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Cheap flights from the United Kingdom to San Juan from £321

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from the United Kingdom to San Juan departing on 21/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from the United Kingdom to San Juan

Recent return flight deals from the United Kingdom to San Juan

Enter your travel dates to find the best prices.
Multiple Airlines Logo
14:00 - 09:47LGW-SJU
23h 47m1 stop
Multiple Airlines Logo
06:00 - 10:00SJU-LGW
24h 00m2 stops
£553Multiple Airlines
Find Deal
Fri, 9 Jan - Fri, 16 Jan
JetBlue Logo
12:20 - 02:33LHR-SJU
18h 13m1 stop
JetBlue Logo
11:15 - 09:30SJU-LHR
18h 15m1 stop
£553JetBlue
Find Deal
Thu, 5 Feb - Mon, 9 Feb
Icelandair Logo
07:25 - 19:13LHR-SJU
15h 48m1 stop
Icelandair Logo
08:15 - 21:40SJU-LHR
33h 25m1 stop
£554Icelandair
Find Deal
Tue, 6 Jan - Tue, 13 Jan
Multiple Airlines Logo
14:00 - 15:44LGW-SJU
29h 44m2 stops
Multiple Airlines Logo
07:15 - 06:00SJU-LGW
18h 45m1 stop
£558Multiple Airlines
Find Deal
Thu, 8 Jan - Sun, 18 Jan
Icelandair Logo
08:05 - 22:26LHR-SJU
18h 21m1 stop
Icelandair Logo
05:01 - 22:00SJU-LHR
12h 59m1 stop
£574Icelandair
Find Deal
Fri, 6 Mar - Sat, 14 Mar
Iberia Logo
09:10 - 19:55LCY-SJU
14h 45m1 stop
Iberia Logo
18:10 - 14:05SJU-LCY
15h 55m1 stop
£901Iberia
Find Deal
Mon, 9 Mar - Thu, 12 Mar
Iberia Logo
09:10 - 19:55LCY-SJU
14h 45m1 stop
Iberia Logo
21:25 - 08:50SJU-LCY
31h 25m1 stop
£923Iberia
Find Deal
Mon, 26 Jan - Thu, 5 Feb
British Airways Logo
06:30 - 19:55NCL-SJU
17h 25m2 stops
British Airways Logo
14:28 - 11:25SJU-NCL
16h 57m2 stops
£1,008British Airways
Find Deal
Thu, 5 Feb - Mon, 9 Feb
British Airways Logo
06:30 - 19:55NCL-SJU
17h 25m2 stops
British Airways Logo
14:28 - 14:55SJU-NCL
20h 27m2 stops
£1,011British Airways
Find Deal
Thu, 5 Feb - Mon, 9 Feb
Virgin Atlantic Logo
09:25 - 23:57NWI-SJU
18h 32m2 stops
Virgin Atlantic Logo
14:15 - 16:25SJU-NWI
22h 10m2 stops
£1,186Virgin Atlantic
Find Deal
Thu, 22 Jan - Mon, 26 Jan

Icelandair flights from United Kingdom to San Juan

Our best Icelandair deals on United Kingdom to San Juan flight tickets
Icelandair
6 Jan
LHR07:25London Heathrow
15h 48m
1 stop
SJU19:13San Juan Luis Munoz Marin Intl
13 Jan
SJU08:15San Juan Luis Munoz Marin Intl
33h 25m
1 stop
LHR21:40London Heathrow
£554
Find similar
Icelandair
6 Mar
LHR08:05London Heathrow
18h 21m
1 stop
SJU22:26San Juan Luis Munoz Marin Intl
14 Mar
SJU05:01San Juan Luis Munoz Marin Intl
12h 59m
1 stop
LHR22:00London Heathrow
£574
Find similar
Icelandair
12 Feb
LHR12:20London Heathrow
19h 34m
1 stop
SJU03:54San Juan Luis Munoz Marin Intl
18 Feb
SJU13:44San Juan Luis Munoz Marin Intl
15h 46m
1 stop
LHR09:30London Heathrow
£578
Find similar

Iberia flights from United Kingdom to San Juan

Our best Iberia deals on United Kingdom to San Juan flight tickets
Iberia
9 Mar
LCY09:10London City
14h 45m
1 stop
SJU19:55San Juan Luis Munoz Marin Intl
12 Mar
SJU18:10San Juan Luis Munoz Marin Intl
15h 55m
1 stop
LCY14:05London City
£901
Find similar
Iberia
26 Jan
LCY09:10London City
14h 45m
1 stop
SJU19:55San Juan Luis Munoz Marin Intl
5 Feb
SJU21:25San Juan Luis Munoz Marin Intl
31h 25m
1 stop
LCY08:50London City
£923
Find similar
Iberia
10 Dec
LCY07:50London City
12h 45m
1 stop
SJU16:35San Juan Luis Munoz Marin Intl
17 Dec
SJU21:25San Juan Luis Munoz Marin Intl
12h 40m
1 stop
LCY14:05London City
£924
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from United Kingdom to San Juan that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 279,928 searches. Data last updated 21 November 2025.
Use the filters below to find and compare flights from the United Kingdom to San Juan that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Fri 9/1

