flight_takeoff ORD → LHR

Cheap Flights from Chicago to London

Compare fares on the ultra-long-haul flight from Chicago to London — a northeastbound route of about 3,942 miles, typically flown nonstop in around 8h 25m.

straighten

Distance

3,942 mi

6,344 km

schedule

Est. flight time

8h 25m

nonstop

flight

Nonstop service

Available

8 carriers

language

Time difference

6 hours ahead

London

Flying from Chicago to London

Flights from Chicago O'Hare International Airport (ORD) to London Heathrow Airport (LHR) cover roughly 3,942 miles (6,344 km) on a northeastbound heading, a nonstop flight of about 8h 25m. The route crosses 6 time zones — London is 6 hours ahead of Chicago. It's a competitive route served by 8 airlines. As an international route, make sure your passport is valid and allow extra time for customs and immigration on arrival.

Lets Fly Travel compares live fares across hundreds of airlines to find the best deal on this route — and every booking is reviewed by a real travel agent before ticketing.

Airlines on this route

Carriers that have operated nonstop service between ORD and LHR include:

flightAmerican Airlines flightBritish Airways flightDelta Air Lines flightFinnair flightIberia Airlines flightLufthansa Cargo flightUnited Airlines flightVirgin Atlantic Airways

Airline availability and fares change over time — search your dates for current options.

Best time to fly Chicago to London

Fare patterns and travel conditions vary by season. Here's what to expect on the ORD–LHR route throughout the year.

Jan–Feb

Winter is often off-peak for London — expect fewer crowds and lower fares on the ORD–LHR route. Book early for spring breaks.

Mar–May

Spring brings pleasant weather to many destinations. Fares on the Chicago–London route can spike around school holidays — compare a few nearby dates.

Jun–Aug

Peak summer travel season. Chicago to London fares are typically at their highest. Book at least 6–8 weeks ahead and consider mid-week departures.

Sep–Oct

Shoulder season is often the sweet spot: good weather, thinner crowds, and more competitive fares on the ORD–LHR route.

Nov–Dec

Thanksgiving and Christmas drive fare spikes. If you're flying Chicago to London for the holidays, book as early as possible.

flight_land Arriving at

London Heathrow Airport

London is served by London Heathrow Airport (IATA: LHR , ICAO: EGLL). The airport is located in United Kingdom. As an international arrival, allow additional time for customs and immigration.

IATA Code

LHR

Flight Time

~8h 25m

Distance

3,942 mi

tips_and_updates Arrival tips

  • ›Check in online to save time at the airport.
  • ›Arrive 3 hours before departure.
  • ›Carry a valid passport and check visa requirements.
  • ›Compare fares across several nearby dates for best value.

Chicago to London — FAQs

How long is the flight from Chicago to London? expand_more
A nonstop flight from Chicago (ORD) to London (LHR) takes approximately 8h 25m, covering a distance of about 3942 miles (6344 km). Actual flight time varies with aircraft, routing and winds.
Which airlines fly from Chicago to London? expand_more
Airlines that have operated nonstop service on the ORD–LHR route include American Airlines, British Airways, Delta Air Lines, Finnair, Iberia Airlines, Lufthansa Cargo, United Airlines, Virgin Atlantic Airways. Use our search to compare current carriers, schedules and fares.
Is there a nonstop flight from Chicago to London? expand_more
Yes. The ORD–LHR route has nonstop service. Nonstop availability can vary by season and day of week, so check live results for your dates.
How far is London from Chicago? expand_more
The distance from Chicago (ORD) to London (LHR) is about 3942 miles (6344 km) as the crow flies.
What is the time difference between Chicago and London? expand_more
London is 6 hours ahead of Chicago. Factor the time change into your arrival and connection planning.
When is the best time to book flights from Chicago to London? expand_more
For international trips like Chicago to London, booking roughly 2–6 months ahead and flying mid-week (Tuesday/Wednesday) tends to surface the lowest fares. Set up a search early and compare a few date options.
Do I need a passport to fly from Chicago to London? expand_more
Yes. Flights from Chicago to London are international, so you'll need a valid passport — and possibly a visa, depending on your nationality and London's entry requirements. Check the destination's current entry rules before you travel.

More flights from Chicago

More flights to London