BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
IAD→LAS

Washington, DC (IAD) to Las Vegas, NV (LAS) flight delay odds

84.7% of 1,108 official scheduled IAD-to-LAS flights arrived on time; 10.4% arrived at least 30 minutes late and 0.5% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

HISTORICAL ROUTE SIGNALLower disruption
84.7%arrived on time
10.4%30+ min late
0.5%cancelled
1,108scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late5.2%all scheduled flights
120+ minutes late2.5%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival-2.6 mincompleted flights

Which departure time was most reliable for IAD to LAS?

Among qualifying IAD-to-LAS departure window results, Late morning had the highest on-time rate: 88.5% of 234 flights. Night was lowest at 75.0% across 48 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning18285.2%11.5%1.6%
Late morning23488.5%6.0%0.0%
Afternoon31687.3%6.3%0.3%
Evening32880.5%15.5%0.3%
Night4875.0%18.8%0.0%

Which weekday was most reliable for IAD to LAS?

Among qualifying IAD-to-LAS weekday results, Wednesday had the highest on-time rate: 87.4% of 151 flights. Sunday was lowest at 81.5% across 162 flights.

DayFlightsOn time30+ minCancelled
Monday16381.6%15.3%0.6%
Tuesday14785.0%8.2%0.0%
Wednesday15187.4%9.3%0.0%
Thursday16386.5%9.2%0.0%
Friday16486.0%9.8%0.0%
Saturday15884.8%10.8%0.6%
Sunday16281.5%9.9%1.9%

Which airline was most reliable for IAD to LAS?

Among qualifying IAD-to-LAS airline results, United Airlines had the highest on-time rate: 86.3% of 1,009 flights. Frontier Airlines was lowest at 67.7% across 99 flights.

AirlineFlightsOn time30+ minCancelled
United Airlines1,00986.3%9.0%0.5%
Frontier Airlines9967.7%24.2%0.0%

Which month was most reliable for IAD to LAS?

Among qualifying IAD-to-LAS month results, April 2026 had the highest on-time rate: 95.1% of 81 flights. July 2025 was lowest at 70.7% across 123 flights.

MonthFlightsOn time30+ minCancelled
July 202512370.7%24.4%0.0%
August 202511979.0%13.4%0.0%
September 20259191.2%5.5%0.0%
October 20259387.1%8.6%0.0%
November 20258993.3%4.5%0.0%
December 20259291.3%6.5%0.0%
January 20269081.1%10.0%4.4%
February 20267490.5%5.4%0.0%
March 20268087.5%10.0%1.2%
April 20268195.1%2.5%0.0%
May 20268687.2%8.1%0.0%
June 20269071.1%17.8%0.0%

What drove IAD to LAS delay minutes?

Late aircraft was the largest recorded IAD-to-LAS delay category, accounting for 46.2% of 11,330 BTS-attributed delay minutes during July 2025–June 2026.

Airline23.1%
Late aircraft46.2%
National airspace18.5%
Weather12.3%
Security0.0%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.