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

Washington, DC (IAD) to San Francisco, CA (SFO) flight delay odds

77.4% of 2,787 official scheduled IAD-to-SFO flights arrived on time; 13.9% 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 SIGNALGenerally reliable
77.4%arrived on time
13.9%30+ min late
0.9%cancelled
2,787scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late8.2%all scheduled flights
120+ minutes late4.0%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+6.7 mincompleted flights

Which departure time was most reliable for IAD to SFO?

Among qualifying IAD-to-SFO departure window results, Early morning had the highest on-time rate: 84.4% of 737 flights. Evening was lowest at 61.9% across 656 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning73784.4%7.6%0.8%
Late morning7382.2%9.6%0.0%
Afternoon97380.9%12.9%0.6%
Evening65661.9%25.2%1.7%
Night34881.3%9.2%0.6%

Which weekday was most reliable for IAD to SFO?

Among qualifying IAD-to-SFO weekday results, Tuesday had the highest on-time rate: 84.6% of 383 flights. Monday was lowest at 73.5% across 408 flights.

DayFlightsOn time30+ minCancelled
Monday40873.5%15.7%1.5%
Tuesday38384.6%9.7%0.0%
Wednesday38678.2%15.0%0.5%
Thursday40577.5%14.3%0.2%
Friday40773.7%17.0%0.5%
Saturday39079.5%11.5%0.8%
Sunday40875.5%13.5%2.7%

Which airline was most reliable for IAD to SFO?

Among qualifying IAD-to-SFO airline results, United Airlines had the highest on-time rate: 77.8% of 2,688 flights. Alaska Airlines was lowest at 66.7% across 99 flights.

AirlineFlightsOn time30+ minCancelled
United Airlines2,68877.8%13.5%0.9%
Alaska Airlines9966.7%23.2%1.0%

Which month was most reliable for IAD to SFO?

Among qualifying IAD-to-SFO month results, September 2025 had the highest on-time rate: 87.4% of 206 flights. June 2026 was lowest at 63.2% across 234 flights.

MonthFlightsOn time30+ minCancelled
July 202526767.8%22.5%1.1%
August 202525582.4%12.2%1.2%
September 202520687.4%8.3%0.0%
October 202524682.1%9.3%0.8%
November 202523081.7%10.9%0.9%
December 202524568.6%20.4%0.0%
January 202620974.2%16.7%4.8%
February 202618978.3%14.3%0.0%
March 202620986.1%7.2%1.9%
April 202622980.8%11.4%0.0%
May 202626879.5%12.3%0.0%
June 202623463.2%18.8%0.4%

What drove IAD to SFO delay minutes?

National airspace was the largest recorded IAD-to-SFO delay category, accounting for 37.0% of 44,223 BTS-attributed delay minutes during July 2025–June 2026.

Airline27.6%
Late aircraft30.3%
National airspace37.0%
Weather5.1%
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.