BUF to SJU flight delays & on-time performance
Nonstop flights from Buffalo Niagara International Airport to Luis Munoz Marin International Airport · 1,845 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at BUF or SJU right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Buffalo (BUF) to San Juan (SJU) arrived on time 85% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 1.4% were cancelled, and 4% arrived an hour or more late.
- JetBlue is the only airline reporting nonstop flights on this route.
- Friday was the most reliable day to fly (100% on time) and Wednesday the least (72%).
- The largest source of delay minutes was late-arriving aircraft (44%).
Which airline is most on time from BUF to SJU?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| JetBlue | 85% | 1.4% | 10 min | 4.2% | 73 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
Not enough departures across different hours to compare.
Best day of the week
On-time arrival rate by day of departure.
- Monday82%5.6% cancelled
- Wednesday72%0.0% cancelled
- Friday100%0.0% cancelled
- Saturday83%0.0% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft44%
- Air traffic control & airport congestion38%
- Airline (crew, maintenance, cleaning, fueling)18%
- Extreme weather0%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Airline (crew, maintenance, cleaning, fueling)100%
- Extreme weather0%
- Air traffic control & airport congestion0%
- Security0%
BUF to SJU: common questions
- How often are BUF to SJU flights on time?
- 85% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Buffalo to San Juan cancelled?
- 1.4% of scheduled flights were cancelled (1 of 73).
- How long are typical delays?
- Across all flights the average arrival delay was 10 min (early arrivals count as zero). Flights that were late arrived 54 min behind schedule on average, and 4.2% of flights were an hour or more late.
- How long is taxi time at BUF?
- Flights on this route spent 13 min taxiing from the gate to takeoff on average.
Related routes
Return trip: SJU to BUF — 85% on time
More flights from Buffalo
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: BUF → SJU, nonstop flights by US airlines that report to the DOT. How we calculate this.