SJU to BUF flight delays & on-time performance
Nonstop flights from Luis Munoz Marin International Airport to Buffalo Niagara International Airport · 1,845 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at SJU or BUF right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from San Juan (SJU) to Buffalo (BUF) arrived on time 85% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 1.4% were cancelled, and 6% arrived an hour or more late.
- JetBlue is the only airline reporting nonstop flights on this route.
- Departures scheduled around 7pm did best (91% on time); around 6pm did worst (81%).
- Monday was the most reliable day to fly (89% on time) and Saturday the least (82%).
- The largest source of delay minutes was late-arriving aircraft (71%).
Which airline is most on time from SJU to BUF?
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% | 14 min | 5.6% | 73 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 6pm81%49 flights
- 7pm91%22 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday89%0.0% cancelled
- Wednesday83%0.0% cancelled
- Friday84%0.0% cancelled
- Saturday82%5.6% 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 aircraft71%
- Airline (crew, maintenance, cleaning, fueling)22%
- Air traffic control & airport congestion7%
- Extreme weather0%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Air traffic control & airport congestion100%
- Airline (crew, maintenance, cleaning, fueling)0%
- Extreme weather0%
- Security0%
SJU to BUF: common questions
- How often are SJU to BUF 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 San Juan to Buffalo cancelled?
- 1.4% of scheduled flights were cancelled (1 of 73).
- How long are typical delays?
- Across all flights the average arrival delay was 14 min (early arrivals count as zero). Flights that were late arrived 87 min behind schedule on average, and 5.6% of flights were an hour or more late.
- How long is taxi time at SJU?
- Flights on this route spent 12 min taxiing from the gate to takeoff on average.
Related routes
Return trip: BUF to SJU — 85% on time
More flights from San Juan
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: SJU → BUF, nonstop flights by US airlines that report to the DOT. How we calculate this.