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Route · SAN → BOS · 2020–2025 BTS data

San Diego to Boston

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SAN to BOS (San Diego to Boston) ranks #1713 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

78%
On-time
-1 pts
vs US avg
75 min
Delay when late
7,391
Flights
#1713 of 4927
Corpus placement

Cancelled

0.7%

Best Month

Apr 2025 88%

Worst Month

Jul 2024 63%

Distance

2,588 mi

Carriers

8

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 134 31 3 2 DL,AS,B6
Nov 2025 137 29 1 1 AS,B6,DL
Oct 2025 163 39 2 0 AS,B6,DL
Sep 2025 135 36 2 1 DL,AS,B6
Aug 2025 175 27 1 0 AS,B6,DL
Jul 2025 181 52 3 1 AS,B6,DL
Jun 2025 172 38 0 1 AS,B6,DL
May 2025 165 37 0 0 AS,B6,DL
Apr 2025 117 14 0 0 DL,AS,B6
Mar 2025 121 33 2 1 AS,B6,DL
Feb 2025 104 28 2 2 AS,B6,DL
Jan 2025 117 15 1 0 AS,B6,DL
Dec 2024 122 44 3 0 AS,B6,DL
Nov 2024 112 15 0 0 B6,AS,DL
Oct 2024 140 37 0 0 AS,DL,B6
Sep 2024 116 31 0 0 AS,B6,DL
Aug 2024 142 50 0 0 AS,B6,DL
Jul 2024 155 57 2 0 AS,B6,DL
Jun 2024 149 42 0 0 AS,B6,DL
May 2024 158 27 0 1 AS,B6,DL
Apr 2024 116 19 0 0 AS,B6,DL
Mar 2024 117 19 0 0 AS,B6,DL
Feb 2024 95 16 0 0 AS,B6,DL
Jan 2024 88 20 1 0 AS,B6,DL

SAN–BOS seasonal on-time pattern

Best: April (83.3%) · weakest: December (73.1%)

70%75%80%85% JanFebMarAprMayJunJulAugSepOctNovDec 73.1%

Strongest calendar month

April

83.3% on-time · ~89 flights/mo

Busiest calendar month

June

~126 flights/mo avg

Weakest calendar month

December

73.1% on-time · ~101 flights/mo

Cancellation Rate

0.7%

23 of 3,231 flights

Diversion Rate

0.3%

10 of 3,231 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

SAN - San Diego

Full on-time, delay-cause, and seasonal performance for San Diego, CA.

SAN on-time profile

BOS - Boston

Full on-time, delay-cause, and seasonal performance for Boston, MA.

BOS on-time profile

Compare the two airports

See SAN and BOS side by side on delays, cancellations, and reliability.

Compare SAN vs BOS

Origin-hub reliability standing

Mid-pack among SAN departures

From SAN, this corridor sits with 34 other 75–85% on-time routes out of 51 tracked departures, not the hub's reliability leaders (13 at ≥85%) and not the softest ( 4 below 75%). Destination: Boston · fleet on-time rank #3851 of 4927.

What the Data Says About SAN to BOS

The San Diego to Boston corridor (SAN to BOS) posts a 78% on-time rate on the lower edge of the average band, based on 7,391 tracked flights. Late flights run 75.4 minutes behind on average. 8 carriers cover the 2,588-mile route; over the last 24 months, 23 of 3,231 flights were cancelled (0.7%) and 0.3% diverted.

The monthly split is wide on this route: Apr 2025 posted the strongest performance at 88% on-time, while Jul 2024 came in at just 63% - a 25-point swing worth factoring into travel timing.

On the multi-year calendar, SAN–BOS peaks in April at 83.3% on-time while June carries the heaviest traffic (~126 flights per month) ; the softest month is December at 73.1%, a 10.2-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does SAN to BOS rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, SAN to BOS ranks #1713 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from SAN to BOS? ▼
Flights from San Diego to Boston have a 78% on-time rate based on 7,391 flights. The average delay is 75.4 minutes. The best recent month was Apr 2025 with 88% on-time.
What is the cancellation rate for SAN to BOS? ▼
Over the last 24 months, 0.7% of flights on this route were cancelled (23 of 3,231 flights) and 0.3% were diverted.
How far is the flight from SAN to BOS? ▼
The flight distance from San Diego (SAN) to Boston (BOS) is approximately 2,588 miles. This route is served by 8 carriers.
When is the best time to fly from SAN to BOS? ▼
The best recent month for on-time performance was Apr 2025 (88% on-time). The worst was Jul 2024 (63% on-time). Consider booking during months with historically better performance.

Airports on this route

SAN Airport

San Diego
BOS Airport

Boston
Data source

Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.

Read our methodology - how this data is sourced, computed, and verified.

Using SAN–BOS data

SAN–BOS is mid-pack at 78% on-time; month and carrier mix move more than the corridor headline.

  • Compare SAN and BOS airport profiles: delay causes and top routes differ even on the same corridor. SAN airport
  • If your dates flex, April (83.3% on-time) beats December (73.1%) on this corridor. Seasonal chart
  • 4 other routes post a similar 78% on-time rate; compare before you commit to this pairing. Similar routes

On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.