BOS (Boston) to IAD (Washington) flights arrive on time 84% of the time. The most reliable airline on this route is United Airlines at 84%. The average delay is 74 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated October 2026.BOS → IAD
BOS (Boston) to IAD (Washington)
BOS → IAD on-time performance by month
24
25
26
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
This route is on time most of the time. About 84% 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 — United Airlines leads slightly at 84% vs Republic Airways at 80%.
Airline Comparison
United Airlines leads at 84% on time; Republic Airways trails at 80%.
Accurate?
Good to know
Departing from BOS
77% on timeExpect ~20 min sitting on the taxiway after your gate pushes back. BOS has long runway queues.
TSA is currently ~33 min. Best time: 4 AM (about 5 min).
Arriving at IAD
82% on timeWhen flights into IAD are late, the average delay is 75 minutes. Build buffer if you have ground plans.
If connecting at IAD: TSA is ~8 min right now. Allow at least 60 minutes for a domestic connection.
Flight cancelled or delayed?
Check what United Airlines owes you — refund rights, action plan, complaint email. Free.
Flying out of BOS? 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.