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$280+ 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 12/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LON
dic. 26 — ene. 21
vie. 12/26
vie. 1/2
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 noviembre 26, 2025.

This oojo deal was found by Cheapflights users on 11/24. 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.
mié. 12/36:30 pmORD - LHR
1 stop19h 00mIcelandair
mié. 12/1012:15 pmLHR - ORD
1 stop11h 05mIcelandair
Deal found 11/24$559
This Mytrip deal was found by Cheapflights users on 11/26. 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.
mié. 12/103:50 pmORD - LGW
1 stop12h 10mMultiple Airlines
mié. 12/178:50 amLGW - ORD
1 stop15h 05mMultiple Airlines
Deal found 11/26$559
This Ticket deal was found by Cheapflights users on 11/24. 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 11/308:25 pmORD - LGW
1 stop13h 20mTAP AIR PORTUGAL
mar. 12/94:35 pmLGW - ORD
1 stop28h 25mTAP AIR PORTUGAL
Deal found 11/24$561
This Cheapflightsfares deal was found by Cheapflights users on 11/26. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 12/16:30 pmORD - LGW
1 stop10h 25mIcelandair
mar. 12/911:55 amLGW - ORD
1 stop11h 25mIcelandair
Deal found 11/26$562
This Mytrip deal was found by Cheapflights users on 11/26. 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.
mié. 12/33:50 pmORD - STN
1 stop10h 00mMultiple Airlines
mié. 12/106:30 amSTN - ORD
1 stop17h 25mMultiple Airlines
Deal found 11/26$564
This FlightHub deal was found by Cheapflights users on 11/24. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/116:30 pmORD - LHR
1 stop10h 20mIcelandair
jue. 12/188:35 pmLHR - ORD
1 stop26h 45mIcelandair
Deal found 11/24$565
This Mytrip deal was found by Cheapflights users on 11/24. 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.
dom. 11/306:50 pmORD - STN
2 stops22h 35mMultiple Airlines
mié. 12/36:50 amSTN - ORD
2 stops19h 15mMultiple Airlines
Deal found 11/24$566
This Kiwi.com deal was found by Cheapflights users on 11/25. 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.
mar. 12/96:30 pmORD - LHR
1 stop19h 00mIcelandair
lun. 12/158:35 pmLHR - ORD
1 stop26h 45mIcelandair
Deal found 11/25$569
This Cheapflightsfares deal was found by Cheapflights users on 11/25. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/306:30 pmORD - LGW
1 stop10h 25mIcelandair
sáb. 1/3111:55 amLGW - ORD
1 stop11h 25mIcelandair
Deal found 11/25$569
This oojo deal was found by Cheapflights users on 11/26. 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.
lun. 12/16:30 pmORD - LHR
1 stop10h 20mIcelandair
lun. 12/88:35 pmLHR - ORD
1 stop26h 45mIcelandair
Deal found 11/26$570
This FlightHub deal was found by Cheapflights users on 11/26. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 11/288:15 pmORD - LGW
1 stop31h 35mTAP AIR PORTUGAL
sáb. 12/64:35 pmLGW - ORD
1 stop28h 10mTAP AIR PORTUGAL
Deal found 11/26$570
This Kiwi.com deal was found by Cheapflights users on 11/25. 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.
jue. 12/116:30 pmORD - LHR
1 stop10h 20mIcelandair
lun. 12/158:35 pmLHR - ORD
1 stop26h 45mIcelandair
Deal found 11/25$571

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 noviembre 26, 2025.

