tailodds FORECAST
Tickets
Any day
2,502 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

No clear winner: airlines and hours on this route all land within a few points of 3 in 4 on time.

Best time to leave 7–8 am 89% arrive on time from SEA
Best single flight DL 459 SEA 07:29 → BOS 16:00 · 88% on time Avoid B6 398 SEA 11:45 → BOS 20:13 · 55% 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
20
21
22
23
SEA
90
78
82
56
57
71
70
78
75
% 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 SEA 4–5 pm: 1Close ×
DL 474 SEA 16:00 BOS 00:21 5h 21m 226 71% 1.8% 83 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 1,034 81% 1.6% 72 min
Alaska 1,221 76% 1.0% 51 min
JetBlue 247 55% 1.6% 89 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.
DL 459 SEA 07:29 BOS 16:00 88%
DL 473 SEA 23:15 BOS 07:35 82%
AS 460 SEA 15:36 BOS 23:59 80%
AS 536 SEA 23:18 BOS 07:40 78%
AS 306 SEA 08:23 BOS 16:53 76%
· · ·
DL 474 SEA 16:00 BOS 00:21 71%
B6 398 SEA 11:45 BOS 20:13 55%
All 13 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 SEA BOS 5h 26m 81% 1.6% 1,034 Flying now
Alaska SEA BOS 5h 27m 76% 1.0% 1,221 Flying now
JetBlue SEA BOS 5h 28m 55% 1.6% 247 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