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$176+ Cheap flights from Illinois to London (LON)

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 2/6. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LON
Dec 10 — Dec 171
Wed 12/10
Wed 12/17
1 adult, Economy
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Find flight deals from Illinois to London

Cheapest flights from Illinois to London
Explore the most affordable flight options available from Illinois to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 10, 2025.

This Rumbo deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Rumbo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/105:56 pmORD - LHR
1 stop11h 44mVirgin Atlantic
Tue 11/189:00 amLHR - ORD
1 stop12h 10mVirgin Atlantic
Deal found 11/9$543
This Mytrip deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/107:40 pmORD - LHR
1 stop11h 45mAer Lingus
Tue 11/1812:10 pmLHR - ORD
1 stop11h 45mAer Lingus
Deal found 11/8$545
This Kiwi.com deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/93:50 pmORD - LTN
1 stop11h 55mMultiple Airlines
Tue 12/169:00 amLTN - ORD
1 stop14h 55mMultiple Airlines
Deal found 11/9$545
This Mytrip deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/23:50 pmORD - STN
1 stop10h 00mMultiple Airlines
Wed 12/106:30 amSTN - ORD
1 stop17h 25mMultiple Airlines
Deal found 11/8$545
This oojo deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/66:30 pmORD - LHR
1 stop19h 00mIcelandair
Thu 1/88:35 pmLHR - ORD
1 stop26h 45mIcelandair
Deal found 11/9$546
This Mytrip deal was found by Cheapflights users on 11/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/37:40 pmORD - STN
1 stop13h 25mMultiple Airlines
Wed 12/106:30 amSTN - ORD
1 stop13h 30mMultiple Airlines
Deal found 11/7$546
This oojo deal was found by Cheapflights users on 11/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/148:15 pmORD - LGW
1 stop13h 30mTAP AIR PORTUGAL
Tue 11/184:35 pmLGW - ORD
1 stop28h 25mTAP AIR PORTUGAL
Deal found 11/8$547
This oojo deal was found by Cheapflights users on 11/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/37:10 pmORD - LHR
1 stop20h 25mTAP AIR PORTUGAL
Sun 12/76:00 amLHR - ORD
1 stop14h 45mTAP AIR PORTUGAL
Deal found 11/7$548
This Mytrip deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/23:50 pmORD - LTN
1 stop11h 55mMultiple Airlines
Sun 12/78:05 amLTN - ORD
1 stop11h 55mMultiple Airlines
Deal found 11/9$548
This Mytrip deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/23:50 pmORD - STN
1 stop10h 00mMultiple Airlines
Sun 12/76:30 amSTN - ORD
1 stop13h 30mMultiple Airlines
Deal found 11/9$548
This oojo deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/237:20 pmORD - LHR
2 stops15h 05mScandinavian Airlines
Wed 12/36:40 pmLHR - ORD
1 stop28h 05mScandinavian Airlines
Deal found 11/9$549
This Mytrip deal was found by Cheapflights users on 11/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/77:40 pmORD - LTN
1 stop10h 05mMultiple Airlines
Sun 12/148:05 amLTN - ORD
1 stop11h 55mMultiple Airlines
Deal found 11/9$549

Cheap flight deals from Illinois to London

Keep the following information in mind while searching for Illinois to London flight deals. Data was last updated November 10, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$545
(Cheapflightsfares)

One-way from

$176
(Trip.com)

Popular in

June

Cheapest in

February

Average price

$690

Good round-trip deal

$713 or less

Good one-way deal

$439 or less
Provider with most accurate pricing for Chicago (CHI)-London (LON) flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-London (LON) flights.
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From Illinois to London (LON)
Search Deals
One-way flight from Illinois to London (LON)
Search Deals
Highest demand for flights based on searches. 21% potential increase in price ($203 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($36 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
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Price to beat on a round-trip flight from Illinois to London (LON).
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Price to beat on a one-way flight from Illinois to London (LON).
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to London that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated November 10, 2025.
Use the filters below to find and compare flights from Illinois to London that are best for you.

