Route guide
Los Angeles → London
A popular but paperwork-precise route. Great Britain’s scheme adds a tapeworm treatment for dogs and an approved-route requirement, and most carriers move pets to London as cargo rather than in-cabin.
What this route involves
Flying from Los Angeles to London means clearing United Kingdom entry rules on arrival and meeting your airline’s own conditions on departure. Below are both, plus the order to do them in.
Leaving United States
Requirements differ sharply depending on where your dog has been in the previous six months. Cats face no federal rabies requirement, though individual states may add their own.
See full entry rulesEntering United Kingdom
Great Britain accepts pets under its own post-Brexit scheme. Dogs, cats and ferrets need an ISO microchip, a rabies vaccination and a GB health certificate, and dogs additionally need a tapeworm treatment recorded shortly before arrival.
See full entry rulesAirlines on this route
Airline rules stack on top of the country rules above. Confirm both before you book.
Your chronological checklist
Work backwards from your travel date. Start the earliest step first — some cannot be rushed.
- 1 Implant an ISO 11784/11785 microchip22 days before travel
It has to come first: every later certificate references this number, and a rabies shot given before the chip usually does not count.
- 2 Rabies vaccination21 days before travel
Must be given after the microchip and be valid on the day you travel. Most destinations also require a minimum of 21 days between the shot and entry.
- 3 Book the flight and reserve the pet slot30 days before travel
Airlines cap how many animals travel per flight. The pet slot runs out well before the seats do.
- 4 Health certificate and official endorsement2 days before travel
Issued by an accredited vet close to departure, then endorsed by your government authority. This endorsement cannot be done at the airport.
- 5 Tapeworm treatment1 days before travel
Required by a few destinations for dogs, and the window is unforgiving: it must be given between 24 and 120 hours before you arrive, and recorded by the vet.
- 6 Travel dayTravel day
Carry the originals plus copies of everything, arrive early, and keep the crate documents attached to the crate.