£352+ Cheap flights to Illinois

— ORD
18 Sep — 25 Sep1
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

Wed 30/911:45 -
1 stop13h 30m
Wed 7/1015:45 -
1 stop20h 40m
Deal found 16/8£468
Fri 4/906:35 -
1 stop18h 40m
Tue 8/921:00 -
1 stop18h 20m
Deal found 19/8£468
Wed 30/916:25 -
1 stop26h 15m
Sun 4/1018:00 -
1 stop15h 10m
Deal found 18/8£469
Thu 17/906:30 -
1 stop13h 30m
Thu 24/915:45 -
1 stop10h 05m
Deal found 17/8£469
Fri 4/915:35 -
2 stops32h 40m
Tue 8/919:25 -
2 stops14h 55m
Deal found 18/8£470
Sun 13/906:50 -
1 stop11h 10m
Sun 13/921:35 -
1 stop17h 05m
Deal found 16/8£470
Wed 9/922:45 -
1 stop21h 15m
Tue 15/921:00 -
1 stop19h 20m
Deal found 15/8£470
Wed 16/918:45 -
1 stop23h 55m
Thu 1/1018:00 -
1 stop22h 05m
Deal found 16/8£471
Fri 4/906:20 -
1 stop18h 55m
Tue 8/915:45 -
1 stop17h 45m
Deal found 19/8£471
Thu 10/906:30 -
1 stop18h 45m
Sun 13/921:00 -
1 stop20h 25m
Deal found 15/8£471
Tue 20/1017:50 -
2 stops30h 25m
Tue 27/1019:30 -
2 stops16h 20m
Deal found 18/8£471
Tue 15/906:55 -
1 stop13h 10m
Tue 15/918:15 -
1 stop10h 25m
Deal found 19/8£471

Find flights to Illinois

Explore Illinois

Find flight deals to Illinois

Return from

£468

One-way from

£327

Popular in

July

Cheapest in

February

Average price

£705

Good round-trip deal

£615 or less

Good one-way deal

£517 or less
30/9-7/10
  • 30/9-7/10
  • 2 total stops
  • 34h 10m total
  • London to Chicago
4/10
  • 4/10
  • 2 total stops
  • 29h 10m total
  • London to Illinois
Highest demand for flights based on searches. 16% potential increase in price (£112 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 August 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

