DFW (Dallas) to SEA (Seattle) flights arrive on time 72% of the time. The most reliable airline on this route is Delta Air Lines at 84%. The average delay is 64 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated April 2026.DFW → SEA
DFW (Dallas) to SEA (Seattle)
DFW → SEA on-time performance by month
24
25
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
This route is delayed fairly often. About 72% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
Delta Air Lines is significantly more reliable on this route at 84% on time vs Frontier Airlines at 66%.
Airline Comparison
Delta Air Lines leads at 84% on time; Frontier Airlines trails at 66%.
Accurate?
Good to know
Departing from DFW
77% on timeExpect ~18 min sitting on the taxiway after your gate pushes back. DFW has long runway queues.
TSA is currently ~20 min. Best time: 4 AM (about 5 min).
DFW cancels 2.5% 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 ~22 min right now. Allow at least 60 minutes for a domestic connection.
Flight cancelled or delayed?
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Data last updated April 2026. Source: Bureau of Transportation Statistics.