Exceptional1 stop · 17.5h
BOS to BKKThailand
Bangkok
$506
usually $1,140
−56%
Most monthly lows $915–$1,187. Cheaper than every other month on record (5).
- Travel dates
- 7 Mar '27 – 17 Apr '27 · 41 nights
- Airline
Turkish Airlines· $18 per 1,000 km
Flights · BOS → SJO
Boston to San José
Best fare, round trip
$398
Too little price history on this route to compare — the fare is shown as found.
Found
- Depart
- Mon 2 Nov
- Return
- Thu 12 Nov
- Stay
- 10 nights
- Flight
- 2 stops · 10h
- Airline
American
Cached fare — the booking search re-prices live before you pay.
Costa RicaSan JoséNobody comes for the capital — they come for two coasts, volcanoes and cloud forest, all within four hours.Best windowDec–AprAirportsJuan Santamaría (SJO)Every route into San JoséFare seasonality
When this route gets cheap.
The cheapest itinerary we are tracking makes 2 stops and takes about 10 hours outbound, on a 10-night trip — ticketed under American, which on a connecting fare need not operate every leg. At $398 for 3,823 km each way, that works out to about $52 per 1,000 km flown. That is above the $43 per 1,000 km typical of medium-haul fares here. Across the 6 departure cities we track at a similar distance from San José, this fare ranks 3rd — 60% above the $249 from New York. We have 2 months of cached prices for this route so far — not enough to call a fare cheap or expensive, so we publish the price without a percentage. Fare history here is still too short to name a cheap season. The best time to be in San José: Dec–Apr.
The 2 days we hold a cached fare for
Press a date to compare its fares
The median cached fare across this calendar is 19% higher than when tracking began on 8 Aug — $407 then versus $486 now, across 15 recorded snapshots. This is a calendar-level trend, so an individual deal above can be lower. The lowest single day we have seen here is $365, on 26 Oct.
These are the only days we have a cached price for on this route so far — not the only days it flies. The search above covers any date.
Cached fares · checked 17 Oct 2026
We are still collecting this route's months — 2 months of cached prices so far, too few to chart.
Route facts
- Airports
- Logan (BOS) ↔ Juan Santamaría (SJO)
- Flight time
- ≈10 hours outbound
- Distance
- ≈3,823 km each way
- Airlines on the board
- American
- Itineraries
- Connections on current fares
- Best months to visit
- Dec–Apr
Good to know
BOS → SJO, answered.
How far in advance should I book BOS → San José?
We do not publish a number for this, because we cannot measure it yet. Answering it honestly means watching the same departure date on this route over many weeks as it approaches, and that archive is still filling up — so any "book N days ahead" figure here would be borrowed from somewhere else rather than measured. Our guide Why flight prices change covers the levers we can measure.
Are there nonstop flights from Boston to San José?
The current cheapest fares involve a connection, ticketed under American. We hold no nonstop fare on this route right now, which does not mean none flies — search your exact dates to see what does.
Are these prices guaranteed?
No — these are cached fares found on real searches (this one on 17 October). Airlines reprice constantly, so the booking search re-checks the live price before you pay. Fresher finds are far more likely to still be available.
Next step
Sleeping in San José?
Lock the flight first — then compare stays for 2–12 Nov · 10 nights.
Browse hotelsMissed it?
Cached fares expire. This route has a feed of its own — follow it and the next BOS → SJO drop reaches you as soon as we find it.
Follow this route’s feedKeep browsing
Related routes on the board.
Rare1 stop · 17h
BOS to TYOJapan
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$910
usually $1,730
−47%
Most monthly lows $1,262–$1,730. Cheaper than every other month on record (3).
GreatNonstop · 8.5h
BOS to ISTTürkiye
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$518
usually $800
−35%
Most monthly lows $760–$892. Cheaper than every other month on record (8).
Rare1 stop · 7h
NYC to SJOUnited States
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$249
usually $480
−48%
Most monthly lows $302–$492. Cheaper than every other month on record (5).
Great3 stops · 17h
IST to SJOTürkiye
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$865
usually $1,325
−35%
Most monthly lows $978–$1,334. Cheaper than every other month on record (11).
Good1 stop · 4.5h
MIA to SJOUnited States
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$423
usually $545
−22%
Most monthly lows $530–$647. Cheaper than every other month on record (4).