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3,868 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 93% depart on time. After 4 pm it’s 57%.

Best time to leave 6–7 am 90% arrive on time from BOS
Best single flight UA 647 BOS 07:45 → DEN 10:19 · 91% on time Avoid B6 993 BOS 19:59 → DEN 22:41 · 60% 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
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20
BOS
93
95
92
89
85
85
70
69
70
89
70
39
56
45
65
% 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 372 85% 1.6% 48 min
United 1,897 83% 1.1% 67 min
JetBlue 685 71% 2.5% 63 min
Southwest 914 67% 1.0% 55 min

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.
UA 647 BOS 07:45 DEN 10:19 91%
UA 662 BOS 09:40 DEN 12:12 91%
UA 414 BOS 12:22 DEN 14:53 90%
UA 2297 BOS 15:10 DEN 17:55 86%
DL 499 BOS 07:45 DEN 10:19 85%
· · ·
UA 800 BOS 16:57 DEN 19:45 75%
B6 993 BOS 19:59 DEN 22:41 60%
All 15 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 DEN 4h 34m 85% 1.6% 372 Flying now
United BOS DEN 4h 35m 83% 1.1% 1,897 Flying now
JetBlue BOS DEN 4h 42m 71% 2.5% 685 Flying now
Southwest BOS DEN 4h 45m 67% 1.0% 914 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