Route Reliability

Route reliability

San Juan (SJU) to New York (JFK): which airline is most on time?

On-time arrivals, cancellations and long delays for every airline that reported nonstop flights from San Juan, PR (SJU) to New York, NY (JFK), September 2025 to August 2026.

Historical performance Official DOT data through August 2026 · Not live flight status

San Juan, PRNew York, NY

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Three-letter airport codes, nonstop U.S. domestic flights. One direction at a time.

Route at a glance · September 2025 to August 2026

SJU to JFK

San Juan, PR to New York, NY

On time
74.5%vs 75.6% U.S. average About average
Cancelled
3.9%vs 1.9% U.S. average Worse than average
60+ min late
8.4%vs 8.1% U.S. average About average
Scheduled flights
3,560in 12 months3 airlines
Most reliable airline
Delta Air Lines85.5% on time · 1,104 flights

On time about as often as the U.S. average, with more cancellations.

Compared with all U.S. flights, September 2025 to August 2026. “About average” means within 1.5 points for on time, 0.3 for cancelled and 1 for 60+ minutes late.

Airlines on this route

Ranked by on-time arrival

Airlines from SJU to JFK, September 2025 to August 2026. Rates are shares of all scheduled flights.
Airline On time Cancelled 60+ min late Avg delay when late Diverted Flights
1. Delta Air Lines Most reliable 85.5% 2.4% 4.0% 76 min 0.2% 1,104
2. Frontier Airlines Small sample (under 300 flights) 78.6% 2.4% 7.3% 68 min 1.0% 206
3. JetBlue Airways 68.8% 4.8% 10.7% 84 min 0.2% 2,250

On time = arrived within 15 minutes of schedule. Avg delay when late = average arrival delay of flights 15+ minutes late. "Most reliable" needs at least 300 flights in 12 months. Tap a heading to sort.

What this means

Delta Air Lines has the strongest record on this route.

  • Delta Air Lines had the best on-time record from San Juan (SJU) to New York (JFK): 85.5% of its 1,104 scheduled flights arrived within 15 minutes of schedule, compared with 68.8% for JetBlue Airways.
  • 3.9% of flights on this route were cancelled (about 1 in 26), 2.0 points higher than the U.S. average of 1.9%.
  • 8.4% of flights, about 1 in 12, arrived an hour or more late. When a flight was late (15+ minutes), the average arrival delay was 82 min.
  • Overall, 74.5% of flights on this route arrived on time, 1.1 points lower than the U.S. average of 75.6%.
  • Over the last 3 years, May was the most reliable month on this route (86.9% on time) and July the least reliable (65.4%).
  • Cancellations peaked in July, when 4.4% of flights were cancelled.
  • Flights scheduled to depart 7 am to 8 am were the most punctual (89.4% on time); flights scheduled to depart 8 pm to 9 pm were the least (47.5%).
  • In the other direction, New York (JFK) to San Juan (SJU), 67.6% of flights were on time and 3.6% were cancelled. Compare airlines JFK to SJU.

Best and worst months to fly SJU to JFK

Jan 74.2%
Feb 76.1%
Mar 75.8%
Apr 84.5%
May 86.9%
Jun 81.3%
Jul 65.4%
Aug 68.1%
Sep 81.4%
Oct 83.3%
Nov 81.7%
Dec 77.9%
Share of scheduled flights on time 12-month average 74.5%
All airlines combined, by calendar month, September 2023 to August 2026 (3 years pooled). Scale starts at zero.
Show as table
PeriodOn timeFlights
January 74.2% 911
February 76.1% 850
March 75.8% 968
April 84.5% 976
May 86.9% 867
June 81.3% 972
July 65.4% 1,047
August 68.1% 1,053
September 81.4% 727
October 83.3% 786
November 81.7% 901
December 77.9% 1,016
Best and worst calendar month by airline, September 2023 to August 2026.
AirlineBest monthWorst month
Delta Air Lines April (93.3%) July (79.6%)
Frontier Airlines October (92.5%) July (53.7%)
JetBlue Airways May (86.7%) August (61.4%)

Month by month, last 12 months

Sep 83.9%
Oct 81.8%
Nov 79.8%
Dec 74.4%
Jan 66.8%
Feb 65.3%
Mar 82.3%
Apr 83.9%
May 87.8%
Jun 82.7%
Jul 51.9%
Aug 60.1%
Share of scheduled flights on time U.S. average 75.6%
All airlines combined, September 2025 to August 2026. Scale starts at zero.
Show as table
PeriodOn timeFlights
Sep 2025 83.9% 248
Oct 2025 81.8% 269
Nov 2025 79.8% 297
Dec 2025 74.4% 351
Jan 2026 66.8% 310
Feb 2026 65.3% 294
Mar 2026 82.3% 305
Apr 2026 83.9% 310
May 2026 87.8% 254
Jun 2026 82.7% 289
Jul 2026 51.9% 310
Aug 2026 60.1% 323

Best and worst departure times

<6a 74.9%
6a 82.5%
7a 89.4%
8a 76.7%
9a 88.5%
10a 71.9%
11a 68.3%
12p 80.0%
1p 72.1%
2p 75.4%
3p 53.7%
4p Insufficient sample
5p 78.2%
6p 72.7%
7p 68.2%
8p 47.5%
9p 70.7%
10p 34.5%
11p Insufficient sample
Share of scheduled flights on time
By scheduled local departure hour at SJU, September 2025 to August 2026. Hours with no scheduled flights are omitted. Scale starts at zero.
Show as table
PeriodOn timeFlights
Departing before 6 am 74.9% 287
Departing 6 am to 7 am 82.5% 246
Departing 7 am to 8 am 89.4% 509
Departing 8 am to 9 am 76.7% 159
Departing 9 am to 10 am 88.5% 96
Departing 10 am to 11 am 71.9% 89
Departing 11 am to noon 68.3% 104
Departing noon to 1 pm 80.0% 75
Departing 1 pm to 2 pm 72.1% 430
Departing 2 pm to 3 pm 75.4% 297
Departing 3 pm to 4 pm 53.7% 149
Departing 4 pm to 5 pm Insufficient sample 19
Departing 5 pm to 6 pm 78.2% 252
Departing 6 pm to 7 pm 72.7% 399
Departing 7 pm to 8 pm 68.2% 176
Departing 8 pm to 9 pm 47.5% 118
Departing 9 pm to 10 pm 70.7% 75
Departing 10 pm to 11 pm 34.5% 55
Departing 11 pm to midnight Insufficient sample 25
Woman at an airport window watching a plane take off
Photo: Depositphotos (licensed stock, illustrative only). Credits

Sources & data dates

Source
U.S. DOT Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987-present)
Period
September 2025 to August 2026 (12 months); month-of-year patterns September 2023 to August 2026
Data through
August 2026
Processed
2026-11-03
Scope
Nonstop scheduled flights from San Juan, PR (SJU) to New York, NY (JFK), one direction. Airlines that report to the DOT only.
Method
Rates use all scheduled flights as the denominator; cancelled and diverted flights count as not on time. Figures based on fewer than 50 scheduled flights are suppressed. Full methodology.

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