Cheap flights from Illinois to London from $218
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 7/30. 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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Icelandair flights from Illinois to London Heathrow Airport
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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?
The month of November is, on average, the cheapest month to fly to London Heathrow Airport from Illinois, with most prices found around $657. If you’re not able to fly to London Heathrow Airport in November, then April is your next best option. Flight prices from Illinois to London Heathrow Airport during April 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 $765. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $887.
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 $698. 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 afternoon are often more expensive with an average ticket price of $824.
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 $802 when searching 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 $715 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 46% 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 June 2025, there are 50 flights per day flying from Illinois to London Heathrow Airport. The most common time of day flights depart is 4:00PM, with 63% of flights taking off in the evening.
How many flights depart from Illinois to London Heathrow Airport on average per week?
352 flights are operational weekly from Illinois to London Heathrow Airport as of June 2025. The most popular departure day for this route is Mon, with 14% 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 June 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 (42.13% of total bookings). The next most popular plane models are Boeing 777 (18.51%), Boeing 787-10 Dreamliner (18.10%), and Boeing 767-300 (12.87%).
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 1,649 reviews | |||
| PriceFrom $345 | Free Cancellation | Rating 8.0 7,964 reviews | |||
| PriceFrom $381 | Free Cancellation | Rating 7.3 1,410 reviews | |||
| PriceFrom $440 | Free Cancellation | Rating 6.8 7,191 reviews | |||
| PriceFrom $464 | Free Cancellation | Rating 7.0 506 reviews | |||
| PriceFrom $507 | Free Cancellation | Rating 7.1 1,903 reviews | |||
| PriceFrom $516 | Free Cancellation | Rating 7.3 2,922 reviews | |||
| PriceFrom $545 | Free Cancellation | Rating 7.1 1,131 reviews | |||
| PriceFrom $569 | Free Cancellation | Rating 7.6 1,298 reviews | |||
| PriceFrom $581 | Free Cancellation | Rating 7.0 2,802 reviews |
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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.