Most accurate provider

Justfly.com
3 stars

Most trusted provider

Justfly.com
3 stars

Round-trip from

$558
(oojo)

One-way from

$280
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$683

Good round-trip deal

$694 or less

Good one-way deal

$451 or less
Provider with most accurate pricing for Chicago (CHI)-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-London (LON) flights.
Search Deals
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 ($206 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
Search Deals
Price to beat on a round-trip flight from Illinois to London (LON).
Search Deals
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 noviembre 26, 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 - LTN

ORDLTN

Chicago O'Hare Intl

mié. 1/28

6:30 pm-12:55 pm

1 stop12h 25m

London Luton

mar. 2/3

7:00 am-5:20 pm

1 stop16h 20m

$562

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

mié. 4/22

7:30 am-9:35 am

2 stops20h 05m

London Heathrow

vie. 5/1

9:05 pm-4:10 pm

2 stops25h 05m

$564

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

mié. 1/28

7:10 pm-3:05 pm

1 stop13h 55m

London Gatwick

vie. 2/6

9:25 pm-2:45 pm

2 stops47h 20m

$568

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

mié. 3/25

6:10 pm-6:55 am

Nonstop7h 45m

London Heathrow

mié. 4/1

7:30 am-5:50 pm

1 stop16h 20m

$576

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

vie. 1/9

7:20 pm-11:25 pm

2 stops22h 05m

London Stansted

dom. 1/18

6:45 pm-4:45 pm

2 stops28h 00m

$578

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

lun. 1/19

7:20 pm-3:45 pm

1 stop14h 25m

London Stansted

vie. 1/23

8:20 am-4:45 pm

1 stop14h 25m

$579

ChicagoLondon

ORD - LTN

ORDLTN

Chicago O'Hare Intl

dom. 1/11

6:30 pm-4:45 pm

2 stops16h 15m

London Luton

sáb. 1/17

6:00 am-5:20 pm

2 stops17h 20m

$582

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

jue. 3/12

7:00 am-9:20 am

2 stops21h 20m

London Heathrow

mié. 3/18

6:40 am-5:45 pm

1 stop16h 05m

$597

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

dom. 3/29

8:40 pm-1:10 pm

1 stop10h 30m

London Heathrow

mié. 4/8

8:40 am-2:15 pm

1 stop11h 35m

$603

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

mié. 2/4

9:05 pm-11:15 am

Nonstop8h 10m

London Heathrow

jue. 3/5

11:10 am-6:25 pm

1 stop13h 15m

$617

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/24

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 $394). Flying from Illinois to London in July is currently the most expensive (average of $607). 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 noviembre 26, 2025.

Unlike in the morning, 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 18, 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 noviembre 26, 2025.

The most flights from USIL to LON are scheduled on a Monday (47 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (30 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 $576, Scandinavian Airlines can have you in London from Illinois in 7h 45m. The distance between Illinois and London is about 3939 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 Scandinavian Airlines. According to our data, you can fly for as low as $357. Users have also found prices from $359 and $368 on JetBlue and TAP AIR PORTUGAL, 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 (70%), Malaysia Airlines (66%) or SriLankan Airlines (65%) 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 $436.

  • 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 $394). Flying from Illinois to London in July is currently the most expensive (average of $607). 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
Ilford
Hounslow
Hayes
Southend-on-Sea
Harrow
Eastleigh
Dartford
Dover
Winchester
Croydon
Orpington
Watford
Borehamwood
Aylesbury
Chipping Norton
Wembley
Folkestone
Eastbourne
Sutton
Milton Keynes

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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 noviembre 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$51Average$625FlexibilityNo cancel feeOn-time62%
SWISSCheapest$257Average$684FlexibilityNo cancel feeOn-time79%
Scandinavian AirlinesCheapest$338Average$564FlexibilityNo cancel feeOn-time77%
DeltaCheapest$345Average$927FlexibilityNo cancel feeOn-timeN/A
TAP AIR PORTUGALCheapest$450Average$641FlexibilityNo cancel feeOn-timeN/A
LufthansaCheapest$460Average$948FlexibilityNo cancel feeOn-time76%
IcelandairCheapest$481Average$659FlexibilityNo cancel feeOn-time76%
British AirwaysCheapest$502Average$856FlexibilityNo cancel feeOn-time70%
Aer LingusCheapest$517Average$810FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$522Average$919FlexibilityNo cancel feeOn-time75%

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