MIA (Miami) to SEA (Seattle) flights arrive on time 70% of the time. The most reliable airline on this route is Alaska Airlines at 73%. The average delay is 69 minutes. Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Source: Bureau of Transportation Statistics. Updated March 2026.MIA → SEA
MIA (Miami) to SEA (Seattle)
MIA → SEA on-time performance by month
24
25
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
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This route is delayed fairly often. About 70% of flights arrive on schedule.
Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Accurate?
Alaska Airlines edges out Delta Air Lines on this route — 73% vs 67% on time.
Airline Comparison
Alaska Airlines leads at 73% on time; Delta Air Lines trails at 67%.
Accurate?
Good to know
Departing from MIA
76% on timeExpect ~19 min sitting on the taxiway after your gate pushes back. MIA has long runway queues.
TSA is currently ~5 min. Best time: 4 AM (about 5 min).
Arriving at SEA
82% on timeWhen flights into SEA are late, the average delay is 57 minutes. Build buffer if you have ground plans.
If connecting at SEA: TSA is ~5 min right now. Allow at least 60 minutes for a domestic connection.
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Data last updated March 2026. Source: Bureau of Transportation Statistics.