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

The cheapest airline one-way is Icelandair, with whom users have recently found tickets for as low as £256. However, be on the lookout for offers from JetBlue and Air Canada, as they are both options that can get you from Illinois to London Heathrow Airport for a low price.

In terms of precipitation, rainfall in London Heathrow Airport ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London Heathrow Airport when rainfall is around 40.0 mm.

If weather is an important factor for your trip to London Heathrow Airport, 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 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

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 cheapest flights from Illinois to London Heathrow Airport?

On average you can expect to pay £1,760 for a flight from Illinois to London Heathrow Airport. The cheapest flight overall is £288 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at £317.

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 Royal Jordanian (70%), Air Canada (67%) or Austrian Airlines (67%) as they are the most reliable in getting you off to your destination on time.

What are the most popular airlines that fly from Illinois to London Heathrow Airport?

Consider American Airlines, Finnair or British Airways when booking your flight. These represent the most popular airlines when flying from Illinois to London Heathrow Airport.

How far in advance should I book a flight from Illinois to London Heathrow Airport?

To save on the cost of your flight from Illinois to London Heathrow Airport, book at least 60 days before your planned departure. Booking around this time can save you about 9% on the cost of this flight compared to booking a flight leaving this week. We have found prices from £524 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as £524.

What is the cheapest month to fly from Illinois to London Heathrow Airport?

February is one of the best times of the year to fly to London Heathrow Airport from Illinois. Prices for February average £571 per person but you can even find prices for as low as £351. The most expensive prices can be found in the month of June. Opting for a February flight can save you 48% on your journey compared to booking in June

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.

£206+ Flights from Illinois to London Heathrow Airport

Cheap flight deals from Illinois to Heathrow

Round-trip from	£446
One-way from	£206
Popular in	June
Cheapest in	February
Average price	£774
Good round-trip deal	£516 or less
Good one-way deal	£320 or less

British Airways
26/9-6/10
Nonstop
16h 25m total
Illinois to London

Search Deals

18/8
3 total stops
34h 00m total
Illinois to London

Search Deals

Highest demand for flights based on searches. 21% potential increase in price (£114 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease (£20 potential savings vs. average return price).

Search Deals

Average for round-trip flights in July 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

Find flight deals from Illinois to Heathrow

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 15 July 2025.

Sat 4/1019:15ORD - LHR

2 stops17h 35mScandinavian Airlines

Thu 16/1010:20LHR - ORD

1 stop11h 50mScandinavian Airlines

Deal found 15/7£452

Tue 16/913:59ORD - LHR

1 stop10h 31mBritish Airways

Fri 26/914:25LHR - ORD

Nonstop8h 35mBritish Airways

Deal found 14/7£455

Sun 3/822:30ORD - LHR

Nonstop7h 45mFinnair

Tue 12/814:25LHR - ORD

Nonstop8h 35mFinnair

Deal found 14/7£455

Sun 31/821:25ORD - LHR

Nonstop8h 20mUnited Airlines

Wed 10/911:05LHR - ORD

Nonstop9h 05mUnited Airlines

Deal found 14/7£457

Thu 30/1013:00MDW - LHR

2 stops13h 40mDelta

Thu 6/1108:40LHR - MDW

2 stops15h 27mDelta

Deal found 14/7£457

Tue 19/818:39PIA - LHR

1 stop9h 51mBritish Airways

Tue 26/806:10LHR - PIA

2 stops17h 59mBritish Airways

Deal found 13/7£458

Tue 5/814:30ORD - LHR

1 stop14h 00mIberia

Fri 15/812:15LHR - ORD

Nonstop8h 25mIberia

Deal found 15/7£459

Mon 15/910:35MDW - LHR

1 stop14h 10mVirgin Atlantic

Thu 25/906:15LHR - MDW

2 stops18h 20mVirgin Atlantic

Deal found 15/7£461

Fri 8/807:00ORD - LHR

1 stop17h 25mDelta

Mon 18/806:30LHR - ORD

1 stop13h 40mDelta

Deal found 14/7£463

Sun 3/818:47MDW - LHR

1 stop12h 43mAir France

Tue 12/813:05LHR - MDW

1 stop14h 39mAir France

Deal found 14/7£463

Sun 10/806:30MLI - LHR

2 stops18h 00mUnited Airlines

Tue 30/914:05LHR - MLI

2 stops31h 00mUnited Airlines

Deal found 14/7£468

Tue 19/817:19PIA - LHR

2 stops31h 11mUnited Airlines

Tue 26/809:30LHR - PIA

2 stops30h 43mUnited Airlines

Deal found 14/7£468

Best flights from Illinois to Heathrow
Discover carefully curated flight deals from Illinois to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 15 July 2025.

