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

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

Historically, 77.4% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 2,787 flights.

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

When is this route most reliable?

The same route can behave differently through the day. These are scheduled departure windows, not actual departure times. Small time windows with fewer than 40 flights are withheld.

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%

Weekday comparison

Day-of-week results use at least 30 scheduled flights per row. Look for broad patterns, not tiny percentage differences.

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%

Airline comparison

Marketing-carrier results make codeshare flights easier to compare as travelers buy them. Dedicated route-airline reports require at least 160 flights.

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

Monthly trend

Month-by-month results show whether a twelve-month average hides an unusual period.

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 reported delay minutes?

BTS cause minutes are reported for qualifying delayed flights. These shares describe recorded delay minutes—not the chance that a particular cause will affect your next flight.

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.