BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
JFK→SJU

New York, NY (JFK) to San Juan, PR (SJU) flight delay odds

69.2% of 3,651 official scheduled JFK-to-SJU flights arrived on time; 19.4% arrived at least 30 minutes late and 2.6% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

HISTORICAL ROUTE SIGNALVariable
69.2%arrived on time
19.4%30+ min late
2.6%cancelled
3,651scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late10.7%all scheduled flights
120+ minutes late4.4%all scheduled flights
Diverted0.2%did not reach as scheduled
Average arrival+12.5 mincompleted flights

Which departure time was most reliable for JFK to SJU?

Among qualifying JFK-to-SJU departure window results, Early morning had the highest on-time rate: 76.8% of 980 flights. Night was lowest at 62.1% across 322 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning98076.8%11.5%2.8%
Late morning53462.7%23.4%2.2%
Afternoon92773.5%17.9%2.2%
Evening88862.6%24.5%2.8%
Night32262.1%27.0%3.7%

Which weekday was most reliable for JFK to SJU?

Among qualifying JFK-to-SJU weekday results, Tuesday had the highest on-time rate: 73.7% of 517 flights. Thursday was lowest at 63.5% across 524 flights.

DayFlightsOn time30+ minCancelled
Monday52770.2%20.1%4.7%
Tuesday51773.7%15.7%2.5%
Wednesday50573.3%18.2%0.6%
Thursday52463.5%23.9%0.6%
Friday52772.5%16.1%2.1%
Saturday52167.6%19.8%3.8%
Sunday53063.6%22.1%4.0%

Which airline was most reliable for JFK to SJU?

Among qualifying JFK-to-SJU airline results, Delta Air Lines had the highest on-time rate: 77.1% of 1,104 flights. Frontier Airlines was lowest at 54.3% across 315 flights.

AirlineFlightsOn time30+ minCancelled
JetBlue Airways2,23267.3%21.0%2.9%
Delta Air Lines1,10477.1%13.6%2.0%
Frontier Airlines31554.3%28.9%2.9%

Which month was most reliable for JFK to SJU?

Among qualifying JFK-to-SJU month results, May 2026 had the highest on-time rate: 81.9% of 254 flights. January 2026 was lowest at 59.9% across 309 flights.

MonthFlightsOn time30+ minCancelled
July 202537163.3%23.5%3.0%
August 202535962.7%24.0%0.8%
September 202524572.7%17.6%0.0%
October 202527162.0%26.2%0.7%
November 202529773.7%18.5%1.0%
December 202535065.1%21.4%4.6%
January 202630959.9%21.0%9.4%
February 202629462.2%21.4%8.5%
March 202630274.8%18.5%1.0%
April 202631079.0%12.6%0.0%
May 202625481.9%11.4%0.4%
June 202628977.9%13.8%1.0%

What drove JFK to SJU delay minutes?

Airline was the largest recorded JFK-to-SJU delay category, accounting for 37.7% of 75,651 BTS-attributed delay minutes during July 2025–June 2026.

Airline37.7%
Late aircraft35.3%
National airspace24.6%
Weather1.8%
Security0.6%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.