SEA (Seattle) to DAL (Dallas) flights arrive on time 70% of the time. The most reliable airline on this route is Alaska Airlines at 81%. The average delay is 47 minutes. Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Source: Bureau of Transportation Statistics. Updated August 2026.SEA → DAL
SEA (Seattle) to DAL (Dallas)
SEA → DAL on-time performance by month
24
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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 is significantly more reliable on this route at 81% on time vs Southwest Airlines at 57%.
Airline Comparison
Alaska Airlines leads at 81% on time; Southwest Airlines trails at 57%.
Accurate?
Good to know
Departing from SEA
80% on timeExpect ~21 min sitting on the taxiway after your gate pushes back. SEA has long runway queues.
TSA is currently ~22 min. Best time: 4 AM (about 5 min).
Arriving at DAL
79% on timeWhen flights into DAL are late, the average delay is 58 minutes. Build buffer if you have ground plans.
If connecting at DAL: TSA is ~22 min right now. Allow at least 60 minutes for a domestic connection.
Flight cancelled or delayed?
Check what Alaska Airlines owes you — refund rights, action plan, complaint email. Free.
Flying out of SEA? We'll brief you.
Delays, TSA, weather, gates — we'll let you know if something matters.
Know someone flying soon?
Send them the link — delay data, TSA waits, weather, all free.
Data last updated August 2026. Source: Bureau of Transportation Statistics.