£433+ 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 9/8. Fares are subject to change and may not be available on all flights or dates of travel.
— ORD
26 Jun — 3 Jul1
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 27 May 2026.

Wed 9/914:00
LGW
-
ORD
1 stop15h 55m
Multiple Airlines
Wed 16/922:25
ORD
-
LGW
1 stop10h 15m
Multiple Airlines
Deal found 26/5£520
Thu 10/913:05
LHR
-
ORD
1 stop11h 10m
Icelandair
Thu 24/919:25
ORD
-
LHR
1 stop18h 55m
Icelandair
Deal found 24/5£520
Wed 14/1016:25
LGW
-
ORD
1 stop26h 15m
TAP AIR PORTUGAL
Wed 21/1018:00
ORD
-
LGW
2 stops35h 20m
TAP AIR PORTUGAL
Deal found 25/5£521
Wed 14/1007:05
LHR
-
ORD
2 stops15h 05m
Scandinavian Airlines
Wed 28/1020:15
ORD
-
LHR
2 stops17h 35m
Scandinavian Airlines
Deal found 26/5£521
Fri 23/1007:05
LHR
-
ORD
2 stops15h 05m
Scandinavian Airlines
Mon 2/1119:15
ORD
-
LHR
1 stop17h 15m
Scandinavian Airlines
Deal found 26/5£522
Wed 23/916:25
LGW
-
ORD
1 stop26h 15m
TAP AIR PORTUGAL
Thu 1/1018:00
ORD
-
LGW
1 stop33h 45m
TAP AIR PORTUGAL
Deal found 23/5£523
Thu 1/1007:05
LHR
-
ORD
2 stops15h 05m
Scandinavian Airlines
Sun 11/1019:15
ORD
-
LHR
1 stop20h 25m
Scandinavian Airlines
Deal found 22/5£523
Tue 8/916:25
LGW
-
ORD
1 stop29h 35m
TAP AIR PORTUGAL
Wed 23/918:00
ORD
-
LGW
1 stop14h 00m
TAP AIR PORTUGAL
Deal found 26/5£523
Tue 1/910:50
LTN
-
ORD
2 stops37h 00m
Multiple Airlines
Mon 14/915:45
ORD
-
LTN
1 stop11h 30m
Multiple Airlines
Deal found 25/5£523
Thu 8/1014:50
LGW
-
ORD
1 stop31h 10m
TAP AIR PORTUGAL
Sun 11/1018:00
ORD
-
LGW
2 stops20h 25m
TAP AIR PORTUGAL
Deal found 25/5£524
Fri 9/1006:40
LHR
-
ORD
1 stop15h 30m
Scandinavian Airlines
Mon 19/1019:15
ORD
-
LHR
2 stops15h 10m
Scandinavian Airlines
Deal found 25/5£524
Thu 27/819:30
LHR
-
ORD
1 stop26h 40m
Scandinavian Airlines
Sun 30/819:15
ORD
-
LHR
1 stop20h 25m
Scandinavian Airlines
Deal found 25/5£525

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 27 May 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 27 May 2026.

Return from

£520

One-way from

£287

Popular in

July

Cheapest in

February

Average price

£581

Good round-trip deal

£699 or less

Good one-way deal

£577 or less
Icelandair
  • Icelandair
  • 9/9-16/9
  • 2 total stops
  • 26h 10m total
  • London to Chicago
29/8
  • 29/8
  • 3 total stops
  • 30h 07m total
  • London to Illinois
Highest demand for flights based on searches. 11% potential increase in price (£70 potential increase over avg. return price).
Cheapest flight prices on average. 2% potential price decrease (£12 potential savings vs. average return price).
Average for return flights in May 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 27 May 2026.
Use the filters below to find and compare flights to Illinois that are best for you.

Fly from

Route

Depart

Return

Price

Cheapest return flight

LondonChicago

LTN - ORD

LTNORD

London Luton

Thu 18/6

12:45-16:00

2 stops33h 15m

Chicago O'Hare Intl

Thu 24/9

19:25-20:30

2 stops19h 05m

£582

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 8/6

21:05-16:10

2 stops25h 05m

Chicago O'Hare Intl

Fri 16/10

19:15-16:00

1 stop14h 45m

£584

LondonChicago

LTN - ORD

LTNORD

London Luton

Fri 25/9

08:30-18:15

2 stops15h 45m

Chicago O'Hare Intl

Sun 27/9

22:25-22:20

2 stops17h 55m

£600

LondonChicago

LTN - ORD

LTNORD

London Luton

Wed 8/7

06:15-16:57

2 stops16h 42m

Chicago O'Hare Intl

Wed 22/7

22:25-22:15

2 stops17h 50m

£614

LondonChicago

LHR - MDW

LHRMDW

London Heathrow

Wed 16/9

09:55-22:25

2 stops18h 30m

Chicago Midway

Wed 23/9

13:00-06:25

1 stop11h 25m

£624

LondonChicago

LHR - MDW

LHRMDW

London Heathrow

Wed 9/9

06:30-18:05

2 stops17h 35m

Chicago Midway

Wed 23/9

17:10-11:20

1 stop12h 10m

£625

LondonChicago

LTN - ORD

LTNORD

London Luton

Tue 1/9

15:15-18:15

2 stops33h 00m

Chicago O'Hare Intl

Tue 22/9

19:25-22:50

2 stops21h 25m

£627
Fastest return journey

LondonChicago

LCY - ORD

LCYORD

London City

Wed 9/9

10:00-14:30

1 stop10h 30m

Chicago O'Hare Intl

Wed 23/9

16:50-08:50

1 stop10h 00m

£650

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 4/9

19:50-21:52

2 stops32h 02m

Chicago O'Hare Intl

Sun 13/9

19:15-17:40

1 stop16h 25m

£653

LondonChicago

LCY - ORD

LCYORD

London City

Tue 3/11

10:00-20:24

2 stops16h 24m

Chicago O'Hare Intl

Tue 17/11

18:10-16:35

2 stops16h 25m

£653

Flights are sorted by cheapest return flights first.

Deals found on 24/5

Showing 1-10 of 33 resultsSorted by cheapest first
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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 18 hours 26 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 Monday (52 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (47 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).

When is the best time to book a flight to Illinois?

The best time to book flights to Illinois is 34 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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 27 May 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.

Entertainment

7.1

Comfort

7.3

Crew

8.1

Food

6.6

Boarding

7.7

Overall

7.4

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.

Entertainment

7.1

Comfort

7.3

Crew

8.1

Food

6.6

Boarding

7.7

Overall

7.4

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.

Entertainment

7.1

Comfort

7.3

Crew

8.1

Food

6.6

Boarding

7.7

Overall

7.4

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.

Entertainment

7.1

Comfort

7.3

Crew

8.1

Food

6.6

Boarding

7.7

Overall

7.4

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.

Entertainment

7.1

Comfort

7.3

Crew

8.1

Food

6.6

Boarding

7.7

Overall

7.4

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.

Entertainment

7.1

Comfort

7.3

Crew

8.1

Food

6.6

Boarding

7.7

Overall

7.4

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, Ryanair 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 £42, while return flights cost around £73.

  • How much is a return flight to Illinois?

    A return flight to Illinois will typically cost around £279, however they can be found for as little as £73.

  • Where does the fastest flight to Illinois depart from?

    For those looking to save time traveling to Illinois, Edinburgh Turnhouse offers the quickest one-way flight (8 hours 30 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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