1,210 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 65%.

Best time to leave 7–8 am 89% arrive on time from SEA

Best single flight AS 305 SEA 08:12 → MIA 17:17 · 80% on time Avoid AA 1471 SEA 20:45 → MIA 05:37 · 74% 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).

SEA

% 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

Miami flights leaving SEA 12–1 pm: 1Close ×


AA 654	SEA 12:56	MIA 21:55	5h 59m	72	80%	1.4%	84 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.


Alaska	391	81%	0.5%	39 min
Delta	365	80%	1.4%	63 min
American	454	77%	0.9%	72 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	SEA 08:12	MIA 17:17	80%
DL 506	SEA 08:25	MIA 17:31	80%
AA 1471	SEA 20:45	MIA 05:37	74%

All 4 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.


Alaska	SEA	MIA	5h 59m	81%	0.5%	391	Flying now
Delta	SEA	MIA	6h 06m	80%	1.4%	365	Flying now
American	SEA	MIA	5h 52m	77%	0.9%	454	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