Fly from

Illinois

Fly to

London

Route

Depart

Return

Price

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Tue 12/9

7:40 pm-6:20 pm

1 stop16h 40m

London Stansted

Tue 12/16

6:30 am-2:00 pm

1 stop13h 30m

$546

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Tue 12/2

3:50 pm-9:45 am

1 stop11h 55m

London Luton

Sun 12/7

8:05 am-2:00 pm

1 stop11h 55m

$548

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

Fri 1/16

9:00 pm-3:25 pm

1 stop12h 25m

London Luton

Tue 1/20

9:00 am-7:15 pm

1 stop16h 15m

$548

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Fri 1/16

9:00 pm-8:05 pm

1 stop17h 05m

London Stansted

Tue 1/20

6:30 am-7:15 pm

1 stop18h 45m

$548

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Sun 12/7

3:50 pm-9:50 am

1 stop12h 00m

London Stansted

Sun 12/14

6:30 am-2:00 pm

1 stop13h 30m

$548

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Tue 12/2

3:50 pm-7:50 am

1 stop10h 00m

London Stansted

Sun 12/7

6:30 am-2:00 pm

1 stop13h 30m

$548

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Sat 3/7

6:30 pm-10:55 am

1 stop10h 25m

London Gatwick

Wed 3/11

11:55 am-6:20 pm

1 stop11h 25m

$561

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 12/3

11:15 am-6:25 am

1 stop13h 10m

London Heathrow

Wed 12/10

6:20 am-6:02 pm

2 stops17h 42m

$589

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Sun 11/30

9:41 am-7:05 am

1 stop15h 24m

London Heathrow

Tue 12/9

11:30 am-11:47 pm

2 stops18h 17m

$589

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 12/9

1:20 pm-6:25 am

1 stop11h 05m

London Heathrow

Tue 12/16

6:30 am-5:46 pm

2 stops17h 16m

$590

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/10

Showing 1-10 of 60 results
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Best time to book a flight from Illinois to London

Have a flexible travel schedule? Discover the best time to fly to London from Illinois with our price prediction graph.
Estimated round-trip 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 from Illinois to London

What is the cheapest month to book a flight from Illinois to London?

Currently, May is the cheapest month in which you can book a flight from Illinois to London (average of $399). Flying from Illinois to London in July is currently the most expensive (average of $612). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from IL to LON?

Find hourly flight availability from Illinois to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 10, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 31% on flights from Illinois to London by exploring options for tickets in the evening.

What is the cheapest day to fly from Illinois to London?

Use this chart to determine the cheapest time to fly round-trip from Illinois to London. Price data was last updated on November 10, 2024.

Travelers seeking maximum savings on their Illinois to London flight should consider departing on Tuesday evenings when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Illinois to London

Explore weekly flight availability from Illinois to London. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated November 10, 2025.

The most flights from USIL to LON are scheduled on a Thursday (41 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (37 on average).

Related info for your journey

Find useful and relevant information for your journey from Illinois to London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Illinois to London?

    For as low as $561, Icelandair can have you in London from Illinois in 10h 25m. The distance between Illinois and London is about 3960 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Illinois to London one-way?

    For one-way options, check prices for JetBlue. According to our data, you can fly for as low as $284. Users have also found prices from $403 and $404 on United Airlines and Air Canada, respectively.

  • What are the most popular routes from Illinois to London?

    While some choose either Chicago O'Hare Intl - London Gatwick or Chicago O'Hare Intl - London City, Chicago O'Hare Intl - London Heathrow is the most popular route from Illinois to London.

  • What are the most reliable airlines from Illinois to London?

    No one likes to see their flight delayed. When booking a flight from Illinois to London consider choosing Gulf Air (75%), Malaysia Airlines (72%) or Air Canada (70%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Illinois to London?

    On average you can expect to pay $2,667 for a flight from Illinois to London. The cheapest flight overall is $396 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at $428.

  • Can I find deals for flights from Illinois to London that include hotel bookings?

    Yes. In addition to deals on Illinois to London flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to London?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to London.

  • Can I find deals for business class flights from Illinois to London?

    Yes. Cheapflights offers flight deals from Illinois to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Illinois to London?

    Currently, May is the cheapest month in which you can book a flight from Illinois to London (average of $399). Flying from Illinois to London in July is currently the most expensive (average of $612). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Hounslow
Ilford
Hayes
Southend-on-Sea
Harrow
Croydon
Eastleigh
Dartford
Dover
Winchester
Orpington
Gatwick
Borehamwood
Aylesbury
Bedford
Chipping Norton
Wembley
Folkestone
Eastbourne
Sutton

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Alternative routes for Illinois to London

See prices for flight routes from nearby airports that may be better suited for you.
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Top 10 airlines flying from Illinois to London

Discover the top 10 airlines that operate flights from Illinois to London. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated November 10, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$51Average$625FlexibilityNo cancel feeOn-time62%
SWISSCheapest$257Average$685FlexibilityNo cancel feeOn-time79%
Scandinavian AirlinesCheapest$338Average$569FlexibilityNo cancel feeOn-time77%
DeltaCheapest$345Average$927FlexibilityNo cancel feeOn-timeN/A
TAP AIR PORTUGALCheapest$450Average$644FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$460Average$947FlexibilityNo cancel feeOn-time76%
IcelandairCheapest$481Average$659FlexibilityNo cancel feeOn-time76%
Alaska AirlinesCheapest$487Average$677FlexibilityNo cancel feeOn-time75%
British AirwaysCheapest$502Average$855FlexibilityNo cancel feeOn-time70%
Aer LingusCheapest$515Average$818FlexibilityNo cancel feeOn-timeN/A

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