Chicago O'Hare to London Heathrow
3942 miles great-circle distance, typically flown in 8h 20m with 9 airlines operating direct service from Chicago O'Hare (ORD) to London Heathrow (LHR). Cheapest fares are usually in Jun (around $532 return), with peak prices in Jun (around $532). Departures on a Tuesday tend to undercut weekend prices on this corridor.
Flying from Chicago O'Hare
Chicago O'Hare is one of America's two busiest hubs and the home base for both United and American — Terminals 1 and 2 belong to United, Terminal 3 to American, and Terminal 5 handles all international arrivals. The CTA Blue Line runs from a station at the airport to downtown Loop in around 45 minutes for $5. Winter weather drives chronic delays from late November through February, so build in connection padding through ORD between Thanksgiving and President's Day.
Arriving in London
London Heathrow is 24 km west of central London — the deepest transatlantic hub from anywhere on the US East Coast. The Elizabeth Line and Heathrow Express both reach Paddington (15 minutes Express, 30 minutes Elizabeth) for £25 and £13.30 respectively. US carriers (American, Delta, United, JetBlue) and BA dominate the corridor. Cheapest fares from US East Coast: late January and February; peak demand is June–August.
Who flies ORD to LHR?
| Airline | IATA | Flight time | Cabin |
| United Airlines | UA | 8h 20m | Economy |
| American Airlines | AA | 8h 20m | Economy |
| British Airways | BA | 8h 20m | Economy |
| Lufthansa | LH | 8h 20m | Economy |
| Air France | AF | 8h 20m | Economy |
| KLM | KL | 8h 20m | Economy |
| ANA | NH | 8h 20m | Economy |
| Japan Airlines | JL | 8h 20m | Economy |
| Cathay Pacific | CX | 8h 20m | Economy |
9 carriers fly direct on this corridor. Frequencies vary by season — summer and winter holiday peaks see additional flights.
Best time to fly ORD→LHR
Synthesised from 12-month price aggregates. Cheapest months in green, peak in red.
Estimated baseline. Prices update on a 30-day cadence as Travelpayouts data refreshes. Cheapest day-of-week typically Tuesday.
Chicago to London FAQs
Direct flights from Chicago O'Hare (ORD) to London Heathrow (LHR) take approximately 8h 20m for the 3942-mile journey, plus 30–60 minutes of taxi, climb and descent. Total airport-to-airport time depends on cruise winds and air-traffic queueing on approach.
Jun is typically the cheapest month on this route, with one-way fares from $532. Jun is the peak — expect prices 2–3× higher. Book 4–8 weeks ahead for best fares; last-minute prices on this corridor rise sharply inside two weeks of departure.
9 carriers operate direct service from Chicago O'Hare (ORD) to London Heathrow (LHR): United Airlines, American Airlines, British Airways, Lufthansa, Air France and 4 more. Frequencies vary by season and carrier — United Airlines typically operates the highest weekly count on this corridor.
Electronic Travel Authorisation (ETA) required for US passport holders from 2025 — apply online, £10. Always check travel.state.gov for the latest entry requirements before booking.
London Heathrow (LHR) is the primary international airport for London. Allow 30–60 minutes for the ground transfer by train, express bus, taxi or rideshare depending on traffic and time of day. See the airport's official website for current train and shuttle timetables.