LAS (Las Vegas) to IAD (Washington) flights arrive on time 86% of the time. The most reliable airline on this route is United Airlines at 86%. The average delay is 70 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated May 2026.LAS → IAD
LAS (Las Vegas) to IAD (Washington)
LAS → IAD on-time performance by month
24
25
JanFebMarAprMayJunJulAugSepOctNovDec
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This route is usually on time. About 86% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
United Airlines edges out Frontier Airlines on this route — 86% vs 73% on time.
Airline Comparison
United Airlines leads at 86% on time; Frontier Airlines trails at 73%.
Accurate?
Good to know
Departing from LAS
77% on timeExpect ~17 min sitting on the taxiway after your gate pushes back. LAS has long runway queues.
TSA is currently ~15 min. Best time: 4 AM (about 5 min).
Arriving at IAD
83% on timeWhen flights into IAD are late, the average delay is 74 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.
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Data last updated May 2026. Source: Bureau of Transportation Statistics.