SEA (Seattle) to DAL (Dallas) flights arrive on time 76% of the time. The most reliable airline on this route is Alaska Airlines at 82%. The average delay is 42 minutes. Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Source: Bureau of Transportation Statistics. Updated March 2026.SEA → DAL
SEA (Seattle) to DAL (Dallas)
SEA → DAL on-time performance by month
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JanFebMarAprMayJunJulAugSepOctNovDec
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This route is on time most of the time. About 76% 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 82% on time vs Southwest Airlines at 62%.
Airline Comparison
Alaska Airlines leads at 82% on time; Southwest Airlines trails at 62%.
Accurate?
Good to know
Departing from SEA
82% on timeExpect ~19 min sitting on the taxiway after your gate pushes back. SEA has long runway queues.
TSA is currently ~5 min. Best time: 4 AM (about 5 min).
Arriving at DAL
78% on timeWhen flights into DAL are late, the average delay is 55 minutes. Build buffer if you have ground plans.
If connecting at DAL: TSA is ~5 min right now. Allow at least 60 minutes for a domestic connection.
DAL has a 2.1% cancellation rate — keep the airline app handy for rebooking.
Flight cancelled or delayed?
Check what Alaska Airlines owes you — refund rights, action plan, complaint email. Free.
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Data last updated March 2026. Source: Bureau of Transportation Statistics.