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

Seattle, WA (SEA) to San Francisco, CA (SFO) flight delay odds

64.8% of 6,764 official scheduled SEA-to-SFO flights arrived on time; 22.6% arrived at least 30 minutes late and 1.2% 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 SIGNALVariable
64.8%arrived on time
22.6%30+ min late
1.2%cancelled
6,764scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late10.5%all scheduled flights
120+ minutes late3.2%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+14.9 mincompleted flights

Which departure time was most reliable for SEA to SFO?

Among qualifying SEA-to-SFO departure window results, Afternoon had the highest on-time rate: 72.5% of 1,742 flights. Evening was lowest at 59.1% across 1,977 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning1,60662.1%24.0%2.1%
Late morning1,00765.0%21.1%0.8%
Afternoon1,74272.5%16.2%1.3%
Evening1,97759.1%28.4%0.7%
Night43268.8%19.9%0.9%

Which weekday was most reliable for SEA to SFO?

Among qualifying SEA-to-SFO weekday results, Tuesday had the highest on-time rate: 72.1% of 937 flights. Monday was lowest at 60.3% across 1,038 flights.

DayFlightsOn time30+ minCancelled
Monday1,03860.3%27.1%1.3%
Tuesday93772.1%15.4%0.4%
Wednesday94168.3%21.4%0.9%
Thursday1,01062.1%24.8%1.4%
Friday1,01060.7%25.5%1.8%
Saturday84771.2%16.2%1.3%
Sunday98160.4%26.1%1.2%

Which airline was most reliable for SEA to SFO?

Among qualifying SEA-to-SFO airline results, SkyWest Airlines had the highest on-time rate: 74.7% of 1,081 flights. Alaska Airlines was lowest at 59.5% across 2,716 flights.

AirlineFlightsOn time30+ minCancelled
Alaska Airlines2,71659.5%26.3%1.4%
United Airlines2,04065.9%23.4%0.8%
SkyWest Airlines1,08174.7%14.3%1.0%
Delta Air Lines92366.2%19.4%1.6%
Southwest Airlines4100.0%0.0%0.0%

Which month was most reliable for SEA to SFO?

Among qualifying SEA-to-SFO month results, March 2026 had the highest on-time rate: 79.7% of 528 flights. June 2026 was lowest at 38.9% across 633 flights.

MonthFlightsOn time30+ minCancelled
July 202563969.3%20.2%1.9%
August 202561973.2%17.6%0.6%
September 202558474.7%14.7%0.7%
October 202558472.1%16.3%1.2%
November 202556770.4%16.0%2.3%
December 202555865.6%25.6%0.7%
January 202648675.3%16.7%1.2%
February 202648073.5%14.4%1.0%
March 202652879.7%11.7%2.5%
April 202649548.5%31.3%0.0%
May 202659140.1%41.1%1.4%
June 202663338.9%41.7%0.8%

What drove SEA to SFO delay minutes?

National airspace was the largest recorded SEA-to-SFO delay category, accounting for 52.4% of 134,325 BTS-attributed delay minutes during July 2025–June 2026.

Airline23.1%
Late aircraft20.2%
National airspace52.4%
Weather4.3%
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.