Cheap Flights from San Juan to London Heathrow

Compare San Juan to London Heathrow flight deals

Find the cheapest month or even day of the year to fly to London Heathrow

Book the best London Heathrow fare with no extra fees

Flight deals from San Juan to London Heathrow

Looking for a cheap last-minute deal or the best return flight from San Juan to London Heathrow? Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from San Juan to London Heathrow

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like San Juan to London Heathrow flights are currently cheapest in December.

San Juan to London Heathrow: Alternative routes

Compare routes from San Juan to London below. You may find an airport to fly into that's cheaper, faster, or easier than London Heathrow.

San Juan to London: Flight information

The things to know before you go.
Cheapest flight foundR 4,504
Cheapest month to flyDecember

Finding cheap flights from San Juan to London Heathrow: Frequently asked questions

The best price we found for a return flight from San Juan to London Heathrow is R 10,410. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from San Juan to London Heathrow. But we found flights with one stop from R 10,410.
As of October 2025, there are no flights flying from San Juan to London Heathrow.
The cheapest month to fly from San Juan to London Heathrow is usually December.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from San Juan to London Heathrow Airport on Friday, 5 December 2025.
No airlines currently offer direct flights between San Juan and London Heathrow Airport. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to London Heathrow but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to London is around 40 days in advance, so don’t leave your flight to the last minute.
The cheapest airline that flies to London Heathrow is United .

Travelling from San Juan to London Heathrow Airport (LHR): What you need to know

  • Planning your holiday begins with working out where you'll leave from in San Juan. Luis Munoz Marin International Airport (SJU) is the city's main airport, so check out your options for reserving a flight from San Juan to London Heathrow Airport (LHR) departing from here.

  • The timezone in London is UTC+0, which is four hours ahead of San Juan. London Heathrow Airport is located in London.

  • Arrive at the airport on time so you don't miss your flight from San Juan to LHR. Be there at least two hours ahead for international flights and an hour early for domestic departures to skip the mad dash to your gate.

  • If you're heading away during a major holiday or other peak period, allow extra time. Arrive two hours before domestic flights and up to four hours before international departures. Lines at security and check-in will be longer.

Airports in San Juan

Luis Munoz Marin International Airport (SJU)

  • Consider adding a stopover to find cheap flights from San Juan to LHR. Simply deselect 'Direct flights only' when searching for departures from Luis Munoz Marin International Airport (SJU). Break up your trip (and maybe get a better deal) by stopping at one of these airports:

    • John F. Kennedy International Airport (JFK)

    • Adolfo Suarez Madrid-Barajas Airport (MAD)

    • Logan International Airport (BOS)

  • The journey from central San Juan to SJU takes around 55 minutes on public transport. If you drive, ride-share or grab a cab, you'll cover the 8 kilometres in 10 minutes or so, depending on traffic.

  • Want a hassle-free start to your holiday? Stay near Luis Munoz Marin International Airport. Whether you've booked an early flight from San Juan to London Heathrow Airport or aren't a fan of being rushed, these hotels offer the perfect solution:

  • When it comes to the on-time performance of Luis Munoz Marin International Airport, 73.65% of flights meet their scheduled arrival time.

Fernando Luis Ribas Dominicci Airport (SIG)

About London Heathrow Airport (LHR)

Getting from London Heathrow Airport (LHR) to central London

  • London Heathrow Airport to the centre of London is roughly 26 kilometres. If you're getting a cab or renting a car, do a little research to make your trip as easy as possible. Journey times may vary based on traffic and the time of day.

  • If you're using public transport, expect a journey of around 1 hour.

How to find the cheapest flights from San Juan to London Heathrow Airport (LHR)

  • The lowest price we've found for a one-way ticket from San Juan to London Heathrow Airport is R 4,504. For a return flight on this route, the best price is R 10,410. Depending on when you want to go and the availability, these fares can change.

  • Don't leave things to the last moment. You're more likely to find cheap flights from San Juan to LHR if you book in advance. Airlines often have some great early bird deals.

  • The 'Whole month' search tool shows you the cheapest San Juan to London Heathrow Airport tickets throughout the month. It's an easy way to find a bargain if your travel dates are flexible.

  • Spend less time searching for cheap plane tickets from San Juan to LHR by setting up a Price Alert. We'll send you an email or notification through the app when a lower fare pops up.

  • Uncover a great deal on a flight from San Juan to London Heathrow Airport with the help of the filters. Choose your ideal arrival and departure times, airlines and number of stops. You can also sort your results by 'Fastest,' 'Cheapest' or 'Best.'

The best time to fly from San Juan to London Heathrow Airport (LHR)

  • July is when most people book flights from San Juan to London Heathrow Airport (LHR). Plan your visit to London in February if you'd rather avoid peak season.

  • The warmest month in London is July, with temperatures ranging between 11ºC (52ºF) and 26ºC (79ºF). Lock in your San Juan to LHR plane ticket then if that's your idea of comfortable weather.

  • January sees temperatures of between 0ºC (32ºF) and 9ºC (48ºF). Search for cheap tickets from San Juan to London Heathrow Airport around that time if you want to travel when it's cooler.

More about London

  • When it comes to searching for somewhere to rest your head, you'll find the best places to stay in London right here. Explore these hotels as soon as you've locked in your flight from San Juan to London Heathrow Airport:

  • The British Museum and Westminster Abbey are just a couple of the top-rated attractions to add to your London travel itinerary. Keep the adventure rolling by checking out Big Ben.

Explore more of the United Kingdom

  • London has plenty going for it, but there are so many other parts of the United Kingdom you should also see. About 153 kilometres north-west of London, a visit to Birmingham will keep you on the move. Start with leading attractions like The Windsor Castle, Birmingham Museum & Art Gallery and Birmingham Hippodrome Theatre.

  • Bristol is another favourite destination in the United Kingdom and is around 145 kilometres west of London. No journey is complete without visiting Banksey, Banksy's You Don't Need Planning Permission to Build Castles in the Sky and Clifton Suspension Bridge.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.