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Boston to San Juan in January 2027 BOS → SJU

Logan International Airport (BOS) → Luis Munoz Marin International Airport (SJU)

For departures in January 2027, the cheapest return found recently is $266 with Frontier Airlines, 10 Jan 2027 – 14 Jan 2027, found today.

Return

In January 2027, the cheapest return fare on each of 7 departure dates is usually $341 to $453. Across all 11 departure dates we hold on this route, it is usually $367 to $444. Of the 2 months with enough return fares to compare, January 2027 is usually the most expensive.

Cheapest return found recently

$266

10 Jan 2027 – 14 Jan 2027 · Frontier Airlines

Logan International Airport (BOS) → Luis Munoz Marin International Airport (SJU)

out nonstop, back 1 stop

found today

See prices for these datesCheck today's price

It is also the cheapest return we hold, of any age.

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The cheapest dates in January 2027

DatesFromAirlineStopsFound
10 Jan 2027 – 14 Jan 2027$266Frontier Airlinesout nonstop, back 1 stopfound todaySee prices for these dates
8 Jan 2027 – 14 Jan 2027$301Frontier Airlinesout nonstop, back 1 stopfound 3 days agoSee prices for these dates
11 Jan 2027 – 14 Jan 2027$380Frontier Airlinesout nonstop, back 1 stopfound 3 days agoSee prices for these dates
15 Jan 2027 – 18 Jan 2027$384Frontier Airlinesout 1 stop, back 1 stopfound 3 days agoSee prices for these dates
23 Jan 2027 – 26 Jan 2027$436Allegiant Airout 1 stop, back nonstopfound 5 days agoSee prices for these dates

Every date we hold

7 departure dates

8 Jan 2027 – 14 Jan 2027: $301, found 3 days ago10 Jan 2027 – 14 Jan 2027: $266, found today11 Jan 2027 – 14 Jan 2027: $380, found 3 days ago15 Jan 2027 – 18 Jan 2027: $384, found 3 days ago22 Jan 2027 – 26 Jan 2027: $469, found 5 days ago23 Jan 2027 – 26 Jan 2027: $436, found 5 days ago29 Jan 2027 – 1 Feb 2027: $499, found 4 days agoJan
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
8 Jan 2027 – 14 Jan 2027$301Frontier AirlinesLogan International Airport (BOS) → Luis Munoz Marin International Airport (SJU)out nonstop, back 1 stopfound 3 days agoSee prices for these dates
10 Jan 2027 – 14 Jan 2027$266Frontier AirlinesLogan International Airport (BOS) → Luis Munoz Marin International Airport (SJU)out nonstop, back 1 stopfound todaySee prices for these dates
11 Jan 2027 – 14 Jan 2027$380Frontier AirlinesLogan International Airport (BOS) → Luis Munoz Marin International Airport (SJU)out nonstop, back 1 stopfound 3 days agoSee prices for these dates
15 Jan 2027 – 18 Jan 2027$384Frontier AirlinesLogan International Airport (BOS) → Luis Munoz Marin International Airport (SJU)out 1 stop, back 1 stopfound 3 days agoSee prices for these dates
22 Jan 2027 – 26 Jan 2027$469jetBlueLogan International Airport (BOS) → Luis Munoz Marin International Airport (SJU)out nonstop, back nonstopfound 5 days agoSee prices for these dates
23 Jan 2027 – 26 Jan 2027$436Allegiant AirLogan International Airport (BOS) → Luis Munoz Marin International Airport (SJU)out 1 stop, back nonstopfound 5 days agoSee prices for these dates
29 Jan 2027 – 1 Feb 2027$499jetBlueLogan International Airport (BOS) → Luis Munoz Marin International Airport (SJU)out nonstop, back nonstopfound 4 days agoSee prices for these dates

Which month looks cheapest?

January 2027 is the cheapest month — from $266.

November 2026From $3603 departure dates11 Nov – 14 Nov · found 6 days agoSee prices for these dates
January 2027From $266Cheapest seen7 departure dates10 Jan 2027 – 14 Jan 2027 · found todaySee prices for these dates
February 2027From $4031 departure date6 Feb 2027 – 10 Feb 2027 · found 4 days agoSee prices for these dates

Prices are what travelers' searches on Aviasales found in the last 7 days, in US dollars: the price the seller showed on Aviasales; bags may cost extra. Fares change, so check today's price before you book. How our prices work