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Cheap flights from Illinois to London Heathrow Airport from £213

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 9/12. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LHR
26 Dec — 2 Jan1
1 adult
1 adult, Economy, 0 bags

Find flight deals from Illinois to Heathrow

Enter your travel dates to find the best prices.

Cheapest flights from Illinois to Heathrow
Explore the most affordable flight options available from Illinois to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 26 November 2025.

Wed 3/1218:30ORD - LHR
1 stop19h 00mIcelandair
Wed 10/1212:15LHR - ORD
1 stop11h 05mIcelandair
Deal found 24/11£425
Tue 9/1218:30ORD - LHR
1 stop19h 00mIcelandair
Thu 18/1220:35LHR - ORD
1 stop26h 45mIcelandair
Deal found 23/11£426
Thu 11/1218:30ORD - LHR
1 stop10h 20mIcelandair
Thu 18/1220:35LHR - ORD
1 stop26h 45mIcelandair
Deal found 24/11£430
Mon 8/1218:30ORD - LHR
1 stop10h 20mIcelandair
Wed 24/1212:15LHR - ORD
1 stop11h 05mIcelandair
Deal found 23/11£432
Tue 9/1218:30ORD - LHR
1 stop19h 00mIcelandair
Mon 15/1220:35LHR - ORD
1 stop26h 45mIcelandair
Deal found 25/11£433
Mon 1/1218:30ORD - LHR
1 stop10h 20mIcelandair
Mon 8/1220:35LHR - ORD
1 stop26h 45mIcelandair
Deal found 25/11£434
Thu 11/1218:30ORD - LHR
1 stop10h 20mIcelandair
Mon 15/1220:35LHR - ORD
1 stop26h 45mIcelandair
Deal found 25/11£434
Thu 11/1218:30ORD - LHR
1 stop10h 20mIcelandair
Tue 16/1220:35LHR - ORD
1 stop26h 45mIcelandair
Deal found 25/11£435
Tue 9/1218:30ORD - LHR
1 stop19h 00mIcelandair
Tue 16/1220:35LHR - ORD
1 stop26h 45mIcelandair
Deal found 25/11£436
Mon 24/1113:00ORD - LHR
1 stop11h 40mMultiple Airlines
Thu 4/1206:50LHR - ORD
1 stop11h 20mMultiple Airlines
Deal found 23/11£438
Wed 10/1218:30ORD - LHR
1 stop19h 00mIcelandair
Wed 17/1220:35LHR - ORD
1 stop26h 45mIcelandair
Deal found 25/11£440
Wed 31/1211:48MDW - LHR
1 stop13h 17mVirgin Atlantic
Thu 15/108:40LHR - MDW
2 stops15h 52mVirgin Atlantic
Deal found 24/11£475

Cheap flight deals from Illinois to Heathrow

Keep the following information in mind while searching for Illinois to Heathrow flight deals. Data was last updated 26 November 2025.

Round-trip from

£425

One-way from

£213

Popular in

June

Cheapest in

February

Average price

£520

Good round-trip deal

£519 or less

Good one-way deal

£366 or less
Scandinavian Airlines
  • Scandinavian Airlines
  • 12/2-21/2
  • 4 total stops
  • 48h 05m total
  • Illinois to London
Search Deals
9/12
  • 9/12
  • 3 total stops
  • 37h 50m total
  • Illinois to London
Search Deals
Highest demand for flights based on searches. 21% potential increase in price (£119 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£21 potential savings vs. average return 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 Heathrow.
Search Deals
Price to beat on a one-way flight from Illinois to London Heathrow.
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Illinois to Heathrow 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 858,174 searches. Data last updated 26 November 2025.
Use the filters below to find and compare flights from Illinois to London Heathrow Airport that are best for you.

