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

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

76.3% of 1,818 official scheduled SAN-to-BOS flights arrived on time; 15.2% arrived at least 30 minutes late and 1.5% 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
76.3%arrived on time
15.2%30+ min late
1.5%cancelled
1,818scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late8.2%all scheduled flights
120+ minutes late3.2%all scheduled flights
Diverted0.6%did not reach as scheduled
Average arrival+6.8 mincompleted flights

Which departure time was most reliable for SAN to BOS?

Among qualifying SAN-to-BOS departure window results, Night had the highest on-time rate: 80.7% of 576 flights. Late morning was lowest at 72.1% across 355 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning25672.7%19.5%1.2%
Late morning35572.1%16.9%1.4%
Afternoon32972.3%19.5%2.1%
Evening30280.1%15.9%0.7%
Night57680.7%9.4%1.9%

Which weekday was most reliable for SAN to BOS?

Among qualifying SAN-to-BOS weekday results, Saturday had the highest on-time rate: 85.2% of 210 flights. Sunday was lowest at 68.2% across 274 flights.

DayFlightsOn time30+ minCancelled
Monday27478.5%14.6%2.6%
Tuesday26479.2%13.6%0.0%
Wednesday25578.4%13.3%1.2%
Thursday26971.7%18.6%2.2%
Friday27275.0%17.3%0.7%
Saturday21085.2%7.6%0.0%
Sunday27468.2%19.3%3.6%

Which airline was most reliable for SAN to BOS?

Among qualifying SAN-to-BOS airline results, JetBlue Airways had the highest on-time rate: 78.0% of 919 flights. Alaska Airlines was lowest at 73.8% across 508 flights.

AirlineFlightsOn time30+ minCancelled
JetBlue Airways91978.0%15.6%1.4%
Alaska Airlines50873.8%15.7%1.8%
Delta Air Lines36477.7%11.3%1.6%
Southwest Airlines2744.4%44.4%0.0%

Which month was most reliable for SAN to BOS?

Among qualifying SAN-to-BOS month results, May 2026 had the highest on-time rate: 89.6% of 164 flights. July 2025 was lowest at 69.1% across 181 flights.

MonthFlightsOn time30+ minCancelled
July 202518169.1%19.9%1.7%
August 202517584.0%8.6%0.6%
September 202513571.1%20.7%1.5%
October 202516374.8%20.2%1.2%
November 202513777.4%16.8%0.7%
December 202513473.1%12.7%2.2%
January 202611978.2%14.3%5.0%
February 202611269.6%12.5%7.1%
March 202615170.9%21.2%0.0%
April 202614476.4%12.5%0.7%
May 202616489.6%7.3%0.0%
June 202620377.8%15.3%0.5%

What drove SAN to BOS delay minutes?

National airspace was the largest recorded SAN-to-BOS delay category, accounting for 32.1% of 33,575 BTS-attributed delay minutes during July 2025–June 2026.

Airline27.5%
Late aircraft31.6%
National airspace32.1%
Weather8.7%
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.