Heathrow and Gatwick both have strong London transport links. The useful comparison starts with flight timing, price, destination airport at the other end and your London address.
Heathrow access
Heathrow is connected by the Elizabeth line, London Underground and Heathrow Express. It has four active passenger terminals, so terminal-specific connection planning matters.
Gatwick access
Gatwick’s rail station is at South Terminal, with a free shuttle to North Terminal. Gatwick Express, Thameslink and Southern serve different London stations and trip patterns.
Connecting between them is not simple
If an itinerary changes airports between LHR and LGW, you must travel landside across London. Gatwick lists direct coaches around one hour and a rail routing around 90 minutes before airport processing.
Decision checklist
Compare total ground journey to your accommodation, flight schedule, bags, terminal transfer, overnight timing and whether a disruption would strand a separate-ticket itinerary.
Frequently asked questions
Is Gatwick connected to London by train?
Yes. The rail station is at South Terminal, with multiple operators serving London.
Can I make a tight Heathrow-to-Gatwick connection?
Treat it as an airport change with immigration/bags where applicable, ground transport and a new departure process. A vehicle journey time is not a safe connection-time estimate.
Sources and verification
Time-sensitive airport, airline, visa, security and transport details should always be confirmed with the relevant official source before travel.