Cheap flights from London Heathrow Airport to Illinois from $351
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London Heathrow Airport to Illinois departing on 3/5. 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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Cheap round-trip flights
These are some of the best round-trip flight deals from London Heathrow Airport to Illinois 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 London Heathrow Airport to Illinois.
Cheap last minute flights
Planning a quick getaway from London Heathrow Airport to Illinois? 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 Illinois, so you can enjoy a seamless trip without layovers.
Icelandair flights from London Heathrow Airport to Illinois
Our best Icelandair deals on London Heathrow Airport to Illinois flight tickets
Icelandair![Icelandair]()
Apr 23![Icelandair]()
Apr 29
LHR9:25 pmLondon Heathrow
26h 55m
1 stop
ORD6:20 pmChicago O'Hare Intl
ORD7:30 pmChicago O'Hare Intl
18h 50m
1 stop
LHR8:20 pmLondon Heathrow
Icelandair![Icelandair]()
Apr 24![Icelandair]()
Apr 28
LHR1:05 pmLondon Heathrow
11h 15m
1 stop
ORD6:20 pmChicago O'Hare Intl
ORD7:30 pmChicago O'Hare Intl
10h 25m
1 stop
LHR11:55 amLondon Heathrow
Lufthansa flights from London Heathrow Airport to Illinois
Our best Lufthansa deals on London Heathrow Airport to Illinois flight tickets
Lufthansa![Lufthansa]()
Mar 20![Lufthansa]()
Mar 27
LHR7:40 amLondon Heathrow
12h 30m
1 stop
ORD3:10 pmChicago O'Hare Intl
ORD10:10 pmChicago O'Hare Intl
8h 05m
LHR11:15 amLondon Heathrow
Lufthansa![Lufthansa]()
Mar 10![Lufthansa]()
Mar 25
LHR8:55 amLondon Heathrow
13h 20m
1 stop
ORD5:15 pmChicago O'Hare Intl
ORD10:10 pmChicago O'Hare Intl
8h 05m
LHR11:15 amLondon Heathrow
See travel insights to Illinois from
How to get the cheapest flight ticket from London Heathrow Airport to Illinois
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 Illinois?
The cheapest month to fly to Illinois from London Heathrow Airport is in February. Flight prices, which tend to average around $604, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of February, then flying in March is also cheap. Prices for this month can be found on momondo for an average of $623.
What is the cheapest day to depart on your flight to Illinois?
The cheapest day to depart from London Heathrow Airport to Illinois is on a Thursday when prices can be found for as low as $802. Flights from London Heathrow Airport to Illinois on a Sunday will generally be more expensive and average around $958. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.
What is the cheapest time of day to depart on your flight to Illinois?
Our most recent data shows that the best time of day to fly to Illinois is in the evening. Flights from London Heathrow Airport to Illinois during this time can be as low as $620. Flights in the afternoon are often more expensive with an average ticket price of $936.
What is the cheapest London Heathrow to Illinois flight route?
Fly from London Heathrow to Chicago O'Hare Intl for the best London Heathrow - Illinois flight prices
How far in advance should I book a flight to Illinois?
You are more likely to see cheaper flights to Illinois from London Heathrow Airport when booking 14 weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $739 when searching 14 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from London Heathrow Airport for as low as $716 on momondo.
What cabin class options are available on London Heathrow to Illinois flights?
There are 4 cabin classes available to choose from on London Heathrow to Illinois 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 London Heathrow to Illinois?
WestJet, Icelandair, and Aer Lingus are the most popular carriers operating from London Heathrow to Illinois
What airlines fly to Illinois?
American Airlines, British Airways and Aer Lingus are the top three most popular airlines that fly to Illinois from London Heathrow Airport according to our data. American Airlines is the first choice among our users, with 38% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 10 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.
How many flights depart from London Heathrow Airport to Illinois on average per day?
As of February 2025, there are 35 flights per day flying from London Heathrow Airport to Illinois. The most common time of day flights depart is 11:00AM, with 51% of flights taking off in the afternoon.
How many flights depart from London Heathrow Airport to Illinois on average per week?
The number of flights available between London Heathrow Airport and Illinois is 251 per week as of February 2025. The most frequent departure day is Wed, with 15% of weekly flights leaving on this day.
Cheap London Heathrow Airport to Illinois flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from London Heathrow Airport to Illinois
When did momondo last update prices for flights from London Heathrow Airport to Illinois?
Prices for flights from London Heathrow Airport to Illinois refresh daily.
How many operators does momondo search for flights from London Heathrow Airport to Illinois?
There are 10 operators available for flights from London Heathrow Airport to Illinois as of February 2025.
How old do you have to be to fly from London Heathrow Airport to Illinois?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from London Heathrow Airport to Illinois.
What documentation or ID do you need to fly to Illinois?
The required travel and health documents for your Illinois trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Illinois. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from London Heathrow Airport to Illinois?
momondo data reveals that the most frequently booked plane model on the route from London Heathrow Airport to Illinois is Boeing 767-300, representing 25.41% of all bookings. The subsequent popular models are Boeing 787-10 Dreamliner at 21.50%, Boeing 777 at 21.40%, and Airbus A350-900 at 7.68%.
Best airlines flying from London Heathrow Airport to Illinois
Compare and see reviews for airlines that fly from London Heathrow Airport to Illinois with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $451 | Free Cancellation | Rating 7.0 491 reviews | |||
| PriceFrom $462 | Free Cancellation | Rating 7.3 1,325 reviews | |||
| PriceFrom $483 | Free Cancellation | Rating 7.1 1,847 reviews | |||
| PriceFrom $556 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $576 | Free Cancellation | Rating 7.1 1,070 reviews | |||
| PriceFrom $579 | Free Cancellation | Rating 7.4 8,766 reviews | |||
| PriceFrom $582 | Free Cancellation | Rating 7.0 2,639 reviews | |||
| PriceFrom $589 | Free Cancellation | Rating 6.6 6,763 reviews | |||
| PriceFrom $607 | Free Cancellation | Rating 7.6 1,273 reviews | |||
| PriceFrom $660 | Free Cancellation | Rating 6.7 6,984 reviews |
Why use momondo?
Why should I use momondo to find a flight deal from London to Illinois?
momondo collates all your flight options in one place and lets you filter them to find the perfect flight from London to Illinois. momondo saves you time and could save you money on your trip.
Can I find flights from London to Illinois with flexible booking policies on momondo?
Yes. momondo allows you to filter the results for London to Illinois flights to just show those with flexible booking policies.
How can momondo help me find flights from London to Illinois?
momondo provides multiple filters to help you find the best flight to Illinois from London. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.
I’m not ready to book a flight from London to Illinois right now. Can momondo alert me if prices change?
Of course. momondo tracks the price of London to Illinois flights. All you need is a valid email address and we will do the rest; it is that quick and easy.
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