£425 Cheap Flights from Chicago (CHIA) to London Heathrow (LHR)

Q: How much are return flights from Chicago to London Heathrow?

The best price we found for a return flight from Chicago to London Heathrow is £425. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

Q: How long does it take to fly from Chicago to London Heathrow?

7 hours and 54 minutes is the average flight time from Chicago to London Heathrow.

Q: Which airlines fly direct from Chicago to London Heathrow?

Alaska Airlines, American Airlines and British Airways fly direct from Chicago to London Heathrow.

Q: How many flights are there a week from Chicago to London Heathrow?

As of April 2025, there are 372 flights per week flying from Chicago to London Heathrow.

Q: When is the cheapest time to fly from Chicago to London Heathrow?

The cheapest month to fly from Chicago to London Heathrow is usually April 2025.

Q: Which upcoming date is cheapest to fly from Chicago to London Heathrow Airport on?

After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Chicago to London Heathrow Airport on Wednesday, 30 April 2025 .

Q: Can I get a direct flight from Chicago to London Heathrow Airport?

Yes – the average flight time is 7 hours and 54 minutes.

Q: How can I find the best flight deal to London Heathrow?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to London Heathrow but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

Q: When is the best time to book flights to London?

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to London is around 40 days in advance, so don’t leave your flight to the last minute.

Q: Which is the cheapest airline to fly from Chicago to London Heathrow with?

The cheapest airline that flies to London Heathrow is Finnair .

Compare Chicago to London Heathrow flight deals

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Flight deals from Chicago to London Heathrow

Looking for a cheap last-minute deal or the best return flight from Chicago to London Heathrow? Find the lowest prices on one-way and return tickets right here.

London.£425 per passenger.Departing Wed, 30 Apr, returning Tue, 13 May.Return flight with Finnair.Outbound indirect flight with Finnair, departs from Chicago O'Hare International on Wed, 30 Apr, arriving in London Heathrow.Inbound indirect flight with Finnair, departs from London Heathrow on Tue, 13 May, arriving in Chicago O'Hare International.Price includes taxes and charges.From £425, select.

London.£430 per passenger.Departing Mon, 5 May, returning Wed, 14 May.Return flight with Finnair.Outbound indirect flight with Finnair, departs from Chicago O'Hare International on Mon, 5 May, arriving in London Heathrow.Inbound indirect flight with Finnair, departs from London Heathrow on Wed, 14 May, arriving in Chicago O'Hare International.Price includes taxes and charges.From £430, select.

London.£434 per passenger.Departing Mon, 1 Sep, returning Tue, 9 Sep.Return flight with Scandinavian Airlines.Outbound indirect flight with Scandinavian Airlines, departs from Chicago O'Hare International on Mon, 1 Sep, arriving in London Heathrow.Inbound indirect flight with Scandinavian Airlines, departs from London Heathrow on Tue, 9 Sep, arriving in Chicago O'Hare International.Price includes taxes and charges.From £434, select.

London.£437 per passenger.Departing Wed, 11 Feb, returning Mon, 16 Feb.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Chicago O'Hare International on Wed, 11 Feb, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Mon, 16 Feb, arriving in Chicago O'Hare International.Price includes taxes and charges.From £437, select.

London.£438 per passenger.Departing Wed, 10 Dec, returning Sat, 17 Jan.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Chicago O'Hare International on Wed, 10 Dec, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Sat, 17 Jan, arriving in Chicago O'Hare International.Price includes taxes and charges.From £438, select.

London.£439 per passenger.Departing Mon, 23 Mar, returning Tue, 31 Mar.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Chicago O'Hare International on Mon, 23 Mar, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Tue, 31 Mar, arriving in Chicago O'Hare International.Price includes taxes and charges.From £439, select.

London.£439 per passenger.Departing Tue, 30 Sep, returning Fri, 10 Oct.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Chicago O'Hare International on Tue, 30 Sep, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Fri, 10 Oct, arriving in Chicago O'Hare International.Price includes taxes and charges.From £439, select.

London.£440 per passenger.Departing Fri, 17 Oct, returning Mon, 27 Oct.Return flight with Icelandair.Outbound indirect flight with Icelandair, departs from Chicago O'Hare International on Fri, 17 Oct, arriving in London Heathrow.Inbound indirect flight with Icelandair, departs from London Heathrow on Mon, 27 Oct, arriving in Chicago O'Hare International.Price includes taxes and charges.From £440, select.

Find the cheapest month to fly from Chicago to London Heathrow

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Chicago to London Heathrow flights are currently cheapest in May.

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Direct flights from Chicago to London Heathrow

Chicago to London Heathrow: Alternative routes

Compare routes from Chicago to London below. You may find an airport to fly into that's cheaper, faster, or easier than London Heathrow.

Chicago to London: Flight information

The things to know before you go.

Cheapest flight found	£425
Cheapest month to fly	April
Average flight time	7 hrs, 54 mins
Most popular airline	Alaska Airlines
Average flights per week	372

Finding cheap flights from Chicago to London Heathrow: Frequently asked questions

How much are return flights from Chicago to London Heathrow?

How long does it take to fly from Chicago to London Heathrow?

Which airlines fly direct from Chicago to London Heathrow?

How many flights are there a week from Chicago to London Heathrow?

When is the cheapest time to fly from Chicago to London Heathrow?

Which upcoming date is cheapest to fly from Chicago to London Heathrow Airport on?

Can I get a direct flight from Chicago to London Heathrow Airport?

How can I find the best flight deal to London Heathrow?

When is the best time to book flights to London?

Which is the cheapest airline to fly from Chicago to London Heathrow with?

