19

1 stop14h 19m

Lambert-St Louis

Mon 23/3

12:16-10:00

2 stops40h 44m

£428

LondonChicago

LGW - MDW

LGWMDW

London Gatwick

Thu 5/3

14:00-13:08

1 stop29h 08m

Chicago Midway

Sun 8/3

07:30-06:00

1 stop17h 30m

£429

Flights are sorted by cheapest return flights first.

Deals found on 6/2

Showing 1-10 of 33 results
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Best time to book a flight to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois with our price prediction graph.
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 to Illinois

How long is the flight to Illinois?

On average, a flight from London to Illinois takes 17 hours 2 minutes. Flights to Illinois from other popular cities in United Kingdom will vary in length. Below are a few examples of popular routes and their flight times.

Weekly flight availability to Illinois

The most flights from London to Illinois are scheduled on a Wednesday (36 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (22 on average).

What are the cheapest airlines that fly to Illinois?

The cheapest airlines flying from London to Illinois are Scandinavian Airlines, Icelandair and Virgin Atlantic.

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 43.0 - 125.0 inches per month. August is typically the wettest month, when rainfall can reach 125.0 mm. January is typically the driest time to visit Illinois when rainfall is around 43.0 mm.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, 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 23.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -5.0 C).

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated 8 February 2026.
See what other customers who have flown with United Airlines, Aer Lingus, andIcelandair to the United States have to say. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Comfort

7.3

Boarding

7.7

Food

6.6

Overall

7.4

Entertainment

7.1

Crew

8.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.

Comfort

7.3

Boarding

7.7

Food

6.6

Overall

7.4

Entertainment

7.1

Crew

8.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.

Comfort

7.3

Boarding

7.7

Food

6.6

Overall

7.4

Entertainment

7.1

Crew

8.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.

Comfort

7.3

Boarding

7.7

Food

6.6

Overall

7.4

Entertainment

7.1

Crew

8.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.

Comfort

7.3

Boarding

7.7

Food

6.6

Overall

7.4

Entertainment

7.1

Crew

8.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.

Comfort

7.3

Boarding

7.7

Food

6.6

Overall

7.4

Entertainment

7.1

Crew

8.1

Reviews

1 / 20
8.0
Excellent

Anonymous,Oct 2025

YUL - ORD

Crew and customer service are 5 stars. I had a lot of luggage for a very long trip and they were nothing but helpful and found solutions to every problem. It was my first time flying with United, and they really are the friendly skies. Leg room however, on 2/3 flights was terrible. Same for entertainment: There was only a seat-mounted screen on 1/3 flights. It would have been nice to have on the longest leg of the journey.

FAQs about flying to Illinois

Illinois climate

Illinois’s winters are very cold and long with snow and icy winds from late November through to April. Summers, especially July and August, the weather tends to be hot and humid. The best times to visit is when the weather is perfect, in spring and autumn; tornado season can occur anytime between the months of March and May. Chicago’s summers are humid with highs of 30 degrees (Celsius) or more and its winters are bitterly cold.

Getting around Illinois

Public transportation is reliable and taxis are easy to find. Driving is not recommended because of heavy traffic and parking is almost impossible to find. The El, a system operated by The Chicago Transit Authority consists of elevated trains running 24 hours a day. During the summer rush hour a River Bus is available.

What is good to know if travelling to Illinois?

  • Chicago has a wealth of things to see and do. The best view of the city can be found at 1,450 feet from the top of North America’s tallest building – the Sears Tower. Head to the 103rd floor to the Skydeck where you can see the entire city laid out.  The Hancock Building is also well worth a visit and offers stunning city views from its observation deck or cocktail bar.
  • Don’t miss a trip to the Anderson Japanese Gardens in Rockford. Set on twelve acres the gardens are adorned with Japanese maples, magnolias, and rhododendrons and have several ponds and waterfalls with Japanese bronze structures surrounding them. There’s also an authentic tea house and contemporary “Garden of Reflection”.  
  • Visit the preserved Frank Lloyd Wright Museum on Chicago Avenue in Oak Park where the famed architect spent 20 years of his career and designed 130 of his masterpieces.  Wright lived here until 1909.
  • One of the most visited attractions in Chicago is the Art Institute of Chicago. Art lovers – well any visitor – shouldn’t miss a trip to the museum, it’s remarkable. The gargantuan building houses more than 250,000 works of art from all over the world including ancient Egyptian, Japanese, Korean, Greek and Roman relics. One of its highlights is the anthology of Impressionist art which has an impressive collection by Monet, Pablo Picasso and Henri Matisse to name a few.
  • Anyone interested in the lives of the Amish people should head to central Illinois where a welcoming group of Amish villages are set up. Take a tour of the community in the Illinois Amish Interpretative Centre in Arcola, visit a working farm and watch how supper is prepared and enjoyed in a family home.
  • When is the best time to fly to Illinois?

    Peak Season: Winter is peak season in Illinois for skiing and snowmobiling. In summer many different festivals take place in Chicago’s parks and neighbourhoods almost every weekend, making it difficult to find a cheap Illinois flight. Off Season: The best month to book a cheap Illinois flight is September, which is also the mildest month. Autumn is visually the prettiest time to visit when the temperature is still mild and the foliage is changing. The quietest months in Chicago are from January to March but they can also be the coldest and windiest.

  • Can I find cheaper flights to Illinois if I am willing to have stopovers?

    Yes, flights with stopovers are often cheaper than direct flights. Keep an eye out for flight deals to Illinois on Cheapflights that require 1 or 2 stops for potential cost savings.

  • What is the best airline to fly to Illinois?

    Based on reviews from Cheapflights users, Icelandair is rated the highest out of the airlines that fly to Illinois.

  • What is the cheapest airport to fly to in Illinois?

    Chicago O'Hare Intl is currently the cheapest airport to fly to in Illinois. One-way flights to Chicago O'Hare Intl typically cost £27, while return flights cost around £41.

  • How much is a return flight to Illinois?

    A return flight to Illinois will typically cost around £40, however they can be found for as little as £38.

  • Where does the fastest flight to Illinois depart from?

    For those looking to save time traveling to Illinois, London offers the quickest one-way flight (8 hours 35 minutes).

  • Does Chicago O'Hare Intl have car hire?

    Yes. Those touching down at Chicago O'Hare Intl can take advantage of the car hire services offered upon their arrival.

  • Are there hotels close to Chicago O'Hare Intl?

    Yes. Chicago O'Hare Intl has hotels nearby for those requiring accommodations. Hilton Chicago O'Hare Airport is the closest property to Chicago O'Hare Intl (0.0 mi away from Chicago O'Hare Intl).

See more FAQs

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