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Route · BOS → SAN · 2020–2025 BTS data

Boston to San Diego

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), BOS to SAN (Boston to San Diego) ranks #1712 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

80%
On-time
+1 pts
vs US avg
58 min
Delay when late
7,391
Flights
#1712 of 4927
Corpus placement

Cancelled

0.7%

Best Month

Mar 2025 88%

Worst Month

Feb 2025 63%

Distance

2,588 mi

Carriers

8

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 133 30 2 3 DL,AS,B6
Nov 2025 137 25 1 0 AS,B6,DL
Oct 2025 163 35 2 2 AS,B6,DL
Sep 2025 135 37 1 4 DL,AS,B6
Aug 2025 176 33 0 1 AS,B6,DL
Jul 2025 181 44 2 0 AS,B6,DL
Jun 2025 172 30 0 0 AS,B6,DL
May 2025 164 26 0 0 AS,B6,DL
Apr 2025 117 20 0 0 DL,AS,B6
Mar 2025 121 15 0 1 AS,B6,DL
Feb 2025 104 39 2 1 AS,B6,DL
Jan 2025 117 15 1 1 AS,B6,DL
Dec 2024 122 29 2 2 AS,B6,DL
Nov 2024 112 20 0 0 B6,AS,DL
Oct 2024 141 34 0 3 AS,DL,NK,B6
Sep 2024 116 25 0 1 AS,B6,DL
Aug 2024 142 43 2 0 AS,B6,DL
Jul 2024 155 47 2 1 AS,B6,DL
Jun 2024 149 41 0 0 AS,B6,DL
May 2024 158 40 0 1 AS,B6,DL
Apr 2024 116 38 0 0 AS,B6,DL
Mar 2024 117 17 0 0 AS,B6,DL
Feb 2024 95 13 0 0 AS,B6,DL
Jan 2024 88 11 5 0 AS,B6,DL

BOS–SAN seasonal on-time pattern

Best: May (84.2%) · weakest: December (77.2%)

76%78%80%82%84%86% JanFebMarAprMayJunJulAugSepOctNovDec 77.2%

Strongest calendar month

May

84.2% on-time · ~124 flights/mo

Busiest calendar month

June

~126 flights/mo avg

Weakest calendar month

December

77.2% on-time · ~100 flights/mo

Cancellation Rate

0.7%

22 of 3,231 flights

Diversion Rate

0.6%

21 of 3,231 flights

Explore origin & destination

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

BOS - Boston

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

BOS on-time profile

SAN - San Diego

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

SAN on-time profile

Compare the two airports

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

Compare BOS vs SAN

Origin-hub reliability standing

Mid-pack among BOS departures

From BOS, this corridor sits with 49 other 75–85% on-time routes out of 60 tracked departures, not the hub's reliability leaders (6 at ≥85%) and not the softest ( 5 below 75%). Destination: San Diego · fleet on-time rank #3127 of 4927.

What the Data Says About BOS to SAN

7,391 tracked flights put the BOS to SAN pairing (Boston to San Diego) at a 80% on-time rate, squarely in line with the wider network. Delays that do occur run 58.2 minutes on average. Across the 2,588-mile route and its 8 carriers, the trailing 24 months show 0.7% cancelled and 0.6% diverted (3,231 flights sampled).

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

On the multi-year calendar, BOS–SAN peaks in May at 84.2% on-time while June carries the heaviest traffic (~126 flights per month) ; the softest month is December at 77.2%, a 7.0-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does BOS to SAN rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, BOS to SAN ranks #1712 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 BOS to SAN? ▼
Flights from Boston to San Diego have a 80% on-time rate based on 7,391 flights. The average delay is 58.2 minutes. The best recent month was Mar 2025 with 88% on-time.
What is the cancellation rate for BOS to SAN? ▼
Over the last 24 months, 0.7% of flights on this route were cancelled (22 of 3,231 flights) and 0.6% were diverted.
How far is the flight from BOS to SAN? ▼
The flight distance from Boston (BOS) to San Diego (SAN) is approximately 2,588 miles. This route is served by 8 carriers.
When is the best time to fly from BOS to SAN? ▼
The best recent month for on-time performance was Mar 2025 (88% on-time). The worst was Feb 2025 (63% on-time). Consider booking during months with historically better performance.

Airports on this route

BOS Airport

Boston
SAN Airport

San Diego
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 BOS–SAN data

BOS–SAN is mid-pack at 80% on-time; month and carrier mix move more than the corridor headline.

  • Compare BOS and SAN airport profiles: delay causes and top routes differ even on the same corridor. BOS airport
  • If your dates flex, May (84.2% on-time) beats December (77.2%) on this corridor. Seasonal chart
  • 4 other routes post a similar 80% 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.