SAN to BOS flight delays
San Diego, CA (SAN) Boston, MA (BOS) · 2,588 miles
1,818 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
77.92%
Arrived on time
Within 15 minutes of schedule
1.54%
Cancelled
Share of scheduled flights
85 min
When late, late by
Average across delayed arrivals
20 min
Delay per flight
Averaged over every flight flown
What the record says about this route
The season swings this route hard. In May it ran 19.6 points more punctual than in July — a difference bigger than the one between the best and worst airlines on most routes. If the date is flexible, it is worth more than the carrier.
The 3 airlines here are separated by under 4 points — close enough to call a tie. Choose on price and departure time.
The San Diego to Boston route sits close to the middle of the record — neither notably punctual nor notably late.
Which airline should you fly on this route?
Over January 2025 – August 2026, JetBlue Airways arrived on time most often on SAN to BOS. Alaska Airlines was late most often. Flights ran closest to schedule in May and worst in July.
Every airline on SAN to BOS
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| JetBlue Airways | 919 | 79.31% | 1.41% | 99 min | C |
| Alaska Airlines | 508 | 76.22% | 1.77% | 66 min | C |
| Delta Air Lines | 364 | 79.27% | 1.65% | 86 min | C |
| Southwest Airlines | 27 | 44.44% | 0% | 69 min | — |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
BOS to SAN Boston back to San Diego 76.46% on time COther routes from San Diego
Common questions
Are flights from San Diego to Boston usually delayed?
77.92% of flights on the SAN to BOS route arrived within 15 minutes of schedule, so roughly 2 in every ten arrived late. That is about the same as the average route in this record.
Which airline is most on time from San Diego to Boston?
JetBlue Airways, at 79.31% on time across 919 flights. The least punctual on the route was Alaska Airlines at 76.22%.
How often are SAN to BOS flights cancelled?
1.54% of scheduled flights did not operate — about 15 in every thousand. That is in the normal range.
What is the best month to fly San Diego to Boston?
May, when 90.2% of flights arrived on time. The worst was July at 70.6%.
When SAN to BOS flights are late, how late are they?
About 85 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on SAN to BOS during January 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →