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Route · MIA → SJU · 2020–2025 BTS data

Miami to San Juan

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), MIA to SJU (Miami to San Juan) ranks #616 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

78.3%
On-time
-0.7 pts
vs US avg
73 min
Delay when late
14,957
Flights
#616 of 4927
Corpus placement

Cancelled

0.8%

Best Month

Oct 2024 90%

Worst Month

Jul 2025 63%

Distance

1,045 mi

Carriers

8

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 257 50 2 0 F9,NK,AA
Nov 2025 212 50 1 0 F9,NK,AA
Oct 2025 176 47 0 0 AA,F9
Sep 2025 168 36 0 0 NK,F9,AA
Aug 2025 210 65 1 0 AA,F9,NK
Jul 2025 215 80 1 0 AA,NK,F9
Jun 2025 207 48 5 0 AA,F9,NK
May 2025 209 37 0 1 AA,F9,NK
Apr 2025 221 44 0 0 F9,NK,AA
Mar 2025 246 59 3 0 AA,F9,NK
Feb 2025 227 34 1 0 AA,F9,NK
Jan 2025 242 66 0 1 AA,F9,NK
Dec 2024 246 72 0 0 AA,F9,NK
Nov 2024 234 45 0 1 NK,F9,AA
Oct 2024 219 21 4 0 NK,F9,AA
Sep 2024 221 28 0 0 AA,F9,MQ,NK
Aug 2024 278 92 4 0 AA,F9,MQ,NK
Jul 2024 285 69 3 1 AA,F9,NK
Jun 2024 260 85 12 0 AA,F9,NK
May 2024 280 69 1 1 AA,F9,NK
Apr 2024 267 55 0 1 AA,F9,NK
Mar 2024 244 75 3 1 AA,F9,NK
Feb 2024 208 41 1 1 AA,F9,NK
Jan 2024 221 66 0 0 AA,F9,NK

MIA–SJU seasonal on-time pattern

Best: October (85.6%) · weakest: June (73.1%)

70%75%80%85%90% JanFebMarAprMayJunJulAugSepOctNovDec 75.1%

Strongest calendar month

October

85.6% on-time · ~190 flights/mo

Busiest calendar month

July

~228 flights/mo avg

Weakest calendar month

June

73.1% on-time · ~207 flights/mo

Cancellation Rate

0.8%

42 of 5,553 flights

Diversion Rate

0.1%

8 of 5,553 flights

Explore origin & destination

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

MIA - Miami

Full on-time, delay-cause, and seasonal performance for Miami, FL.

MIA on-time profile

SJU - San Juan

Full on-time, delay-cause, and seasonal performance for San Juan, PR.

SJU on-time profile

Compare the two airports

See MIA and SJU side by side on delays, cancellations, and reliability.

Compare MIA vs SJU

Origin-hub reliability standing

Mid-pack among MIA departures

From MIA, this corridor sits with 37 other 75–85% on-time routes out of 63 tracked departures, not the hub's reliability leaders (1 at ≥85%) and not the softest ( 25 below 75%). Destination: San Juan · fleet on-time rank #3755 of 4927.

What the Data Says About MIA to SJU

The Miami to San Juan corridor (MIA to SJU) posts a 78.3% on-time rate on the lower edge of the average band, based on 14,957 tracked flights. Late flights run 73.1 minutes behind on average. 8 carriers cover the 1,045-mile route; over the last 24 months, 42 of 5,553 flights were cancelled (0.8%) and 0.1% diverted.

The monthly split is wide on this route: Oct 2024 posted the strongest performance at 90% on-time, while Jul 2025 came in at just 63% - a 28-point swing worth factoring into travel timing.

On the multi-year calendar, MIA–SJU peaks in October at 85.6% on-time while July carries the heaviest traffic (~228 flights per month) ; the softest month is June at 73.1%, a 12.5-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does MIA to SJU rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, MIA to SJU ranks #616 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 MIA to SJU? ▼
Flights from Miami to San Juan have a 78.3% on-time rate based on 14,957 flights. The average delay is 73.1 minutes. The best recent month was Oct 2024 with 90% on-time.
What is the cancellation rate for MIA to SJU? ▼
Over the last 24 months, 0.8% of flights on this route were cancelled (42 of 5,553 flights) and 0.1% were diverted.
How far is the flight from MIA to SJU? ▼
The flight distance from Miami (MIA) to San Juan (SJU) is approximately 1,045 miles. This route is served by 8 carriers.
When is the best time to fly from MIA to SJU? ▼
The best recent month for on-time performance was Oct 2024 (90% on-time). The worst was Jul 2025 (63% on-time). Consider booking during months with historically better performance.

Airports on this route

MIA Airport

Miami
SJU Airport

San Juan
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 MIA–SJU data

MIA–SJU is mid-pack at 78.3% on-time; month and carrier mix move more than the corridor headline.

  • Compare MIA and SJU airport profiles: delay causes and top routes differ even on the same corridor. MIA airport
  • If your dates flex, October (85.6% on-time) beats June (73.1%) on this corridor. Seasonal chart
  • 4 other routes post a similar 78.3% 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.