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1,212 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 88% depart on time. After 4 pm it’s 7 in 10.

Best time to leave 8–9 am 94% arrive on time from MIA
Best single flight AS 305 MIA 18:20 → SEA 22:00 · 69% on time Avoid DL 506 MIA 18:26 → SEA 22:10 · 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).

7
8
9
10
11
12
13
14
15
16
17
18
19
20
MIA
79
94
57
72
69
70
% 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.
American 454 70% 0.4% 54 min
Alaska 392 69% 1.3% 50 min
Delta 366 63% 1.6% 96 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.
AS 305 MIA 18:20 SEA 22:00 69%
AA 3252 MIA 20:35 SEA 00:07 64%
DL 506 MIA 18:26 SEA 22:10 60%
All 5 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.
American MIA SEA 6h 36m 70% 0.4% 454 Flying now
Alaska MIA SEA 6h 44m 69% 1.3% 392 Flying now
Delta MIA SEA 6h 44m 63% 1.6% 366 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