Latest deals
Insights
FAQs
Reviews
Price Alerts

Cheap flights from Illinois to London from £213

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to London departing on 5/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

Voted winner of Europe's Best Travel App 2023

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Illinois to London

Cheap return flights

Enter your travel dates to find the best prices.
Scandinavian Airlines Logo
19:20 - 09:35ORD-LHR
32h 15m2 stops
Scandinavian Airlines Logo
10:20 - 16:45LHR-ORD
12h 25m1 stop
£426Scandinavian Airlines
Find Deal
Sa, 14 Feb - Mi, 18 Feb
Icelandair Logo
19:25 - 11:55ORD-LHR
10h 30m1 stop
Icelandair Logo
13:05 - 18:15LHR-ORD
11h 10m1 stop
£427Icelandair
Find Deal
Mi, 22 Apr - Mo, 27 Apr
Delta Logo
12:50 - 06:25MDW-LHR
11h 35m1 stop
Delta Logo
06:30 - 16:34LHR-MDW
16h 04m2 stops
£479Delta
Find Deal
Mi, 3 Dez - Mi, 10 Dez
Delta Logo
06:00 - 07:50BMI-LHR
19h 50m1 stop
Delta Logo
08:40 - 22:08LHR-BMI
19h 28m2 stops
£479Delta
Find Deal
Mi, 4 Feb - So, 8 Feb
Lufthansa Logo
13:25 - 05:55PIA-LHR
10h 30m1 stop
Lufthansa Logo
06:30 - 16:40LHR-PIA
15h 10m2 stops
£482Lufthansa
Find Deal
Mi, 4 Mrz - Di, 10 Mrz
Virgin Atlantic Logo
13:49 - 07:05MDW-LHR
11h 16m1 stop
Virgin Atlantic Logo
08:40 - 18:36LHR-MDW
15h 56m2 stops
£484Virgin Atlantic
Find Deal
Mo, 12 Jan - Do, 22 Jan
Virgin Atlantic Logo
11:21 - 11:40MDW-LHR
18h 19m1 stop
Virgin Atlantic Logo
06:30 - 17:29LHR-MDW
16h 59m2 stops
£485Virgin Atlantic
Find Deal
Mi, 14 Jan - Mi, 21 Jan
Lufthansa Logo
17:25 - 15:50PIA-LHR
16h 25m2 stops
Lufthansa Logo
06:30 - 16:40LHR-PIA
15h 10m2 stops
£488Lufthansa
Find Deal
Mi, 4 Mrz - Di, 10 Mrz
KLM Logo
06:00 - 09:00BMI-LHR
21h 00m1 stop
KLM Logo
12:30 - 22:08LHR-BMI
15h 38m1 stop
£500KLM
Find Deal
Mi, 4 Feb - So, 8 Feb
KLM Logo
15:36 - 09:00BMI-LHR
11h 24m1 stop
KLM Logo
12:30 - 22:08LHR-BMI
15h 38m1 stop
£500KLM
Find Deal
Do, 12 Feb - Di, 17 Feb

Lufthansa flights from Illinois to London Heathrow Airport

Our best Lufthansa deals on Illinois to London Heathrow Airport flight tickets
Lufthansa
1 Dec
ORD21:50Chicago O'Hare Intl
15h 45m
1 stop
LHR19:35London Heathrow
24 Dec
LHR11:10London Heathrow
13h 15m
1 stop
ORD18:25Chicago O'Hare Intl
£438
Find similar
Lufthansa
1 Dec
ORD21:50Chicago O'Hare Intl
15h 45m
1 stop
LHR19:35London Heathrow
24 Dec
LHR11:10London Heathrow
13h 15m
1 stop
ORD18:25Chicago O'Hare Intl
£439
Find similar
Lufthansa
24 Nov
ORD21:50Chicago O'Hare Intl
12h 00m
1 stop
LHR15:50London Heathrow
5 Dec
LHR08:30London Heathrow
17h 35m
1 stop
ORD20:05Chicago O'Hare Intl
£455
Find similar

TAP AIR PORTUGAL flights from Illinois to London Heathrow Airport

Our best TAP AIR PORTUGAL deals on Illinois to London Heathrow Airport flight tickets
TAP AIR PORTUGAL
30 Nov
ORD20:25Chicago O'Hare Intl
20h 15m
1 stop
LHR22:40London Heathrow
10 Dec
LHR06:00London Heathrow
15h 00m
1 stop
ORD15:00Chicago O'Hare Intl
£432
Find similar
TAP AIR PORTUGAL
3 Dec
ORD19:10Chicago O'Hare Intl
14h 20m
1 stop
LHR15:30London Heathrow
14 Dec
LHR06:00London Heathrow
14h 45m
1 stop
ORD14:45Chicago O'Hare Intl
£441
Find similar
TAP AIR PORTUGAL
30 Nov
ORD20:25Chicago O'Hare Intl
15h 05m
1 stop
LHR17:30London Heathrow
25 Dec
LHR18:30London Heathrow
26h 55m
1 stop
ORD15:25Chicago O'Hare Intl
£442
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from Illinois to London Heathrow Airport 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, momondo users made 279,928 searches. Data last updated 21 November 2025.
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