14:00-09:47

1 stop23h 47m

San Juan Luis Munoz Marin Intl

Fri 16/1

06:00-10:00

2 stops24h 00m

£553

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Thu 5/2

12:20-02:33

1 stop18h 13m

San Juan Luis Munoz Marin Intl

Mon 9/2

11:15-09:30

1 stop18h 15m

£553

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Tue 6/1

07:25-19:13

1 stop15h 48m

San Juan Luis Munoz Marin Intl

Tue 13/1

08:15-21:40

1 stop33h 25m

£554

LondonSan Juan

LGW - SJU

LGWSJU

London Gatwick

Thu 8/1

14:00-15:44

2 stops29h 44m

San Juan Luis Munoz Marin Intl

Sun 18/1

07:15-06:00

1 stop18h 45m

£558

LondonSan Juan

LHR - SJU

LHRSJU

London Heathrow

Fri 6/3

08:05-22:26

1 stop18h 21m

San Juan Luis Munoz Marin Intl

Sat 14/3

05:01-22:00

1 stop12h 59m

£574

LondonSan Juan

LCY - SJU

LCYSJU

London City

Mon 9/3

09:10-19:55

1 stop14h 45m

San Juan Luis Munoz Marin Intl

Thu 12/3

18:10-14:05

1 stop15h 55m

£901

LondonSan Juan

LCY - SJU

LCYSJU

London City

Mon 26/1

09:10-19:55

1 stop14h 45m

San Juan Luis Munoz Marin Intl

Thu 5/2

21:25-08:50

1 stop31h 25m

£923

Newcastle upon TyneSan Juan

NCL - SJU

NCLSJU

Newcastle upon Tyne

Thu 5/2

06:30-19:55

2 stops17h 25m

San Juan Luis Munoz Marin Intl

Mon 9/2

14:28-11:25

2 stops16h 57m

£1,008

Newcastle upon TyneSan Juan

NCL - SJU

NCLSJU

Newcastle upon Tyne

Thu 5/2

06:30-19:55

2 stops17h 25m

San Juan Luis Munoz Marin Intl

Mon 9/2

14:28-14:55

2 stops20h 27m

£1,011

NorwichSan Juan

NWI - SJU

NWISJU

Norwich Arpt

Thu 22/1

09:25-23:57

2 stops18h 32m

San Juan Luis Munoz Marin Intl

Mon 26/1

14:15-16:25

2 stops22h 10m

£1,186

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to San Juan from

How to get the cheapest flight ticket from United Kingdom to San Juan

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to San Juan?

The cheapest month to fly to San Juan from United Kingdom is in September. Flight prices, which tend to average around £545, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of September, then book flights to San Juan from United Kingdom during January instead. Flights to San Juan in January, while not as cheap as those in September, still average around £572.

What is the cheapest day to depart on your flight to San Juan?

The cheapest day to depart on your flight to San Juan is on a Monday when prices can be found for as low as £544. This is often the case because there is less demand to fly during this day of the week. The most expensive day to fly to San Juan is Saturday, with ticket prices averaging around £663.

What is the cheapest time of day to depart on your flight to San Juan?

In the morning is the cheapest time of day to fly from United Kingdom to San Juan when you can find flight prices for as low as £602. Flying to San Juan in the morning is an ideal time because this is during off-peak travel hours. Flights in the afternoon are often more expensive, with an average ticket price of £860.

How far in advance should I book a flight to San Juan?

You are more likely to see cheaper flights to San Juan from United Kingdom when booking weeks ahead of your departure date. In general, you can expect to find flights to San Juan for around £657 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Juan from United Kingdom for as low as £536 on momondo.

Cheap United Kingdom to San Juan flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from United Kingdom to San Juan

Direct flights

None
There are no direct flights from United Kingdom to San Juan. There are no popular flight routes from United Kingdom to San Juan.
Search flight deals

  • When did momondo last update prices for flights from United Kingdom to San Juan?

    Prices for flights from United Kingdom to San Juan are refreshed on a daily basis.

  • How many operators does momondo search for flights from United Kingdom to San Juan?

  • How old do you have to be to fly from United Kingdom to San Juan?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from United Kingdom to San Juan.

  • What documentation or ID do you need to fly to San Juan?

    The necessary travel and health documents for your San Juan trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Best airlines flying from United Kingdom to San Juan

Compare and see reviews for airlines that fly from United Kingdom to San Juan with momondo
Airline
Rating
Free Cancellation
Price
Virgin AtlanticPriceFrom £341Free CancellationRating
7.5
674 reviews
Search Virgin Atlantic flights
JetBluePriceFrom £450Free CancellationRating
7.2
2,902 reviews
Search JetBlue flights
FinnairPriceFrom £461Free CancellationRating
7.6
1,334 reviews
Search Finnair flights
IcelandairPriceFrom £486Free CancellationRating
7.0
581 reviews
Search Icelandair flights
IberiaPriceFrom £519Free CancellationRating
7.0
3,031 reviews
Search Iberia flights
British AirwaysPriceFrom £553Free CancellationRating
6.7
7,534 reviews
Search British Airways flights
Aer LingusPriceFrom £674Free CancellationRating
7.2
1,377 reviews
Search Aer Lingus flights
KLMPriceFrom £890Free CancellationRating
7.7
1,416 reviews
Search KLM flights

Why use momondo?

Why should I use momondo to find a flight deal from United Kingdom to San Juan?

Finding the right flight to San Juan from United Kingdom is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to San Juan quick and easy, saving you time and money.

Can I find flights from United Kingdom to San Juan with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to San Juan from United Kingdom with this policy.

How can momondo help me find flights from United Kingdom to San Juan?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to San Juan from United Kingdom.

I’m not ready to book a flight from United Kingdom to San Juan right now. Can momondo alert me if prices change?

If you are simply researching potential flights to San Juan, momondo offers a useful price alert feature which will track prices for flights to San Juan from United Kingdom and alert you when they change.

An easier way to manage your San Juan trip

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Find better results for your trip to Puerto Rico

Fly into one of these airports located in San Juan

Airports listed have a maximum distance of 7.1 mi from San Juan
San Juan Luis Munoz Marin Intl Airport