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

Boston, MA (BOS) to San Diego, CA (SAN) flight delay odds

74.9% of 1,818 official scheduled BOS-to-SAN flights arrived on time; 13.6% arrived at least 30 minutes late and 1.4% 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
74.9%arrived on time
13.6%30+ min late
1.4%cancelled
1,818scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late7.0%all scheduled flights
120+ minutes late2.1%all scheduled flights
Diverted0.7%did not reach as scheduled
Average arrival+1.8 mincompleted flights

Which departure time was most reliable for BOS to SAN?

Among qualifying BOS-to-SAN departure window results, Late morning had the highest on-time rate: 85.8% of 267 flights. Evening was lowest at 63.4% across 565 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning47284.1%6.8%1.5%
Late morning26785.8%9.0%1.1%
Afternoon51473.3%16.0%1.4%
Evening56563.4%19.5%1.4%

Which weekday was most reliable for BOS to SAN?

Among qualifying BOS-to-SAN weekday results, Thursday had the highest on-time rate: 76.5% of 268 flights. Friday was lowest at 71.8% across 273 flights.

DayFlightsOn time30+ minCancelled
Monday27475.5%12.8%3.6%
Tuesday26575.5%12.1%1.9%
Wednesday25575.7%12.9%0.4%
Thursday26876.5%11.9%0.7%
Friday27371.8%15.8%1.1%
Saturday20975.6%13.9%0.0%
Sunday27473.7%16.1%1.5%

Which airline was most reliable for BOS to SAN?

Among qualifying BOS-to-SAN airline results, JetBlue Airways had the highest on-time rate: 83.6% of 919 flights. Delta Air Lines was lowest at 65.7% across 364 flights.

AirlineFlightsOn time30+ minCancelled
JetBlue Airways91983.6%10.1%1.2%
Alaska Airlines50868.1%16.9%1.6%
Delta Air Lines36465.7%15.9%1.6%
Southwest Airlines2729.6%40.7%0.0%

Which month was most reliable for BOS to SAN?

Among qualifying BOS-to-SAN month results, March 2026 had the highest on-time rate: 81.5% of 151 flights. June 2026 was lowest at 66.0% across 203 flights.

MonthFlightsOn time30+ minCancelled
July 202518174.6%15.5%1.1%
August 202517680.7%7.4%0.0%
September 202513568.9%17.0%0.7%
October 202516376.1%16.0%1.2%
November 202513781.0%13.1%0.7%
December 202513373.7%15.0%1.5%
January 202612066.7%15.8%6.7%
February 202611268.8%14.3%7.1%
March 202615181.5%10.6%0.0%
April 202614477.8%11.8%0.0%
May 202616381.0%11.7%0.0%
June 202620366.0%16.3%0.5%

What drove BOS to SAN delay minutes?

Late aircraft was the largest recorded BOS-to-SAN delay category, accounting for 36.4% of 23,351 BTS-attributed delay minutes during July 2025–June 2026.

Airline27.9%
Late aircraft36.4%
National airspace33.0%
Weather2.6%
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.