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

Washington, DC (IAD) to Los Angeles, CA (LAX) flight delay odds

80.9% of 2,454 official scheduled IAD-to-LAX flights arrived on time; 10.1% arrived at least 30 minutes late and 0.9% 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
80.9%arrived on time
10.1%30+ min late
0.9%cancelled
2,454scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late5.5%all scheduled flights
120+ minutes late2.3%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+0.8 mincompleted flights

Which departure time was most reliable for IAD to LAX?

Among qualifying IAD-to-LAX departure window results, Afternoon had the highest on-time rate: 87.1% of 599 flights. Evening was lowest at 71.7% across 834 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning59285.8%5.2%1.2%
Late morning9287.0%8.7%3.3%
Afternoon59987.1%6.5%0.5%
Evening83471.7%17.3%1.0%
Night33782.2%8.0%0.6%

Which weekday was most reliable for IAD to LAX?

Among qualifying IAD-to-LAX weekday results, Tuesday had the highest on-time rate: 83.0% of 342 flights. Thursday was lowest at 78.0% across 364 flights.

DayFlightsOn time30+ minCancelled
Monday36482.7%9.1%0.3%
Tuesday34283.0%7.9%0.3%
Wednesday33981.1%10.6%0.3%
Thursday36478.0%10.4%1.9%
Friday36782.6%10.4%1.1%
Saturday32480.2%10.8%0.3%
Sunday35478.5%11.9%2.3%

Which airline was most reliable for IAD to LAX?

Among qualifying IAD-to-LAX airline results, United Airlines had the highest on-time rate: 82.2% of 2,320 flights. Alaska Airlines was lowest at 34.0% across 50 flights.

AirlineFlightsOn time30+ minCancelled
United Airlines2,32082.2%9.4%1.0%
American Airlines8472.6%10.7%0.0%
Alaska Airlines5034.0%44.0%0.0%

Which month was most reliable for IAD to LAX?

Among qualifying IAD-to-LAX month results, September 2025 had the highest on-time rate: 89.7% of 174 flights. July 2025 was lowest at 58.9% across 224 flights.

MonthFlightsOn time30+ minCancelled
July 202522458.9%29.5%1.8%
August 202519678.6%11.2%0.5%
September 202517489.7%3.4%0.6%
October 202520289.1%4.0%0.5%
November 202519886.4%7.1%0.5%
December 202521585.1%7.0%0.9%
January 202617473.0%11.5%4.6%
February 202615879.1%12.0%0.0%
March 202618484.8%9.2%0.0%
April 202622479.5%7.6%0.4%
May 202625287.3%6.7%0.4%
June 202625380.2%11.1%1.2%

What drove IAD to LAX delay minutes?

Airline was the largest recorded IAD-to-LAX delay category, accounting for 35.8% of 27,671 BTS-attributed delay minutes during July 2025–June 2026.

Airline35.8%
Late aircraft35.1%
National airspace21.1%
Weather8.0%
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.