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1,961 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 9 in 10 depart on time. After 4 pm it’s 3 in 5.

Best time to leave 5–6 am 87% arrive on time from SJU
Best single flight DL 1780 SJU 14:05 → BOS 18:14 · 80% on time Avoid B6 862 SJU 08:30 → BOS 12:33 · 69% 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
SJU
96
88
85
83
79
64
79
77
64
74
57
69
50
53
% 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
Boston flights leaving SJU 8–9 pm: 1Close ×
B6 462 SJU 20:35 BOS 00:46 4h 06m 89 58% 4.5% 101 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 78% 1.5% 71 min
JetBlue 1,384 70% 3.5% 78 min
Spirit 145 – 4.1% 61 min
Frontier 34 – 2.9% 45 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 SJU 14:05 BOS 18:14 80%
B6 562 SJU 06:00 BOS 10:05 80%
B6 862 SJU 08:30 BOS 12:33 69%
All 6 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 SJU BOS 4h 23m 78% 1.5% 398 Flying now
JetBlue SJU BOS 4h 08m 70% 3.5% 1,384 Flying now
Spirit SJU BOS 4h 24m 74% 4.1% 145 Not flying now
Frontier SJU BOS 4h 19m 70%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