JetBlue AirwaysB6
Flights B6634 varies Mo We Sa
live
Direct flights from San Juan (SJU) to Buffalo (BUF): 3 nonstop departures observed each week across 1 airline. The median arrival is 19 minutes late. No cancellations were recorded across the 2 tracked flights. The nonstop covers 2,976 km, an estimated 4 hours 19 minutes in the air. Measured by Pro Flight Search from live flight boards at San Juan and Buffalo. Updated 13 September 2026 at 02:18 UTC.
SJU
San Juan
smooth · +12
BUF
Buffalo
smooth · +0
2,976 km · ~4h 19m est.
Running clean · 1 airline · 3x weekly · nonstop
73 / 100
route health from live SJU and BUF delay boards
Median arrival delay is +19 min. 0 of 2 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →
Median arrival+19 minacross the last 2 operated legs
Flight time~4h 19mestimated from route distance
Weekly departures3x1 direct airline on the leg
Who flies it
observed on the boards · 7 daysHistory
operated legs · board outcomesActual board outcomes rather than schedules, paired departure and arrival per flight and day.
Full board history, day by day →
Airports right now
live boardsWeather lens
Current conditions put the pressure at SJU and BUF: 48% odds of a 15+ minute delay and around +15 min expected when it bites, measured from this route's own weather-matched delay history. See live delays → · Weather risk by airport →
next sweep in 120s
How the San Juan to Buffalo route actually runs
Pro Flight Search records official board updates for nonstop SJU to BUF flights through the day: schedules, estimates, gate pushes and actual departures. The verdict above comes from operated flights, so it reflects what this route does rather than what the timetable promises.
Planning around a delay? Live airport delays · Weather delay risk map · Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
Cite this data
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Suggested citation
Pro Flight Search — San Juan (SJU) to Buffalo (BUF) route reliability, measured from operated flights on official airport boards.
Canonical URL
How we measure this →
https://proflightsearch.com/search-flights/SJU-BUF
SJU to BUF questions
Is SJU–BUF running on time right now?
Mostly on schedule. The departure side at SJU is the weaker end, route health score 73/100. The airports section above carries the live status and delay window at both ends.
How long is the flight from SJU to BUF?
Great-circle distance is 2,976 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 240–285 min gate-to-gate on this route.
How often does SJU–BUF fly?
JetBlue Airways runs the route with about 3 flights a week (mon, wed, sat). Since one carrier owns the route, a single disruption tends to ripple through the day.
What does the route health score measure?
A blend of departure-side delay at SJU and arrival-side delay at BUF, computed from rolling delay windows (refreshed every 40 minutes) with a daily-rollup fallback. Current MVFR, IFR, or LIFR endpoint weather caps the score when flight rules can limit throughput. Higher is healthier: 100 means operations are clean at both ends.
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