Fly from

Illinois

Fly to

Heathrow

Route

Depart

Return

Price

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 22/4

07:30-09:35

2 stops20h 05m

London Heathrow

Fri 1/5

21:05-16:10

2 stops25h 05m

£429

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 21/4

07:30-09:35

2 stops20h 05m

London Heathrow

Tue 5/5

21:05-16:10

2 stops25h 05m

£437

EvansvilleLondon

EVV - LHR

EVVLHR

Evansville Dress Regional

Thu 8/1

11:40-06:25

1 stop12h 45m

London Heathrow

Thu 15/1

10:00-17:19

2 stops37h 19m

£447

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 28/4

07:00-09:20

2 stops20h 20m

London Heathrow

Sat 2/5

06:40-16:10

2 stops15h 30m

£448

BloomingtonLondon

BMI - LHR

BMILHR

Bloomington-Normal

Wed 4/2

15:35-09:00

1 stop11h 25m

London Heathrow

Sun 8/2

06:30-22:08

2 stops21h 38m

£457

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 9/12

15:45-05:55

Nonstop8h 10m

London Heathrow

Wed 14/1

11:10-18:25

1 stop13h 15m

£463

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 28/4

07:30-09:35

2 stops20h 05m

London Heathrow

Mon 4/5

07:05-16:10

2 stops15h 05m

£465

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Thu 7/5

07:00-09:20

2 stops20h 20m

London Heathrow

Sat 16/5

06:40-16:10

1 stop15h 30m

£466

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 4/2

21:05-11:15

Nonstop8h 10m

London Heathrow

Thu 5/3

11:10-18:25

1 stop13h 15m

£469

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 14/1

15:45-05:55

Nonstop8h 10m

London Heathrow

Wed 21/1

11:10-18:25

1 stop13h 15m

£469

Flights are sorted by cheapest return flights first.

Deals found on 23/11

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

Have a flexible travel schedule? Discover the best time to fly to Heathrow from 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 from Illinois to London Heathrow Airport

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

Currently, May is the cheapest month in which you can book a flight from Illinois to London Heathrow Airport (average of £300). Flying from Illinois to London Heathrow Airport in June is currently the most expensive (average of £689). 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 LHR?

Find hourly flight availability from Illinois to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 26 November 2025.

It’s optimal to fly from Illinois to London Heathrow Airport in the afternoon. By choosing this option you can save up to 34% on the cost of your flight, compared to a flight at midday.

Weekly flight availability from Illinois to London Heathrow Airport

Explore weekly flight availability from Illinois to Heathrow. 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 26 November 2025.

The most flights from USIL to LHR 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).

How much does it cost for a return flight from Illinois to London Heathrow Airport?

Related info for your journey

Find useful and relevant information for your journey from Illinois to Heathrow. 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 Heathrow Airport?

    For as low as £457, Scandinavian Airlines can have you in London Heathrow Airport from Illinois in 11h 25m. The distance from Illinois to London Heathrow Airport is about 4048 mi. This flight may include one or multiple stops.

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

    The cheapest airline one-way is Scandinavian Airlines, with whom users have recently found tickets for as low as £272. However, be on the lookout for offers from Iberia and Delta, as they are both options that can get you from Illinois to London Heathrow Airport for a low price.

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

    The most popular route from Illinois to London Heathrow Airport is Chicago O'Hare Intl - London Heathrow. You may also consider Chicago Midway - London Heathrow or Lambert-St Louis - London Heathrow.

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

    No one likes to see their flight delayed. When booking a flight from Illinois to London Heathrow Airport 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 Heathrow Airport?

    On average you can expect to pay £767 for a flight from Illinois to London Heathrow Airport. The cheapest flight overall is £300 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at £297.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Illinois to Heathrow 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 Heathrow Airport?

    Currently, May is the cheapest month in which you can book a flight from Illinois to London Heathrow Airport (average of £300). Flying from Illinois to London Heathrow Airport in June is currently the most expensive (average of £689). 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

Travelling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Milton Keynes
Slough
Croydon
Hounslow
Northampton
Gatwick
Luton
Ilford
Wembley
Deal
Hayes
Colchester
Watford
Brentford
Winchester
Swindon
Crawley
Romford
Chichester
Bedford

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Alternative routes for Illinois to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
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Top 7 airlines flying from Illinois to Heathrow

Discover the top 7 airlines that operate flights from Illinois to Heathrow. 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 858,174 searches. Data last updated 26 November 2025.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£366Average£526FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
American AirlinesCheapest£394Average£626FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
FinnairCheapest£423Average£690FlexibilityNo cancel feeOn-time76%
Search Finnair flights
British AirwaysCheapest£432Average£587FlexibilityNo cancel feeOn-time70%
Search British Airways flights
IberiaCheapest£456Average£541FlexibilityNo cancel feeOn-time77%
Search Iberia flights
Aer LingusCheapest£459Average£592FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
United AirlinesCheapest£472Average£711FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

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 from Illinois to Heathrow?

When you search for this flight from Illinois to Heathrow, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

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

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Heathrow from Illinois.

Can Cheapflights find flights from Illinois to Heathrow with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Illinois to Heathrow, users can toggle the no change fees filter when performing a flight search.

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

Yes, Cheapflights offers price alerts on Illinois to Heathrow flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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