Find flights
Deals
Airlines
Travel Guide

£289+ 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 21/8. Fares are subject to change and may not be available on all flights or dates of travel.
— ORD
16 Jul — 23 Jul1
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 11 July 2025.

Return from

£408

One-way from

£289

Popular in

August

Cheapest in

February

Average price

£648

Good round-trip deal

£541 or less

Good one-way deal

£598 or less
TAP AIR PORTUGAL
  • TAP AIR PORTUGAL
  • 23/10-31/10
  • 2 total stops
  • 67h 10m total
  • London to Chicago
21/8
  • 21/8
  • 1 total stop
  • 30h 21m total
  • London to Illinois
Highest demand for flights based on searches. 12% potential increase in price (£53 potential increase over avg. return price).
Cheapest flight prices on average. 2% potential price decrease (£10 potential savings vs. average return price).
Average for return flights in July 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 11 July 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 11 July 2025.

Thu 23/1010:35LGW - ORD
1 stop35h 35mTAP AIR PORTUGAL
Fri 31/1021:15ORD - LGW
1 stop31h 35mTAP AIR PORTUGAL
Deal found 10/7£408
Mon 1/1219:50LHR - ORD
2 stops50h 55mScandinavian Airlines
Sun 11/119:10ORD - LHR
1 stop14h 50mScandinavian Airlines
Deal found 10/7£408
Sun 24/818:45LHR - ORD
1 stop27h 55mTAP AIR PORTUGAL
Sun 31/818:00ORD - LHR
1 stop17h 45mTAP AIR PORTUGAL
Deal found 10/7£409
Mon 1/915:40LGW - ORD
1 stop11h 35mIcelandair
Mon 3/1118:30ORD - LGW
1 stop10h 25mIcelandair
Deal found 9/7£410
Sat 20/909:50LGW - ORD
2 stops24h 56mMultiple Airlines
Mon 29/910:27ORD - LGW
1 stop14h 28mMultiple Airlines
Deal found 9/7£411
Sat 6/906:30LHR - ORD
1 stop14h 25mLufthansa
Sun 14/916:00ORD - LHR
Nonstop8h 20mLufthansa
Deal found 10/7£411
Sat 6/921:25LHR - ORD
1 stop29h 50mIcelandair
Fri 12/922:15ORD - LHR
1 stop16h 05mIcelandair
Deal found 10/7£411
Thu 18/909:50LHR - ORD
1 stop11h 55mBritish Airways
Tue 30/916:55ORD - LHR
Nonstop7h 55mBritish Airways
Deal found 9/7£413
Tue 16/915:05LGW - ORD
1 stop24h 10mAmerican Airlines
Fri 26/913:59ORD - LGW
1 stop12h 11mAmerican Airlines
Deal found 11/7£417
Wed 10/908:40LHR - ORD
1 stop13h 15mMultiple Airlines
Sun 21/916:00ORD - LHR
Nonstop8h 20mMultiple Airlines
Deal found 10/7£417
Mon 15/911:35LGW - ORD
2 stops27h 40mBritish Airways
Mon 22/913:59ORD - LGW
1 stop12h 11mBritish Airways
Deal found 11/7£418
Mon 8/906:00LHR - ORD
1 stop15h 55mSWISS
Mon 15/919:05ORD - LHR
1 stop16h 45mSWISS
Deal found 9/7£419

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 11 July 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

Thu 23/10

10:35-16:10

1 stop35h 35m

Chicago O'Hare Intl

Fri 31/10

21:15-09:50

1 stop31h 35m

£408

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 1/12

19:50-16:45

2 stops50h 55m

Chicago O'Hare Intl

Wed 14/1

19:20-16:00

1 stop14h 40m

£408

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 24/8

18:45-16:40

1 stop27h 55m

Chicago O'Hare Intl

Sun 31/8

18:00-17:45

1 stop17h 45m

£409

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Mon 1/9

15:40-21:15

1 stop11h 35m

Chicago O'Hare Intl

Mon 3/11

18:30-10:55

1 stop10h 25m

£410

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Sat 20/9

09:50-04:46

2 stops24h 56m

Chicago O'Hare Intl

Mon 29/9

10:27-06:55

1 stop14h 28m

£411

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 6/9

08:30-14:55

1 stop12h 25m

Chicago O'Hare Intl

Sat 13/9

21:25-11:45

Nonstop8h 20m

£411

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 6/9

21:25-21:15

1 stop29h 50m

Chicago O'Hare Intl

Fri 12/9

22:15-20:20

1 stop16h 05m

£411

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 18/9

09:50-15:45

1 stop11h 55m

Chicago O'Hare Intl

Tue 30/9

16:55-06:50

Nonstop7h 55m

£413

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Tue 16/9

15:05-09:15

1 stop24h 10m

Chicago O'Hare Intl

Fri 26/9

13:59-08:10

1 stop12h 11m

£417

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 10/9

08:40-15:55

1 stop13h 15m

Chicago O'Hare Intl

Sun 21/9

16:00-06:20

Nonstop8h 20m

£417

Flights are sorted by cheapest return flights first.

Deals found on 9/7

Showing 1-10 of 59 results
1
2
3
...
6

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 17 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.

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 16 December 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 (48 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 11 July 2025.
See what other customers who have flown with Delta, KLM, andAir Transat to the United States have to say. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
8.0
Very Good

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.

Food

7.3

Overall

8.0

Entertainment

7.9

Crew

8.5

Comfort

7.9

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.

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 £41, while return flights cost around £113.

  • How much is a return flight to Illinois?

    A return flight to Illinois will typically cost around £429, however they can be found for as little as £154.

  • Where does the fastest flight to Illinois depart from?

    For those looking to save time traveling to Illinois, London offers the quickest one-way flight (8 hours 25 minutes).

  • Which airport is closest to Drury Lane Theater?

    f being close to Drury Lane Theater is important to you, you’ll want to land at Chicago O'Hare Intl Airport.

  • 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights to Illinois?

Deals for Illinois flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose to your preference, such as price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets to Illinois?

Millions of users choose and trust Cheapflights to book the best flight deals to Illinois for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights to Illinois with no change fees?

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.

Can Cheapflights notify me if prices for flights to Illinois become cheaper?

Not ready to book yet? You can track prices for flights to Illinois on Cheapflights with our Price Alerts feature and get notified when better prices are available.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.