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

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

Historically, 64.8% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 6,764 flights.

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

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 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%

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
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%

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
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%

Monthly trend

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

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 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.

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.