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

Seattle, WA (SEA) to San Diego, CA (SAN) flight delay odds

76.1% of 4,584 official scheduled SEA-to-SAN flights arrived on time; 12.4% 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
76.1%arrived on time
12.4%30+ min late
1.2%cancelled
4,584scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late4.7%all scheduled flights
120+ minutes late1.2%all scheduled flights
Diverted0.4%did not reach as scheduled
Average arrival+3.9 mincompleted flights

Which departure time was most reliable for SEA to SAN?

Among qualifying SEA-to-SAN departure window results, Early morning had the highest on-time rate: 89.0% of 730 flights. Evening was lowest at 68.6% across 1,113 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning73089.0%5.1%1.5%
Late morning1,31176.4%12.1%0.9%
Afternoon1,30374.5%12.7%1.3%
Evening1,11368.6%17.6%1.2%
Night12781.1%10.2%2.4%

Which weekday was most reliable for SEA to SAN?

Among qualifying SEA-to-SAN weekday results, Tuesday had the highest on-time rate: 81.1% of 656 flights. Sunday was lowest at 71.2% across 677 flights.

DayFlightsOn time30+ minCancelled
Monday69577.0%11.8%0.7%
Tuesday65681.1%9.0%0.5%
Wednesday63779.9%10.8%1.4%
Thursday68872.7%13.7%1.7%
Friday66973.2%14.8%1.2%
Saturday56278.5%10.5%2.0%
Sunday67771.2%16.0%1.2%

Which airline was most reliable for SEA to SAN?

Among qualifying SEA-to-SAN airline results, Delta Air Lines had the highest on-time rate: 81.4% of 1,700 flights. Southwest Airlines was lowest at 55.9% across 118 flights.

AirlineFlightsOn time30+ minCancelled
Alaska Airlines2,76573.7%13.1%1.4%
Delta Air Lines1,70081.4%10.8%0.9%
Southwest Airlines11855.9%22.0%0.0%
SkyWest Airlines1100.0%0.0%0.0%

Which month was most reliable for SEA to SAN?

Among qualifying SEA-to-SAN month results, April 2026 had the highest on-time rate: 88.0% of 409 flights. December 2025 was lowest at 66.5% across 358 flights.

MonthFlightsOn time30+ minCancelled
July 202544673.8%11.9%2.7%
August 202542671.1%15.0%1.6%
September 202538779.6%9.8%1.6%
October 202534873.0%12.9%2.3%
November 202531970.5%16.6%0.0%
December 202535866.5%18.2%2.0%
January 202633479.0%11.4%0.3%
February 202630681.4%7.8%0.3%
March 202638874.7%14.2%1.8%
April 202640988.0%5.9%0.0%
May 202642782.4%8.9%0.9%
June 202643672.7%16.7%0.7%

What drove SEA to SAN delay minutes?

Airline was the largest recorded SEA-to-SAN delay category, accounting for 37.3% of 47,376 BTS-attributed delay minutes during July 2025–June 2026.

Airline37.3%
Late aircraft30.3%
National airspace29.9%
Weather2.4%
Security0.1%
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.