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).

MIA

% 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 MIA 8–9 am: 1Close ×


AA 654	MIA 08:20	SEA 11:56	6h 36m	72	94%	0.0%	68 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.


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