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1,770 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 87% depart on time. After 4 pm it’s 56%.

Best time to leave 6–7 am 82% arrive on time from BOS
Best single flight DL 1780 BOS 08:50 → SJU 12:54 · 78% on time Avoid B6 561 BOS 21:44 → SJU 02:17 · 51% on time

Time of day × airport

Share of this route’s flights leaving within 15 minutes, by airport and scheduled departure hour, over Aug 2025 – Jul 2026. Blank: no flights then (or fewer than 40 in the year).

5
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BOS
88
90
69
71
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69
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51
59
% of this route’s flights leaving within 15 min (small number: flights in the Jun 6 – Jul 31, 2026 schedule): 85+75–8465–7455–64under 55
San Juan flights leaving BOS 9–10 pm: 1Close ×
B6 561 BOS 21:44 SJU 02:17 4h 00m 274 51% 3.6% 72 min

Airlines on this route

Arriving within 15 minutes. Regional flights count under the airline that sells them. Pick an airline to see its flights.

Delta 398 76% 1.5% 58 min
JetBlue 1,192 68% 2.8% 72 min
Spirit 146 – 8.2% 109 min
Frontier 34 – 2.9% 119 min

Dimmed: fewer than 150 flights in the year, too few to rank.

Flights, best and worst

Flights in the Jun 6 – Jul 31, 2026 schedule that ran 150+ times in the year. Times are local. Pick a flight for its history.

DL 1780 BOS 08:50 SJU 12:54 78%
B6 861 BOS 09:40 SJU 13:42 75%
B6 561 BOS 21:44 SJU 02:17 51%
All 5 flights on this route →

Nonstops by airline and airport

Arriving within 15 minutes, Aug 2025 – Jul 2026. Pick a row to see that airline’s flights on that airport pair.

Delta BOS SJU 4h 04m 76% 1.5% 398 Flying now
JetBlue BOS SJU 4h 02m 68% 2.8% 1,192 Flying now
Spirit BOS SJU 4h 07m 54% 8.2% 146 Not flying now
Frontier BOS SJU 3h 59m 45%few flights 2.9% 34 Not flying now
Flying on a particular day? Pick a date above and the same ranking uses our forecast odds for each flight that day: Tomorrow.

About this data: US DOT on-time records, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. Schedules (which flights and connections exist, and their times) are as of Jun 6 – Jul 31, 2026; seasonal flights outside that window aren’t ranked. Rebuilt monthly. JSON