£344+ Cheap flights to Illinois

— ORD
10 Oct — 17 Oct1
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 16/915:40 -
1 stop11h 45m
Sun 15/1118:30 -
1 stop10h 25m
Deal found 6/9£524
Wed 28/1012:15 -
1 stop11h 05m
Sat 14/1118:30 -
1 stop10h 20m
Deal found 5/9£524
Tue 6/1013:10 -
1 stop12h 05m
Tue 13/1015:45 -
1 stop11h 30m
Deal found 6/9£524
Thu 24/909:25 -
1 stop12h 30m
Tue 29/914:40 -
1 stop11h 45m
Deal found 5/9£525
Thu 1/1006:00 -
1 stop12h 35m
Mon 5/1019:05 -
1 stop15h 20m
Deal found 4/9£525
Thu 22/1008:40 -
1 stop16h 35m
Thu 29/1021:05 -
1 stop11h 25m
Deal found 7/9£525
Sat 31/1006:00 -
1 stop12h 40m
Wed 4/1116:10 -
1 stop19h 40m
Deal found 6/9£525
Wed 14/1006:30 -
1 stop13h 30m
Wed 21/1015:45 -
1 stop12h 05m
Deal found 8/9£525
Thu 5/1116:00 -
1 stop29h 30m
Wed 11/1119:00 -
2 stops43h 35m
Deal found 7/9£526
Thu 17/913:05 -
1 stop11h 10m
Thu 12/1118:30 -
1 stop10h 20m
Deal found 6/9£526
Sun 22/1112:35 -
1 stop18h 07m
Wed 2/1206:15 -
1 stop18h 40m
Deal found 7/9£527
Thu 17/906:00 -
1 stop12h 35m
Wed 30/914:20 -
1 stop11h 35m
Deal found 8/9£527

Find flights to Illinois

Explore Illinois

Find flight deals to Illinois

Return from

£524

One-way from

£330

Popular in

August

Cheapest in

February

Average price

£587

Good round-trip deal

£604 or less

Good one-way deal

£517 or less
21/10-27/10
  • 21/10-27/10
  • 2 total stops
  • 28h 25m total
  • London to Chicago
4/11-31/12
  • 4/11-31/12
  • 3 total stops
  • 50h 50m total
  • London to Illinois
Highest demand for flights based on searches. 12% potential increase in price (£85 potential increase over avg. return price).
Cheapest flight prices on average. 2% potential price decrease (£15 potential savings vs. average return price).
Average for return flights in September 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

Sun 6/12

20:05-16:15

1 stop26h 10m

Chicago O'Hare Intl

Wed 31/12

00:00-07:00

Nonstop0h 00m

£349

LondonChicago

LTN London Luton - ORD Chicago O'Hare Intl

LTNORD

London Luton

Tue 6/10

13:10-19:15

1 stop12h 05m

Chicago O'Hare Intl

Tue 13/10

15:45-09:15

1 stop11h 30m

£524

LondonChicago

LTN London Luton - ORD Chicago O'Hare Intl

LTNORD

London Luton

Mon 19/10

08:15-14:00

1 stop11h 45m

Chicago O'Hare Intl

Wed 21/10

21:00-15:25

1 stop12h 25m

£528

LondonChicago

LHR London Heathrow - ORD Chicago O'Hare Intl

LHRORD

London Heathrow

Thu 5/11

08:50-14:10

1 stop11h 20m

Chicago O'Hare Intl

Thu 19/11

15:55-09:05

1 stop11h 10m

£537

LondonChicago

LHR London Heathrow - ORD Chicago O'Hare Intl

LHRORD

London Heathrow

Fri 27/11

12:10-18:20

1 stop12h 10m

Chicago O'Hare Intl

Thu 3/12

15:55-08:05

1 stop10h 10m

£537

LondonChicago

LTN London Luton - ORD Chicago O'Hare Intl

LTNORD

London Luton

Sat 3/10

11:00-19:15

1 stop14h 15m

Chicago O'Hare Intl

Mon 12/10

15:45-09:15

1 stop11h 30m

£537

LondonChicago

LHR London Heathrow - ORD Chicago O'Hare Intl

LHRORD

London Heathrow

Tue 22/9

13:25-19:15

1 stop11h 50m

Chicago O'Hare Intl

Wed 21/10

15:45-08:05

1 stop10h 20m

£539

LondonChicago

LHR London Heathrow - ORD Chicago O'Hare Intl

LHRORD

London Heathrow

Thu 17/9

06:00-13:20

1 stop13h 20m

Chicago O'Hare Intl

Wed 30/9

16:25-06:45

Nonstop8h 20m

£550

LondonChicago

LHR London Heathrow - ORD Chicago O'Hare Intl

LHRORD

London Heathrow

Mon 9/11

09:55-16:45

2 stops36h 50m

Chicago O'Hare Intl

Thu 12/11

19:15-09:35

2 stops32h 20m

£558

LondonChicago

LCY London City - ORD Chicago O'Hare Intl

LCYORD

London City

Sat 31/10

07:45-15:10

1 stop12h 25m

Chicago O'Hare Intl

Thu 12/11

15:55-08:35

1 stop10h 40m

£559

Flights are sorted by cheapest return flights first.

Deals found on 6/9

Showing 1-10 of 31 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 16 hours 50 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 Thursday, which is when the least amount of flights are scheduled (32 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.

Entertainment

7.1

Comfort

7.3

Boarding

7.7

Crew

8.1

Food

6.6

Overall

7.4

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!

Entertainment

7.1

Comfort

7.3

Boarding

7.7

Crew

8.1

Food

6.6

Overall

7.4

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!

Entertainment

7.1

Comfort

7.3

Boarding

7.7

Crew

8.1

Food

6.6

Overall

7.4

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!

Entertainment

7.1

Comfort

7.3

Boarding

7.7

Crew

8.1

Food

6.6

Overall

7.4

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!

Entertainment

7.1

Comfort

7.3

Boarding

7.7

Crew

8.1

Food

6.6

Overall

7.4

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!

Entertainment

7.1

Comfort

7.3

Boarding

7.7

Crew

8.1

Food

6.6

Overall

7.4

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 O'Hare Intl is currently the cheapest airport to fly to in Illinois. One-way flights to Chicago O'Hare Intl typically cost £40, while return flights cost around £85.

  • How much is a return flight to Illinois?

    A return flight to Illinois will typically cost around £85, however they can be found for as little as £85.

  • 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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