Cheap flights from Illinois to London from $210
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 10/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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1 adult
Economy
0 bags
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Cheap round-trip flights
These are some of the best round-trip flight deals from Illinois to London that have been recently found on momondo from popular airlines, departing in the coming months.
Cheap one-way flights
Flying one-way? These are some of the best deals recently discovered on momondo for flights from Illinois to London.
Cheap last minute flights
Planning a quick getaway from Illinois to London? These are the last-minute flight deals available now.
Cheap direct flights
If you prefer a non-stop journey, check out our latest direct flight deals to London, so you can enjoy a seamless trip without layovers.
Icelandair flights from Illinois to London Heathrow Airport
Our best Icelandair deals on Illinois to London Heathrow Airport flight tickets
Icelandair![Icelandair]()
Sep 25![Icelandair]()
Oct 7
ORD7:25 pmChicago O'Hare Intl
18h 55m
1 stop
LHR8:20 pmLondon Heathrow
LHR1:05 pmLondon Heathrow
11h 10m
1 stop
ORD6:15 pmChicago O'Hare Intl
Icelandair![Icelandair]()
Oct 9![Icelandair]()
Oct 13
ORD7:25 pmChicago O'Hare Intl
18h 55m
1 stop
LHR8:20 pmLondon Heathrow
LHR9:25 pmLondon Heathrow
26h 50m
1 stop
ORD6:15 pmChicago O'Hare Intl
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![TAP AIR PORTUGAL]()
Sep 15![TAP AIR PORTUGAL]()
Sep 20
ORD6:10 pmChicago O'Hare Intl
18h 40m
1 stop
LHR6:50 pmLondon Heathrow
LHR6:00 amLondon Heathrow
16h 30m
1 stop
ORD4:30 pmChicago O'Hare Intl
TAP AIR PORTUGAL![TAP AIR PORTUGAL]()
Oct 19![TAP AIR PORTUGAL]()
Oct 22
ORD6:00 pmChicago O'Hare Intl
17h 45m
1 stop
LHR5:45 pmLondon Heathrow
LHR1:45 pmLondon Heathrow
28h 50m
1 stop
ORD12:35 pmChicago O'Hare Intl
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
Prices
Airlines
Other information
What is the cheapest month to fly to London Heathrow Airport?
The month of November is, on average, the cheapest month to fly to London Heathrow Airport from Illinois, with most prices found around $663. If you’re not able to fly to London Heathrow Airport in November, then January is your next best option. Flight prices from Illinois to London Heathrow Airport during January average around $669.
What is the cheapest day to depart on your flight to London Heathrow Airport?
Our data shows that Wednesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $772. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $885.
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 morning. momondo users have found flights departing from Illinois to London Heathrow Airport in the morning for as low as $728. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the evening are often more expensive with an average ticket price of $836.
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 3 weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around $786 when searching 3 weeks out.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 $709 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.
What is the cheapest airline that flies from Illinois to London Heathrow?
Icelandair, TAP AIR PORTUGAL, and JetBlue are the most popular carriers operating from Illinois to London Heathrow
What airlines fly to London Heathrow Airport?
British Airways, Iberia and American Airlines are the top three most popular airlines that fly to London Heathrow Airport from Illinois according to our data. British Airways is the first choice among our users, with 40% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 15 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.
How many flights depart from Illinois to London Heathrow Airport on average per day?
As of May 2025, there are 42 flights per day flying from Illinois to London Heathrow Airport. The most common time of day flights depart is 9:00PM, with 65% of flights taking off in the evening.
How many flights depart from Illinois to London Heathrow Airport on average per week?
294 flights are operational weekly from Illinois to London Heathrow Airport as of May 2025. The most popular departure day for this route is Fri, with 19% of flights per week taking off on this day.
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
When did momondo last update prices for flights from Illinois to London Heathrow Airport?
Prices for flights from Illinois to London Heathrow Airport were last updated today.
How many operators does momondo search for flights from Illinois to London Heathrow Airport?
As of May 2025, there are 17 operators available to choose from 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 for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for 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 you'll need for your trip to London Heathrow Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at London Heathrow Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Illinois to London Heathrow Airport?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Illinois to London Heathrow Airport is Boeing 787-9 Dreamliner (42.24% of total bookings). The next most popular plane models are Boeing 787-10 Dreamliner (19.60%), Boeing 777 (17.55%), and Boeing 767-300 (8.43%).
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 | ||
|---|---|---|---|---|---|
| PriceFrom $257 | Free Cancellation | Rating 7.5 1,589 reviews | |||
| PriceFrom $381 | Free Cancellation | Rating 7.3 1,349 reviews | |||
| PriceFrom $460 | Free Cancellation | Rating 6.7 7,054 reviews | |||
| PriceFrom $468 | Free Cancellation | Rating 7.0 488 reviews | |||
| PriceFrom $506 | Free Cancellation | Rating 7.1 1,855 reviews | |||
| PriceFrom $516 | Free Cancellation | Rating 7.3 2,921 reviews | |||
| PriceFrom $554 | Free Cancellation | Rating 7.0 9,264 reviews | |||
| PriceFrom $559 | Free Cancellation | Rating 7.6 1,275 reviews | |||
| PriceFrom $578 | Free Cancellation | Rating 7.0 2,703 reviews | |||
| PriceFrom $585 | Free Cancellation | Rating 7.0 1,076 reviews |
Traveling to a place near London?
Book flights to London if you plan to visit one of these locationsGatwick
Hounslow
Croydon
Luton
Slough
Guildford
Dartford
Dover
Stansted
Hayes
Salisbury
Ilford
Milton Keynes
Canterbury
Colchester
Wembley
Swindon
Chelmsford
Richmond
Poole
Why use momondo?
Why should I use momondo to find a flight deal from Illinois to London?
momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Illinois to London. momondo saves you time and could save you money on your trip.
Can I find flights from Illinois to London with flexible booking policies on momondo?
Yes. momondo allows you to filter the results for Illinois to London flights to just show those with flexible booking policies.
How can momondo help me find flights from Illinois to London?
Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to London from Illinois.
I’m not ready to book a flight from Illinois to London right now. Can momondo alert me if prices change?
Yes. momondo can track prices for Illinois to London flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.
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