Fri 26/922:35ORD - LHR

Nonstop7h 40mBritish Airways

Mon 6/1013:10LHR - ORD

Nonstop8h 45mBritish Airways

Deal found 15/7£446

Mon 20/1019:15ORD - LHR

1 stop16h 25mScandinavian Airlines

Fri 24/1018:40LHR - ORD

1 stop27h 30mScandinavian Airlines

Deal found 15/7£449

Sat 2/818:15ORD - LHR

1 stop15h 20mTAP AIR PORTUGAL

Mon 25/808:00LHR - ORD

1 stop14h 40mTAP AIR PORTUGAL

Deal found 15/7£454

Sun 3/822:30ORD - LHR

Nonstop7h 45mFinnair

Tue 12/814:25LHR - ORD

Nonstop8h 35mFinnair

Deal found 14/7£455

Sun 31/821:25ORD - LHR

Nonstop8h 20mUnited Airlines

Tue 9/908:30LHR - ORD

Nonstop9h 00mUnited Airlines

Deal found 14/7£457

Thu 30/1013:00MDW - LHR

2 stops13h 40mDelta

Thu 6/1108:40LHR - MDW

2 stops15h 27mDelta

Deal found 14/7£457

Tue 5/814:30ORD - LHR

1 stop14h 00mIberia

Fri 15/812:15LHR - ORD

Nonstop8h 25mIberia

Deal found 15/7£459

Mon 15/910:35MDW - LHR

1 stop14h 10mVirgin Atlantic

Thu 25/906:15LHR - MDW

2 stops18h 20mVirgin Atlantic

Deal found 15/7£461

Sat 6/913:30ORD - LHR

1 stop11h 15mKLM

Sun 5/1008:40LHR - ORD

1 stop11h 30mKLM

Deal found 13/7£463

Sun 3/818:47MDW - LHR

1 stop12h 43mAir France

Tue 12/813:05LHR - MDW

1 stop14h 39mAir France

Deal found 14/7£463

Tue 2/908:40ORD - LHR

1 stop15h 50mAir Canada

Fri 12/906:00LHR - ORD

2 stops17h 33mAir Canada

Deal found 13/7£470

Tue 5/819:25ORD - LHR

1 stop10h 30mIcelandair

Sat 30/813:05LHR - ORD

1 stop14h 10mIcelandair

Deal found 14/7£477

Direct flights from Illinois to Heathrow
Explore direct flight options from Illinois to Heathrow based on user searches, and compare prices and availability for your desired travel dates. Data last updated 15 July 2025.

Fri 26/922:35ORD - LHR

Nonstop7h 40mBritish Airways

Mon 6/1013:10LHR - ORD

Nonstop8h 45mBritish Airways

Deal found 15/7£446

Mon 28/720:15ORD - LHR

Nonstop8h 05mIberia

Fri 15/809:15LHR - ORD

Nonstop8h 40mIberia

Deal found 14/7£452

Sun 3/820:15ORD - LHR

Nonstop8h 05mFinnair

Tue 12/814:25LHR - ORD

Nonstop8h 35mFinnair

Deal found 14/7£455

Sun 31/821:25ORD - LHR

Nonstop8h 20mUnited Airlines

Wed 10/911:05LHR - ORD

Nonstop9h 05mUnited Airlines

Deal found 14/7£457

Thu 14/821:15ORD - LHR

Nonstop7h 50mAmerican Airlines

Wed 20/815:30LHR - ORD

Nonstop8h 45mAmerican Airlines

Deal found 15/7£471

Wed 27/818:05ORD - LHR

Nonstop8h 15mLufthansa

Wed 3/911:05LHR - ORD

Nonstop9h 05mLufthansa

Deal found 13/7£475

Last-minute flights from Illinois to Heathrow
Discover last-minute flight deals from Illinois to Heathrow. Data last updated 15 July 2025 and is based on user searches.

