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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
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
BOS
88
92
90
85
73
69
75
71
50
69
60
51
35
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

Pick an hour to see this route’s flights leaving then.

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 in the current schedule

Every flight that flew in the Jun 6 – Jul 31, 2026 schedule, with its record over Aug 2025 – Jul 2026. Times are local. Click a column to sort.
B6 761 BOS 06:00 SJU 10:00 4h 00m 104 79% 3.8% 69 min
DL 1780 BOS 08:50 SJU 12:54 4h 04m 365 78% 1.1% 51 min
B6 861 BOS 09:40 SJU 13:42 4h 01m 364 75% 2.7% 65 min
B6 261 BOS 12:35 SJU 16:37 4h 00m 122 68% 0.8% 74 min
B6 561 BOS 21:44 SJU 02:17 4h 00m 274 51% 3.6% 72 min

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