On this page (6 sections)
Scheduled departure 12:20, London time.
See how CX252 is running today on the Heathrow departures board, or follow the aircraft on Flightradar24.
Which terminal this flight departs from
Departs from Terminal 3, in the Central Terminal Area, home to most of oneworld plus Virgin Atlantic, Delta and Emirates. Check-in and bag drop are on the departures level of the main terminal, then a single central security search. There are lounges in Terminal 3 airside, and you can check the security queue first. It shares the Heathrow Terminals 2 and 3 station on the Elizabeth Line, the Piccadilly Line and Heathrow Express, a short covered walk from departures. See the Terminal 3 guide.
Check-in, bag drop and security
Online check-in usually opens 24 hours before departure. Bag drop desks generally open about three hours before a long-haul flight and close 60 minutes before departure, though the exact cutoff is set by the airline, so confirm yours. Everyone leaving goes through the same central security search: liquids follow the limits shown at the terminal on the day, and the hand-baggage rules are on the luggage page. Fast Track security is sold at some terminals if you would rather skip the main queue. For a long-haul departure, arriving about three hours before takeoff leaves room for bag drop, security and the walk to a satellite gate.
What the departure time means for the queues
A daytime departure. Security is steadier than the early-morning peak but still busy at a hub this size, so keep to the recommended arrival time. Every onward option into the terminal is running: the Elizabeth Line, Piccadilly Line, Heathrow Express and the coaches.
Seeing someone off on CX252
You can only go through to the departure lounge with a boarding pass, so there is no gate farewell at Heathrow. Say your goodbyes landside in the Terminal 3 departures hall, before the passenger goes through security. If you have driven, the cheapest place to wait is Terminal 3 short-stay rather than the forecourt, where the £7 drop-off charge applies.
Getting to and from Heathrow
Getting to Heathrow for CX252: if someone is dropping you off, the forecourt carries a £7 charge, or they can use the Terminal 3 Park & Ride free 29-minute window instead. For public transport into the terminal, compare the Heathrow Express, the Elizabeth Line, the Piccadilly Line, coaches, black cabs and private transfers.