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

Washington, DC (IAD) to San Diego, CA (SAN) flight delay odds

82.7% of 1,400 official scheduled IAD-to-SAN flights arrived on time; 9.9% arrived at least 30 minutes late and 0.4% 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
82.7%arrived on time
9.9%30+ min late
0.4%cancelled
1,400scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late4.9%all scheduled flights
120+ minutes late1.6%all scheduled flights
Diverted0.6%did not reach as scheduled
Average arrival-2.9 mincompleted flights

Which departure time was most reliable for IAD to SAN?

Among qualifying IAD-to-SAN departure window results, Late morning had the highest on-time rate: 93.1% of 188 flights. Evening was lowest at 76.8% across 702 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning14690.4%6.8%0.0%
Late morning18893.1%1.6%1.1%
Afternoon36485.7%6.9%0.3%
Evening70276.8%14.2%0.4%

Which weekday was most reliable for IAD to SAN?

Among qualifying IAD-to-SAN weekday results, Saturday had the highest on-time rate: 85.6% of 181 flights. Wednesday was lowest at 79.4% across 194 flights.

DayFlightsOn time30+ minCancelled
Monday20785.5%7.7%0.5%
Tuesday19885.4%8.6%0.0%
Wednesday19479.4%10.3%0.0%
Thursday20682.0%7.3%0.5%
Friday20779.7%11.6%0.0%
Saturday18185.6%9.4%0.0%
Sunday20781.6%14.0%1.9%

Which airline was most reliable for IAD to SAN?

Among qualifying IAD-to-SAN airline results, United Airlines had the highest on-time rate: 86.2% of 1,040 flights. Alaska Airlines was lowest at 72.5% across 360 flights.

AirlineFlightsOn time30+ minCancelled
United Airlines1,04086.2%7.6%0.4%
Alaska Airlines36072.5%16.4%0.6%

Which month was most reliable for IAD to SAN?

Among qualifying IAD-to-SAN month results, August 2025 had the highest on-time rate: 90.3% of 124 flights. July 2025 was lowest at 71.3% across 122 flights.

MonthFlightsOn time30+ minCancelled
July 202512271.3%22.1%0.0%
August 202512490.3%7.3%0.8%
September 202511987.4%5.0%0.0%
October 202511988.2%0.0%0.0%
November 202511580.0%13.0%0.0%
December 202512277.0%12.3%0.0%
January 202611279.5%8.0%3.6%
February 202610086.0%9.0%0.0%
March 202611785.5%12.0%0.9%
April 202611089.1%6.4%0.0%
May 202612084.2%10.0%0.0%
June 202612075.0%12.5%0.0%

What drove IAD to SAN delay minutes?

National airspace was the largest recorded IAD-to-SAN delay category, accounting for 35.8% of 13,235 BTS-attributed delay minutes during July 2025–June 2026.

Airline22.3%
Late aircraft29.3%
National airspace35.8%
Weather12.1%
Security0.5%
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.