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£284+ 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 13/5. Fares are subject to change and may not be available on all flights or dates of travel.
— ORD
25 Mar — 1 Apr1
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 20 March 2025.

Return from

£414

One-way from

£284

Popular in

August

Cheapest in

February

Average price

£493

Good round-trip deal

£561 or less

Good one-way deal

£583 or less
29/4-16/7
  • 29/4-16/7
  • 3 total stops
  • 57h 21m total
  • London to Chicago
13/5
  • 13/5
  • 1 total stop
  • 16h 06m 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 March 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 20 March 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 20 March 2025.

Tue 29/410:00LGW - ORD
1 stop34h 26mMultiple Airlines
Wed 16/705:05ORD - LGW
2 stops22h 55mMultiple Airlines
Deal found 19/3£414
Thu 27/306:00LHR - ORD
1 stop12h 55mSWISS
Sun 30/315:45ORD - LHR
1 stop21h 35mSWISS
Deal found 19/3£414
Wed 17/915:40LGW - ORD
1 stop11h 35mIcelandair
Tue 30/919:25ORD - LGW
1 stop13h 15mIcelandair
Deal found 19/3£415
Wed 23/408:40LHR - ORD
1 stop13h 15mUnited Airlines
Tue 13/508:50ORD - LHR
1 stop16h 05mUnited Airlines
Deal found 20/3£415
Sun 20/406:30LHR - ORD
1 stop14h 15mLufthansa
Fri 9/521:20ORD - LHR
Nonstop8h 25mLufthansa
Deal found 19/3£416
Tue 29/421:25LHR - ORD
1 stop26h 50mIcelandair
Fri 18/719:25ORD - LHR
1 stop10h 30mIcelandair
Deal found 19/3£418
Tue 22/422:35STN - ORD
2 stops25h 40mMultiple Airlines
Mon 28/419:25ORD - STN
2 stops19h 35mMultiple Airlines
Deal found 20/3£418
Sat 19/412:15LHR - ORD
Nonstop8h 30mFinnair
Fri 2/522:20ORD - LHR
Nonstop7h 55mFinnair
Deal found 20/3£420
Sat 26/412:15LHR - ORD
Nonstop8h 30mBritish Airways
Thu 1/522:20ORD - LHR
Nonstop7h 55mBritish Airways
Deal found 19/3£424
Wed 23/406:50LHR - ORD
2 stops14h 05mAir Canada
Sat 3/515:35ORD - LHR
1 stop12h 25mAir Canada
Deal found 20/3£425
Sat 3/506:30LHR - ORD
1 stop12h 25mMultiple Airlines
Tue 13/517:50ORD - LHR
1 stop10h 25mMultiple Airlines
Deal found 19/3£426
Wed 23/411:45LHR - ORD
2 stops18h 14mVirgin Atlantic
Sun 18/518:18ORD - LHR
1 stop11h 07mVirgin Atlantic
Deal found 19/3£428

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 20 March 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

LGW - ORD

LGWORD

London Gatwick

Tue 29/4

10:00-14:26

1 stop34h 26m

Chicago O'Hare Intl

Wed 16/7

05:05-10:00

2 stops22h 55m

£414

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 21/4

21:25-18:15

1 stop26h 50m

Chicago O'Hare Intl

Fri 25/4

22:15-20:20

1 stop16h 05m

£414

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 23/4

08:40-15:55

1 stop13h 15m

Chicago O'Hare Intl

Tue 13/5

08:50-06:55

1 stop16h 05m

£415

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 20/4

06:30-14:45

1 stop14h 15m

Chicago O'Hare Intl

Fri 9/5

21:20-11:45

Nonstop8h 25m

£416

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Thu 22/5

15:40-21:15

1 stop11h 35m

Chicago O'Hare Intl

Mon 26/5

19:25-14:35

1 stop13h 10m

£416

LondonChicago

STN - ORD

STNORD

London Stansted

Tue 22/4

22:35-18:15

2 stops25h 40m

Chicago O'Hare Intl

Mon 28/4

19:25-21:00

2 stops19h 35m

£418

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 19/4

12:15-14:45

Nonstop8h 30m

Chicago O'Hare Intl

Fri 2/5

22:20-12:15

Nonstop7h 55m

£420

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 26/4

12:15-14:45

Nonstop8h 30m

Chicago O'Hare Intl

Thu 1/5

22:20-12:15

Nonstop7h 55m

£424

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 23/4

06:50-14:55

2 stops14h 05m

Chicago O'Hare Intl

Sat 3/5

15:35-10:00

1 stop12h 25m

£425

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 3/5

06:30-12:55

1 stop12h 25m

Chicago O'Hare Intl

Tue 13/5

17:50-10:15

1 stop10h 25m

£426

Flights are sorted by cheapest return flights first.

Deals found on 18/3

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 16 hours 39 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 evenings, when prices are usually at their highest.

Weekly flight availability to Illinois

The most flights from London to Illinois are scheduled on a Monday (37 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (36 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 20 March 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.

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

Food

7.3

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

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

Food

7.3

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

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

Food

7.3

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

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

Food

7.3

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

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

Food

7.3

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

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

8.0

Overall

8.0

Food

7.3

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 £16, while return flights cost around £46.

  • How much is a return flight to Illinois?

    A return flight to Illinois will typically cost around £445, however they can be found for as little as £59.

  • 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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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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