DAL (Dallas) to SEA (Seattle) flights arrive on time 76% of the time. The most reliable airline on this route is Alaska Airlines at 79%. The average delay is 49 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated March 2026.DAL → SEA
DAL (Dallas) to SEA (Seattle)
DAL → SEA on-time performance by month
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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 incoming plane arriving late.
Accurate?
Alaska Airlines is significantly more reliable on this route at 79% on time vs Southwest Airlines at 59%.
Airline Comparison
Alaska Airlines leads at 79% on time; Southwest Airlines trails at 59%.
Accurate?
Good to know
Departing from DAL
78% on timeTSA is currently ~5 min. Best time: 4 AM (about 5 min).
DAL cancels 2.1% of flights — higher than average. Have a backup plan.
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.