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£260+ 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 29/5. Fares are subject to change and may not be available on all flights or dates of travel.
— ORD
5 May — 12 May1
1 adult

Flights to Illinois in 2025

Find the latest flights to Illinois in 2025, 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 30 April 2025.

Return from

£415

One-way from

£260

Popular in

August

Cheapest in

February

Average price

£504

Good round-trip deal

£537 or less

Good one-way deal

£532 or less
Icelandair
  • Icelandair
  • 28/8-7/9
  • 2 total stops
  • 24h 40m total
  • London to Chicago
29/5
  • 29/5
  • 1 total stop
  • 15h 52m total
  • London to Illinois
Highest demand for flights based on searches. 12% potential increase in price (£58 potential increase over avg. return price).
Cheapest flight prices on average. 2% potential price decrease (£11 potential savings vs. average return price).
Average for return flights in April 2025
Price to beat on a round-trip flight from London to Illinois.
Price to beat on a one-way flight from London to Illinois.

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 30 April 2025
Explore Illinois

Find flight deals to Illinois

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 30 April 2025.

Mon 5/506:00LHR - ORD
1 stop13h 20mMultiple Airlines
Mon 12/519:05ORD - LHR
1 stop11h 55mMultiple Airlines
Deal found 28/4£414
Thu 8/509:00LHR - ORD
1 stop15h 15mLufthansa
Fri 16/518:05ORD - LHR
Nonstop8h 15mLufthansa
Deal found 29/4£415
Thu 8/508:40LHR - ORD
2 stops15h 42mAir Canada
Sun 11/512:00ORD - LHR
2 stops12h 30mAir Canada
Deal found 29/4£415
Thu 25/915:40LGW - ORD
1 stop32h 35mIcelandair
Mon 29/919:25ORD - LGW
1 stop13h 10mIcelandair
Deal found 29/4£416
Tue 13/512:10LHR - ORD
1 stop33h 45mUnited Airlines
Wed 21/516:25ORD - LHR
1 stop32h 30mUnited Airlines
Deal found 29/4£416
Tue 16/913:10LHR - ORD
Nonstop8h 45mBritish Airways
Tue 23/920:40ORD - LHR
Nonstop7h 50mBritish Airways
Deal found 29/4£419
Thu 15/513:05LHR - ORD
1 stop14h 10mIcelandair
Tue 3/619:25ORD - LHR
1 stop18h 55mIcelandair
Deal found 29/4£420
Thu 18/908:45LCY - ORD
1 stop17h 10mMultiple Airlines
Mon 22/916:00ORD - LCY
1 stop18h 25mMultiple Airlines
Deal found 29/4£423
Fri 5/1214:10LHR - ORD
Nonstop8h 50mFinnair
Sat 17/118:45ORD - LHR
Nonstop7h 50mFinnair
Deal found 30/4£435
Tue 20/513:40LGW - ORD
2 stops23h 47mMultiple Airlines
Fri 11/713:03ORD - LGW
1 stop14h 57mMultiple Airlines
Deal found 29/4£438
Mon 8/1207:05LHR - ORD
2 stops15h 40mScandinavian Airlines
Sun 14/1219:20ORD - LHR
1 stop14h 40mScandinavian Airlines
Deal found 29/4£438
Fri 5/908:30LHR - ORD
Nonstop9h 00mAustrian Airlines
Wed 17/918:00ORD - LHR
Nonstop8h 20mAustrian Airlines
Deal found 29/4£439

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 30 April 2025.
Use the filters below to find and compare flights to Illinois that are best for you.

Fly from

London

Route

Depart

Return

Price

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 28/8

13:05-21:15

1 stop14h 10m

Chicago O'Hare Intl

Sun 7/9

19:25-11:55

1 stop10h 30m

£415

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 13/5

12:10-15:55

1 stop33h 45m

Chicago O'Hare Intl

Wed 21/5

16:25-06:55

1 stop32h 30m

£416

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Thu 25/9

15:40-18:15

1 stop32h 35m

Chicago O'Hare Intl

Mon 29/9

19:25-14:35

1 stop13h 10m

£416

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 10/5

06:00-19:30

2 stops19h 30m

Chicago O'Hare Intl

Sun 18/5

10:53-10:00

2 stops17h 07m

£417

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 16/9

13:10-15:55

Nonstop8h 45m

Chicago O'Hare Intl

Tue 23/9

20:40-10:30

Nonstop7h 50m

£419

LondonChicago

LCY - ORD

LCYORD

London City

Thu 18/9

08:45-19:55

1 stop17h 10m

Chicago O'Hare Intl

Mon 22/9

16:00-16:25

1 stop18h 25m

£423

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 16/5

14:25-17:00

Nonstop8h 35m

Chicago O'Hare Intl

Tue 20/5

11:50-06:15

1 stop12h 25m

£423

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 15/5

08:40-14:10

1 stop11h 30m

Chicago O'Hare Intl

Tue 20/5

07:00-06:25

1 stop17h 25m

£426

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 13/5

06:00-12:10

1 stop12h 10m

Chicago O'Hare Intl

Wed 21/5

18:19-21:00

2 stops20h 41m

£429

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 13/5

11:05-14:10

Nonstop9h 05m

Chicago O'Hare Intl

Wed 21/5

19:45-12:20

1 stop34h 35m

£432

Flights are sorted by cheapest return flights first.

Deals found on 29/4

Showing 1-10 of 60 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 18 hours 5 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.

When is the cheapest time to fly to Illinois?

Use this chart to determine the cheapest time to fly return from London to Illinois. Price data was last updated on 28 April 2024.

Users looking for the lowest fares to Illinois should consider flying on Thursday afternoons, when prices are typically cheapest. Budget-minded travellers will want to avoid Saturday afternoons, when prices are usually at their highest.

Weekly flight availability to Illinois

The most flights from London to Illinois are scheduled on a Monday (53 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (46 on average).

What are the cheapest airlines that fly to Illinois?

The cheapest airlines flying from London to Illinois are Icelandair, Scandinavian Airlines and TAP AIR PORTUGAL.

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 30 April 2025.
To help decide which airline to fly to Illinois, see what other customers have to say about Delta, KLM and LOT. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
8.0
Very Good

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Boarding

8.2

Entertainment

7.9

Food

7.3

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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 £29, while return flights cost around £44.

  • How much is a return flight to Illinois?

    A return flight to Illinois will typically cost around £508, however they can be found for as little as £58.

  • 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 25 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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