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

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

79.4% of 4,582 official scheduled SAN-to-SEA flights arrived on time; 11.2% arrived at least 30 minutes late and 1.7% 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
79.4%arrived on time
11.2%30+ min late
1.7%cancelled
4,582scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late5.5%all scheduled flights
120+ minutes late2.1%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+2.0 mincompleted flights

Which departure time was most reliable for SAN to SEA?

Among qualifying SAN-to-SEA departure window results, Early morning had the highest on-time rate: 85.0% of 994 flights. Evening was lowest at 74.2% across 1,100 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning99485.0%6.8%2.0%
Late morning90182.6%9.1%1.7%
Afternoon1,57078.0%13.4%1.0%
Evening1,10074.2%13.7%2.3%

Which weekday was most reliable for SAN to SEA?

Among qualifying SAN-to-SEA weekday results, Tuesday had the highest on-time rate: 86.4% of 655 flights. Friday was lowest at 72.1% across 671 flights.

DayFlightsOn time30+ minCancelled
Monday69579.3%11.4%0.7%
Tuesday65586.4%7.5%0.9%
Wednesday63683.6%7.9%1.4%
Thursday68776.4%12.7%1.7%
Friday67172.1%16.5%2.1%
Saturday56182.9%8.4%2.7%
Sunday67776.4%13.6%2.2%

Which airline was most reliable for SAN to SEA?

Among qualifying SAN-to-SEA airline results, Delta Air Lines had the highest on-time rate: 86.3% of 1,700 flights. Southwest Airlines was lowest at 57.6% across 118 flights.

AirlineFlightsOn time30+ minCancelled
Alaska Airlines2,76376.2%12.6%2.1%
Delta Air Lines1,70086.3%8.3%1.1%
Southwest Airlines11857.6%21.2%0.0%
SkyWest Airlines10.0%0.0%0.0%

Which month was most reliable for SAN to SEA?

Among qualifying SAN-to-SEA month results, February 2026 had the highest on-time rate: 91.5% of 305 flights. August 2025 was lowest at 67.8% across 426 flights.

MonthFlightsOn time30+ minCancelled
July 202544673.3%14.8%2.5%
August 202542667.8%17.4%2.1%
September 202538884.0%7.5%1.3%
October 202534880.5%10.6%2.3%
November 202532077.5%13.8%1.6%
December 202535574.9%13.8%2.8%
January 202633485.9%9.6%0.9%
February 202630591.5%4.9%0.7%
March 202638877.3%12.9%2.3%
April 202640888.2%6.1%0.2%
May 202642882.2%9.1%1.9%
June 202643674.8%12.6%1.1%

What drove SAN to SEA delay minutes?

Late aircraft was the largest recorded SAN-to-SEA delay category, accounting for 51.8% of 55,056 BTS-attributed delay minutes during July 2025–June 2026.

Airline30.9%
Late aircraft51.8%
National airspace16.4%
Weather0.4%
Security0.5%
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.