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2,504 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 7 in 10.

Best time to leave 4–5 pm 83% arrive on time from BOS
Best single flight B6 397 BOS 07:10 → SEA 10:34 · 89% on time Avoid DL 324 BOS 19:25 → SEA 22:49 · 67% 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).

7
8
9
10
11
12
13
14
15
16
17
18
19
BOS
89
86
88
72
78
66
70
63
% 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
Seattle flights leaving BOS 5–6 pm: 1Close ×
AS 304 BOS 17:56 SEA 21:26 6h 30m 71 66% 0.0% 53 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.
JetBlue 247 79% 1.2% 72 min
Delta 1,035 73% 1.4% 57 min
Alaska 1,222 72% 1.1% 51 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.
B6 397 BOS 07:10 SEA 10:34 89%
AS 537 BOS 09:01 SEA 12:18 84%
DL 332 BOS 11:29 SEA 14:50 78%
DL 384 BOS 07:45 SEA 11:01 77%
AS 459 BOS 07:03 SEA 10:26 75%
· · ·
DL 324 BOS 19:25 SEA 22:49 67%
All 14 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.
JetBlue BOS SEA 6h 25m 79% 1.2% 247 Flying now
Delta BOS SEA 6h 25m 73% 1.4% 1,035 Flying now
Alaska BOS SEA 6h 22m 72% 1.1% 1,222 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