Sa 14/2

19:20-09:35

2 stops32h 15m

London Heathrow

Mi 18/2

10:20-16:45

1 stop12h 25m

£426

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mi 22/4

19:25-11:55

1 stop10h 30m

London Heathrow

Mo 27/4

13:05-18:15

1 stop11h 10m

£427

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Mi 3/12

12:50-06:25

1 stop11h 35m

London Heathrow

Mi 10/12

06:30-16:34

2 stops16h 04m

£479

BloomingtonLondon

BMI - LHR

BMILHR

Bloomington-Normal

Mi 4/2

06:00-07:50

1 stop19h 50m

London Heathrow

So 8/2

08:40-22:08

2 stops19h 28m

£479

PeoriaLondon

PIA - LHR

PIALHR

Greater Peoria

Mi 4/3

13:25-05:55

1 stop10h 30m

London Heathrow

Di 10/3

06:30-16:40

2 stops15h 10m

£482

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Mo 12/1

13:49-07:05

1 stop11h 16m

London Heathrow

Do 22/1

08:40-18:36

2 stops15h 56m

£484

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Mi 14/1

11:21-11:40

1 stop18h 19m

London Heathrow

Mi 21/1

06:30-17:29

2 stops16h 59m

£485

PeoriaLondon

PIA - LHR

PIALHR

Greater Peoria

Mi 4/3

17:25-15:50

2 stops16h 25m

London Heathrow

Di 10/3

06:30-16:40

2 stops15h 10m

£488

BloomingtonLondon

BMI - LHR

BMILHR

Bloomington-Normal

Mi 4/2

06:00-09:00

1 stop21h 00m

London Heathrow

So 8/2

12:30-22:08

1 stop15h 38m

£500

BloomingtonLondon

BMI - LHR

BMILHR

Bloomington-Normal

Do 12/2

15:36-09:00

1 stop11h 24m

London Heathrow

Di 17/2

12:30-22:08

1 stop15h 38m

£500

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to London from

How to get the cheapest flight ticket from Illinois to London Heathrow Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

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

In general, October is the cheapest month to fly from Illinois to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £496. The month of February is another great option to travel to London Heathrow Airport, with average flight prices from Illinois averaging around £513.

What is the cheapest day to depart on your flight to London Heathrow Airport?

On average, the least expensive day to fly to London Heathrow Airport from Illinois is on a Sunday. momondo users have found tickets for Sunday departures for as low as £523. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Saturday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Saturday is £716.

What is the cheapest time of day to depart on your flight to London Heathrow Airport?

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the afternoon. momondo users have found flights departing from Illinois to London Heathrow Airport in the afternoon for as low as £576. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying at midday when prices are £590 on average. Flights to London Heathrow Airport from Illinois at midday are generally more expensive because this time of day is more convenient for travellers’ schedules.

What is the cheapest Illinois to London Heathrow flight route?

Fly from Chicago O'Hare Intl to London Heathrow for the best Illinois - London Heathrow flight prices

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

You are more likely to see cheaper flights to London Heathrow Airport from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around £608 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from Illinois for as low as £536 on momondo.

What cabin class options are available on Illinois to London Heathrow flights?

There are 4 cabin classes available to choose from on Illinois to London Heathrow flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Illinois to London Heathrow Airport flights?

No. A direct flight is the cheapest option for a flight between Illinois to London Heathrow Airport.

Cheap Illinois to London Heathrow Airport flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to London Heathrow Airport

Best price found

£305

Fastest flight time

7h 40m

Direct flights

Every day
The best one-way flight to London Heathrow Airport from Illinois in the past 72 hours is £305. The best return flight deal from Illinois to London Heathrow Airport found on momondo in the last 72 hours is £501.
The fastest flight from Illinois to London Heathrow Airport takes 7h 40m
Direct flights go from Illinois to London Heathrow Airport every day.
Search flight deals

  • When did momondo last update prices for flights from Illinois to London Heathrow Airport?

    Prices for flights from Illinois to London Heathrow Airport refresh daily.

  • How many operators does momondo search for flights from Illinois to London Heathrow Airport?

  • How old do you have to be to fly from Illinois to London Heathrow Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Illinois to London Heathrow Airport.

  • What documentation or ID do you need to fly to London Heathrow Airport?

    The travel and health documents required for your trip to London Heathrow Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at London Heathrow Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from Illinois to London Heathrow Airport?

Best airlines flying from Illinois to London Heathrow Airport

Compare and see reviews for airlines that fly from Illinois to London Heathrow Airport with momondo
Airline
Rating
Free Cancellation
Price
LufthansaPriceFrom £368Free CancellationRating
6.8
7,579 reviews
Search Lufthansa flights
American AirlinesPriceFrom £396Free CancellationRating
7.2
11,047 reviews
Search American Airlines flights
FinnairPriceFrom £425Free CancellationRating
7.6
1,334 reviews
Search Finnair flights
IberiaPriceFrom £458Free CancellationRating
7.0
3,031 reviews
Search Iberia flights
Aer LingusPriceFrom £462Free CancellationRating
7.2
1,377 reviews
Search Aer Lingus flights
British AirwaysPriceFrom £462Free CancellationRating
6.7
7,534 reviews
Search British Airways flights
United AirlinesPriceFrom £475Free CancellationRating
7.4
9,030 reviews
Search United Airlines flights

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Eastbourne
Milton Keynes
Luton
Gatwick
Maidstone
Slough
Northampton
Swindon
Canterbury
Stratford-upon-Avon
Southend-on-Sea
Ipswich
Ilford
Poole
Guildford
Swanage
Dover
Colchester
Chelmsford
Hayes

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to London?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Illinois to London for you.

Can I find flights from Illinois to London with flexible booking policies on momondo?

All flight searches from Illinois to London on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Illinois to London?

Once you have performed a search for Illinois to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Illinois to London right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Illinois to London now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to London and let you know when they change.

An easier way to manage your London Heathrow Airport trip

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
So 21/12
So 28/12
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to London