 
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

LHR London Heathrow - ORD Chicago O'Hare Intl

LHRORD

London Heathrow

Tue 22/9

18:45-16:00

1 stop27h 15m

Chicago O'Hare Intl

Wed 21/10

18:00-18:50

1 stop18h 50m

£476

LondonChicago

LHR London Heathrow - ORD Chicago O'Hare Intl

LHRORD

London Heathrow

Wed 7/10

18:45-12:40

1 stop23h 55m

Chicago O'Hare Intl

Wed 21/10

18:00-22:55

1 stop22h 55m

£476

LondonChicago

LTN London Luton - ORD Chicago O'Hare Intl

LTNORD

London Luton

Wed 14/10

13:50-19:15

1 stop11h 25m

Chicago O'Hare Intl

Fri 16/10

21:00-14:00

1 stop11h 00m

£482

LondonChicago

LTN London Luton - ORD Chicago O'Hare Intl

LTNORD

London Luton

Mon 28/9

08:15-14:00

1 stop11h 45m

Chicago O'Hare Intl

Mon 5/10

15:45-12:45

1 stop15h 00m

£488

LondonChicago

LTN London Luton - ORD Chicago O'Hare Intl

LTNORD

London Luton

Wed 11/11

21:45-17:20

2 stops25h 35m

Chicago O'Hare Intl

Mon 23/11

20:10-18:00

1 stop15h 50m

£501

LondonChicago

LTN London Luton - ORD Chicago O'Hare Intl

LTNORD

London Luton

Wed 9/9

13:50-19:15

1 stop11h 25m

Chicago O'Hare Intl

Wed 16/9

15:45-09:00

1 stop11h 15m

£514

LondonChicago

LTN London Luton - ORD Chicago O'Hare Intl

LTNORD

London Luton

Thu 12/11

08:20-17:20

2 stops15h 00m

Chicago O'Hare Intl

Mon 23/11

20:10-18:00

1 stop15h 50m

£521

LondonChicago

LGW London Gatwick - ORD Chicago O'Hare Intl

LGWORD

London Gatwick

Wed 11/11

11:55-17:20

1 stop11h 25m

Chicago O'Hare Intl

Sun 15/11

18:30-10:55

1 stop10h 25m

£547

LondonChicago

LHR London Heathrow - ORD Chicago O'Hare Intl

LHRORD

London Heathrow

Thu 3/9

21:25-21:25

1 stop30h 00m

Chicago O'Hare Intl

Wed 7/10

22:25-20:20

1 stop15h 55m

£554

LondonChicago

LHR London Heathrow - ORD Chicago O'Hare Intl

LHRORD

London Heathrow

Wed 7/10

07:05-16:10

2 stops15h 05m

Chicago O'Hare Intl

Wed 21/10

19:15-16:00

1 stop14h 45m

£558

Flights are sorted by cheapest return flights first.

Deals found on 18/8

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

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 17 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 (49 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (49 on average).

What are the cheapest airlines that fly to Illinois?

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

Rainfall in Illinois 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

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 79 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

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.

Boarding

7.7

Overall

7.4

Entertainment

7.1

Food

6.7

Crew

8.1

Comfort

7.3

Reviews

1 / 20
4.0
Okay

Chris,Aug 2026

MIA - ORD

Had to go through TSA again, already purchased bottle drink. TSA would not let through, United changed gates last minute. This experience bad for everyone. Staff rude, not our fault. Staff from Chicago to Wichita excellent!

Boarding

7.7

Overall

7.4

Entertainment

7.1

Food

6.7

Crew

8.1

Comfort

7.3

Reviews

1 / 20
4.0
Okay

Chris,Aug 2026

MIA - ORD

Had to go through TSA again, already purchased bottle drink. TSA would not let through, United changed gates last minute. This experience bad for everyone. Staff rude, not our fault. Staff from Chicago to Wichita excellent!

Boarding

7.7

Overall

7.4

Entertainment

7.1

Food

6.7

Crew

8.1

Comfort

7.3

Reviews

1 / 20
4.0
Okay

Chris,Aug 2026

MIA - ORD

Had to go through TSA again, already purchased bottle drink. TSA would not let through, United changed gates last minute. This experience bad for everyone. Staff rude, not our fault. Staff from Chicago to Wichita excellent!

Boarding

7.7

Overall

7.4

Entertainment

7.1

Food

6.7

Crew

8.1

Comfort

7.3

Reviews

1 / 20
4.0
Okay

Chris,Aug 2026

MIA - ORD

Had to go through TSA again, already purchased bottle drink. TSA would not let through, United changed gates last minute. This experience bad for everyone. Staff rude, not our fault. Staff from Chicago to Wichita excellent!

Boarding

7.7

Overall

7.4

Entertainment

7.1

Food

6.7

Crew

8.1

Comfort

7.3

Reviews

1 / 20
4.0
Okay

Chris,Aug 2026

MIA - ORD

Had to go through TSA again, already purchased bottle drink. TSA would not let through, United changed gates last minute. This experience bad for everyone. Staff rude, not our fault. Staff from Chicago to Wichita excellent!

Boarding

7.7

Overall

7.4

Entertainment

7.1

Food

6.7

Crew

8.1

Comfort

7.3

Reviews

1 / 20
4.0
Okay

Chris,Aug 2026

MIA - ORD

Had to go through TSA again, already purchased bottle drink. TSA would not let through, United changed gates last minute. This experience bad for everyone. Staff rude, not our fault. Staff from Chicago to Wichita excellent!

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 Midway is currently the cheapest airport to fly to in Illinois. One-way flights to Chicago Midway typically cost £78, while return flights cost around £131.

  • How much is a return flight to Illinois?

    A return flight to Illinois will typically cost around £132, however they can be found for as little as £131.

  • 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).

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

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