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

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

72.7% of 6,770 official scheduled SFO-to-SEA flights arrived on time; 15.8% 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 SIGNALGenerally reliable
72.7%arrived on time
15.8%30+ min late
1.2%cancelled
6,770scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late7.2%all scheduled flights
120+ minutes late2.4%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+7.3 mincompleted flights

Which departure time was most reliable for SFO to SEA?

Among qualifying SFO-to-SEA departure window results, Early morning had the highest on-time rate: 80.7% of 1,172 flights. Night was lowest at 65.9% across 499 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning1,17280.7%8.6%1.2%
Late morning1,29372.7%16.6%2.3%
Afternoon2,15472.9%15.7%0.9%
Evening1,65268.9%18.5%0.7%
Night49965.9%22.2%0.8%

Which weekday was most reliable for SFO to SEA?

Among qualifying SFO-to-SEA weekday results, Saturday had the highest on-time rate: 79.1% of 841 flights. Friday was lowest at 67.9% across 1,003 flights.

DayFlightsOn time30+ minCancelled
Monday1,04071.0%17.2%1.2%
Tuesday94478.2%11.5%0.4%
Wednesday94475.0%14.7%0.8%
Thursday1,00768.2%19.0%1.2%
Friday1,00367.9%18.6%2.1%
Saturday84179.1%10.3%1.5%
Sunday99171.4%18.0%0.9%

Which airline was most reliable for SFO to SEA?

Among qualifying SFO-to-SEA airline results, Delta Air Lines had the highest on-time rate: 82.0% of 924 flights. Alaska Airlines was lowest at 67.9% across 2,719 flights.

AirlineFlightsOn time30+ minCancelled
Alaska Airlines2,71967.9%18.3%1.6%
United Airlines2,04275.5%14.3%0.4%
SkyWest Airlines1,08271.8%16.5%1.1%
Delta Air Lines92482.0%11.1%1.7%
Southwest Airlines3100.0%0.0%0.0%

Which month was most reliable for SFO to SEA?

Among qualifying SFO-to-SEA month results, February 2026 had the highest on-time rate: 85.7% of 481 flights. June 2026 was lowest at 59.7% across 633 flights.

MonthFlightsOn time30+ minCancelled
July 202563965.6%17.4%2.0%
August 202562071.0%17.3%0.6%
September 202558577.4%12.1%0.5%
October 202558572.5%14.7%1.0%
November 202556577.7%11.0%2.1%
December 202555972.8%16.6%0.7%
January 202648582.1%12.6%1.9%
February 202648185.7%8.9%0.8%
March 202652884.1%7.8%3.0%
April 202649669.6%17.3%0.0%
May 202659461.6%24.7%0.8%
June 202663359.7%25.6%0.6%

What drove SFO to SEA delay minutes?

Late aircraft was the largest recorded SFO-to-SEA delay category, accounting for 46.9% of 97,823 BTS-attributed delay minutes during July 2025–June 2026.

Airline26.8%
Late aircraft46.9%
National airspace23.0%
Weather3.2%
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.