Sun 20/722:30ORD - LHR

Nonstop7h 45mBritish Airways

Wed 20/808:25LHR - ORD

1 stop13h 20mBritish Airways

Deal found 14/7£453

Sun 20/716:36ORD - LHR

1 stop10h 34mAmerican Airlines

Wed 20/808:25LHR - ORD

1 stop13h 20mAmerican Airlines

Deal found 14/7£461

Sun 20/708:40ORD - LHR

1 stop15h 50mMultiple Airlines

Mon 25/820:05LHR - ORD

1 stop25h 50mMultiple Airlines

Deal found 13/7£463

Mon 21/719:05ORD - LHR

1 stop15h 20mSWISS

Mon 11/814:10LHR - ORD

Nonstop9h 10mSWISS

Deal found 13/7£515

Tue 22/710:40ORD - LHR

1 stop13h 50mAir Canada

Wed 1/1009:30LHR - ORD

2 stops15h 24mAir Canada

Deal found 15/7£480

Wed 23/713:16STL - LHR

1 stop15h 14mBritish Airways

Wed 30/720:55LHR - STL

2 stops29h 29mBritish Airways

Deal found 13/7£498

Wed 23/713:16STL - LHR

1 stop12h 39mIberia

Wed 30/708:55LHR - STL

1 stop30h 34mIberia

Deal found 13/7£519

Wed 23/721:15ORD - LHR

1 stop10h 40mAer Lingus

Fri 15/813:25LHR - ORD

1 stop11h 35mAer Lingus

Deal found 15/7£530

Wed 23/712:06ORD - LHR

1 stop15h 24mJetBlue

Tue 5/811:55LHR - ORD

1 stop16h 33mJetBlue

Deal found 13/7£548

Thu 24/716:05ORD - LHR

Nonstop8h 15mUnited Airlines

Mon 11/808:30LHR - ORD

Nonstop8h 55mUnited Airlines

Deal found 13/7£510

Fri 25/717:40ORD - LHR

Nonstop7h 40mIberia

Sat 30/809:15LHR - ORD

Nonstop8h 40mIberia

Deal found 15/7£458

Fri 25/709:50ORD - LHR

1 stop15h 25mDelta

Sat 30/811:45LHR - ORD

2 stops15h 50mDelta

Deal found 15/7£469

One-way flights from Illinois to Heathrow
Search for one-way flight options from Illinois to Heathrow. Find affordable one-way fares based on user searches. Data last updated 15 July 2025.

Mon 18/814:30STL - LHR

3 stops34h 00mMultiple Airlines

Deal found 14/7£206

Sun 3/818:00ORD - LHR

2 stops20h 05mMultiple Airlines

Deal found 14/7£251

Wed 17/919:25ORD - LHR

1 stop10h 30mIcelandair

Deal found 13/7£256

Tue 14/1013:36ORD - LHR

1 stop13h 54mJetBlue

Deal found 15/7£262

Fri 9/120:20ORD - LHR

3 stops28h 50mAir Canada

Deal found 14/7£267

Fri 28/1119:20ORD - LHR

2 stops17h 10mScandinavian Airlines

Deal found 14/7£271

Tue 30/913:53STL - LHR

1 stop11h 27mIberia

Deal found 13/7£274

Wed 13/813:30STL - LHR

1 stop14h 30mAir Canada

Deal found 14/7£276

Wed 10/920:40ORD - LHR

Nonstop7h 50mBritish Airways

Deal found 13/7£277

Mon 15/909:15MDW - LHR

2 stops15h 15mMultiple Airlines

Deal found 14/7£277

Sun 27/720:15ORD - LHR

Nonstop8h 05mIberia

Deal found 13/7£286

Mon 11/810:31MDW - LHR

1 stop14h 14mVirgin Atlantic

Deal found 15/7£287

Cheapflights Fare Finder

Use the filters below to find and compare flights from Illinois to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 26/9

