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Route · ATL → SJU · 2020–2025 BTS data

Atlanta to San Juan

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), ATL to SJU (Atlanta to San Juan) ranks #1211 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

78%
On-time
-1 pts
vs US avg
66 min
Delay when late
9,654
Flights
#1211 of 4927
Corpus placement

Cancelled

0.7%

Best Month

Sep 2024 88%

Worst Month

Jul 2024 65%

Distance

1,547 mi

Carriers

9

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 194 61 5 1 DL,F9,NK
Nov 2025 149 34 3 1 DL,F9
Oct 2025 133 30 0 1 DL,F9
Sep 2025 128 31 0 0 DL,NK,F9
Aug 2025 155 46 1 0 F9,NK,DL
Jul 2025 208 65 0 1 NK,DL,F9
Jun 2025 202 66 2 0 DL,F9,NK
May 2025 201 66 1 0 DL,F9,NK
Apr 2025 200 48 0 0 DL,F9,NK
Mar 2025 220 58 1 0 DL,F9,NK
Feb 2025 158 39 0 0 DL,F9
Jan 2025 189 57 7 2 DL,F9,NK
Dec 2024 206 51 1 1 DL,F9,NK
Nov 2024 136 35 0 0 NK,DL
Oct 2024 128 16 0 0 DL,NK
Sep 2024 115 14 0 0 NK,DL
Aug 2024 161 25 2 0 DL,F9,NK
Jul 2024 204 72 4 1 DL,F9,NK
Jun 2024 197 48 0 2 DL,F9,NK
May 2024 200 49 1 1 DL,F9,NK
Apr 2024 175 33 0 0 DL,F9,NK
Mar 2024 207 45 0 0 DL,F9,NK
Feb 2024 179 29 0 0 DL,F9,NK
Jan 2024 209 38 1 0 DL,F9,NK

ATL–SJU seasonal on-time pattern

Best: October (84.7%) · weakest: June (68.1%)

65%70%75%80%85%90% JanFebMarAprMayJunJulAugSepOctNovDec 79.1%

Strongest calendar month

October

84.7% on-time · ~110 flights/mo

Busiest calendar month

May

~166 flights/mo avg

Weakest calendar month

June

68.1% on-time · ~162 flights/mo

Cancellation Rate

0.7%

29 of 4,254 flights

Diversion Rate

0.3%

11 of 4,254 flights

Explore origin & destination

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

ATL - Atlanta

Full on-time, delay-cause, and seasonal performance for Atlanta, GA.

ATL 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 ATL and SJU side by side on delays, cancellations, and reliability.

Compare ATL vs SJU

Origin-hub reliability standing

Mid-pack among ATL departures

From ATL, this corridor sits with 75 other 75–85% on-time routes out of 144 tracked departures, not the hub's reliability leaders (67 at ≥85%) and not the softest ( 2 below 75%). Destination: San Juan · fleet on-time rank #3828 of 4927.

What the Data Says About ATL to SJU

The Atlanta to San Juan corridor (ATL to SJU) posts a 78% on-time rate on the lower edge of the average band, based on 9,654 tracked flights. Late flights run 66.4 minutes behind on average. 9 carriers cover the 1,547-mile route; over the last 24 months, 29 of 4,254 flights were cancelled (0.7%) and 0.3% diverted.

The monthly split is wide on this route: Sep 2024 posted the strongest performance at 88% on-time, while Jul 2024 came in at just 65% - a 23-point swing worth factoring into travel timing.

On the multi-year calendar, ATL–SJU peaks in October at 84.7% on-time while May carries the heaviest traffic (~166 flights per month) ; the softest month is June at 68.1%, a 16.6-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does ATL to SJU rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, ATL to SJU ranks #1211 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 ATL to SJU? ▼
Flights from Atlanta to San Juan have a 78% on-time rate based on 9,654 flights. The average delay is 66.4 minutes. The best recent month was Sep 2024 with 88% on-time.
What is the cancellation rate for ATL to SJU? ▼
Over the last 24 months, 0.7% of flights on this route were cancelled (29 of 4,254 flights) and 0.3% were diverted.
How far is the flight from ATL to SJU? ▼
The flight distance from Atlanta (ATL) to San Juan (SJU) is approximately 1,547 miles. This route is served by 9 carriers.
When is the best time to fly from ATL to SJU? ▼
The best recent month for on-time performance was Sep 2024 (88% on-time). The worst was Jul 2024 (65% on-time). Consider booking during months with historically better performance.

Airports on this route

ATL Airport

Atlanta
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 ATL–SJU data

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

  • Compare ATL and SJU airport profiles: delay causes and top routes differ even on the same corridor. ATL airport
  • If your dates flex, October (84.7% on-time) beats June (68.1%) 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.