SEA (Seattle) to DAL (Dallas) flights arrive on time 74% of the time. The most reliable airline on this route is Alaska Airlines at 82%. The average delay is 45 minutes. Delays on this route are most often caused by the airline (crew, maintenance, or boarding).
Source: Bureau of Transportation Statistics. Updated October 2026.SEA → DAL
SEA (Seattle) to DAL (Dallas)
SEA → DAL on-time performance by month
24
25
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JanFebMarAprMayJunJulAugSepOctNovDec
Worse
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This route is delayed fairly often. About 74% 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 52%.
Airline Comparison
Alaska Airlines leads at 82% on time; Southwest Airlines trails at 52%.
Accurate?
Good to know
Departing from SEA
81% on timeExpect ~20 min sitting on the taxiway after your gate pushes back. SEA has long runway queues.
TSA is currently ~27 min. Best time: 4 AM (about 5 min).
Arriving at DAL
78% on timeWhen flights into DAL are late, the average delay is 56 minutes. Build buffer if you have ground plans.
If connecting at DAL: TSA is ~26 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 October 2026. Source: Bureau of Transportation Statistics.