22:35-12:15

Nonstop7h 40m

London Heathrow

Mon 6/10

13:10-15:55

Nonstop8h 45m

£446

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 20/10

19:15-17:40

1 stop16h 25m

London Heathrow

Fri 24/10

18:40-16:10

1 stop27h 30m

£449

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sat 2/8

18:15-15:35

1 stop15h 20m

London Heathrow

Sun 24/8

08:00-16:15

1 stop14h 15m

£454

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 3/8

22:30-12:15

Nonstop7h 45m

London Heathrow

Tue 12/8

14:25-17:00

Nonstop8h 35m

£455

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 31/8

21:25-11:45

Nonstop8h 20m

London Heathrow

Tue 9/9

08:30-11:30

Nonstop9h 00m

£457

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Thu 30/10

13:00-07:40

2 stops13h 40m

London Heathrow

Thu 6/11

08:40-18:07

2 stops15h 27m

£457

PeoriaLondon

PIA - LHR

PIALHR

Greater Peoria

Tue 19/8

18:39-10:30

1 stop9h 51m

London Heathrow

Tue 26/8

06:10-18:09

2 stops17h 59m

£458

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 5/8

14:30-10:30

1 stop14h 00m

London Heathrow

Fri 15/8

12:15-14:40

Nonstop8h 25m

£459

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Mon 15/9

10:35-06:45

1 stop14h 10m

London Heathrow

Thu 25/9

06:15-18:35

2 stops18h 20m

£461

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sat 6/9

13:30-06:45

1 stop11h 15m

London Heathrow

Sun 5/10

08:40-14:10

1 stop11h 30m

£463

Flights are sorted by cheapest return flights first.

Deals found on 14/7

Showing 1-10 of 59 results

...

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, January is the cheapest month in which you can book a flight from Illinois to London Heathrow Airport (average of £112). Flying from Illinois to London Heathrow Airport in August is currently the most expensive (average of £164). 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?

When flying from Illinois to London Heathrow Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Illinois to London Heathrow Airport

The most flights from USIL to LHR are scheduled on a Monday (57 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (51 on average).

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

Reviews of airlines servicing Heathrow

Read through reviews of airlines operating flights from Illinois to London Heathrow Airport, such as Delta, KLM, andAustrian Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very Good

7,956 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Delta

8.0

Very Good

7,956 reviews

Delta

8.0

Very Good

7,956 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

KLM

7.8

Good

1,372 reviews

Delta

8.0

Very Good

7,956 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Austrian Airlines

7.6

Good

814 reviews

Delta

8.0

Very Good

7,956 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Finnair

7.6

Good

1,316 reviews

Delta

8.0

Very Good

7,956 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Air France

7.5

Good

1,466 reviews

Delta

8.0

Very Good

7,956 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

What are the cheapest airlines to fly from Illinois to London Heathrow Airport one-way?
The cheapest airline one-way is Icelandair, with whom users have recently found tickets for as low as £256. However, be on the lookout for offers from JetBlue and Air Canada, 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 Royal Jordanian (70%), Air Canada (67%) or Austrian Airlines (67%) 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 £1,760 for a flight from Illinois to London Heathrow Airport. The cheapest flight overall is £288 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at £317.
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, January is the cheapest month in which you can book a flight from Illinois to London Heathrow Airport (average of £112). Flying from Illinois to London Heathrow Airport in August is currently the most expensive (average of £164). 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

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Top 7 airlines flying from Illinois to Heathrow

Airline	Cheapest	Average	Flexibility	On-time
Aer Lingus	Cheapest£410	Average£578	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
Finnair	Cheapest£413	Average£600	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
Iberia	Cheapest£445	Average£568	FlexibilityNo cancel fee	On-time77%	Search Iberia flights
United Airlines	Cheapest£461	Average£700	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
British Airways	Cheapest£463	Average£643	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Lufthansa	Cheapest£483	Average£805	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
American Airlines	Cheapest£512	Average£632	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights

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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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Cheap flights from Illinois to London Heathrow Airport from £206

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 18/8. Fares are subject to change and may not be available on all flights or dates of travel.

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 15 July 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Illinois to Heathrow

Cheapest flights from Illinois to HeathrowExplore 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 15 July 2025.

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 15 July 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Illinois to London Heathrow Airport that are best for you.

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.

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?

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 15 July 2025.

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 15 July 2025.

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

Reviews of airlines servicing Heathrow

Read through reviews of airlines operating flights from Illinois to London Heathrow Airport, such as Delta, KLM, andAustrian Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

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.

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

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

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

What are the cheapest flights from Illinois to London Heathrow Airport?

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

How can I find direct flights from Illinois to Heathrow?

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

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

Travelling to a place near London Heathrow Airport?

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.

Alternative routes for Illinois to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.

Top 7 airlines flying from Illinois to Heathrow

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.

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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 15 July 2025.