BWI (Baltimore) to SEA (Seattle) flights arrive on time 71% of the time. The most reliable airline on this route is Alaska Airlines at 71%. The average delay is 55 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated October 2026.BWI → SEA
BWI (Baltimore) to SEA (Seattle)
BWI → SEA on-time performance by month
24
25
26
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
This route is delayed fairly often. About 71% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
Airlines are roughly equal on this route — Alaska Airlines leads slightly at 71% vs Southwest Airlines at 68%.
Airline Comparison
Alaska Airlines leads at 71% on time; Southwest Airlines trails at 68%.
Accurate?
Good to know
Departing from BWI
79% on timeTSA is currently ~14 min. Best time: 4 AM (about 5 min).
Arriving at SEA
81% on timeWhen flights into SEA are late, the average delay is 58 minutes. Build buffer if you have ground plans.
If connecting at SEA: TSA is ~27 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 BWI? 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.