Travelling from Chicago to London Heathrow Airport (LHR): what you need to know

There are a couple of main airports to choose from in Chicago. Explore your options departing from O'Hare International Airport (ORD) or Chicago Midway International Airport (MDW) when searching for a flight from Chicago to London Heathrow Airport (LHR).
7 hours 53 minutes is the average duration of a direct flight from Chicago to London Heathrow Airport.
The timezone in London is UTC+0, which is 5 hours ahead of Chicago. London Heathrow Airport is located in London.
With 89 direct weekly flights between the two airports, O'Hare International Airport (ORD) to London Heathrow Airport (LHR) is the busiest route. American Airlines operates the earliest flight at 08:10. If you prefer to make the most of your day before leaving, the last flight from ORD to LHR is with American Airlines at 23:05.
To ensure you catch your flight from Chicago to LHR, allow plenty of time to check in and find your gate. Arriving two hours before international departures and an hour before domestic flights is the standard rule.
Flying during a peak month like August? Popular seasons (like Thanksgiving, Christmas and New Year) can add another hour at check-in and security. Be extra safe and arrive up to four hours ahead of international flights and two hours before domestic departures.

Airports in Chicago

O'Hare International Airport (ORD)

O'Hare International Airport (ORD) offers an easy route to your destination. Nonstop flights from Chicago to London Heathrow Airport (LHR) operate out of this terminal.
You'll have your pick of carriers that operate direct flights from Chicago to London Heathrow Airport departing from ORD. Book your seat with one of these:
Stopovers are the ideal opportunity to break up your trip — and maybe even tour another city. When browsing flights from Chicago to LHR leaving from O'Hare International Airport (ORD), uncheck the 'Direct flights only' box to see where you can stop along the way. Popular options include:
- Edinburgh Airport (EDI)
- Detroit Metropolitan Wayne County Airport (DTW)
- Pearson International Airport (YYZ)
From central Chicago, ORD is approximately 25 miles away. Use navigation apps or visit the official airport website to find the best way to arrive at the terminal.
Want a leisurely start to your break? Stay near O'Hare International Airport. Whether you're catching an early flight from Chicago to London Heathrow Airport or just don't want to be rushed, these hotels are just the thing:

Chicago Midway International Airport (MDW)

Prefer to leave from Chicago Midway International Airport (MDW)? You can book a direct flight from Chicago to London Heathrow Airport (LHR) departing from this hub.
Popular airlines that have direct flights from Chicago to LHR departing from MDW include:
Visit family or friends or just take a moment to freshen up with a stopover. If you'd like to split up your flight from Chicago to London Heathrow Airport, check out these options when setting off from Chicago Midway International Airport:
- Montreal-Pierre Elliott Trudeau International Airport (YUL)
- Dublin Airport (DUB)
- Pearson International Airport (YYZ)
MDW is about 12 miles from central Chicago. It'll take you 21 minutes or so to get to the airport by car from the city centre. Public transport takes roughly 46 minutes.
Want to enjoy an extra night away before boarding your flight from Chicago to LHR? Unwind in a hotel near Chicago Midway International Airport before your break officially starts. Check out these accommodation options:

About London Heathrow Airport (LHR)

The last thing you need is a long journey to your hotel if you're arriving on a late flight from Chicago to London Heathrow Airport. Reserve one of these accommodation options near LHR instead:

Getting from London Heathrow Airport (LHR) to central London

London Heathrow Airport to central London takes about 57 minutes by car. It's approximately 19 miles away. Discover what options are available, such as cabs, car rentals or ride-sharing.
If you're travelling on public transport, expect a journey of around 1 hour and 1 minute.

How to find the cheapest flights from Chicago to London Heathrow Airport (LHR)

The best price we've found for a one-way ticket from Chicago to London Heathrow Airport is £175. The cheapest price for a return flight is £425. Keep in mind fares can change due to demand at the time of booking.
To score cheap tickets from Chicago to LHR, reserve your journey 2 months ahead of your departure.
To get the best deal on your tickets from Chicago to London Heathrow Airport, plan your trip for November (it has the cheapest flights). Flexible with your dates? Use the 'Whole month' tool to zero in on the most affordable day to fly.
Log into your online account or use the app to create a Price Alert. You'll be notified straight away if there's a deal you can't miss. It's simple to do, and it'll save you from looking for a cheap ticket from Chicago to LHR every day.
Customise your journey with filters. Adjust the total duration, number of stops, and arrival and departure times to find the ideal flight from Chicago to London Heathrow Airport. You can also sort the results to see the 'Cheapest,' 'Best' or 'Fastest' options first.

The best time to fly from Chicago to London Heathrow Airport (LHR)

July is the most popular month for flights from Chicago to London Heathrow Airport. To avoid the crowds, travel to London in February when things are quieter.
Before locking in your flight from Chicago to LHR, think about the type of weather you enjoy. July is the warmest month in London, with temperatures ranging from 11ºC to 26ºC.
If you like cooler conditions, look for a cheap flight from Chicago to London Heathrow Airport in January when temperatures average between 0ºC and 9ºC.

More about London

Start your London trip off on the right foot by choosing the perfect place to stay. After booking your flight from Chicago to London Heathrow Airport, check out our range of hotels including:
One of the best ways to get to know London is to explore its most popular sights. Highlights include Big Ben, The British Museum and Buckingham Palace.

Complete your London trip with a car rental

We use the same magic that helped you find your cheap flight from Chicago to London Heathrow Airport to track down your ideal ride. Browse our car rentals in London and easily compare your options. Plus we give you all the info you need to know, from the most popular rental company to the average daily price.