PlainFlights

Route · RDU → SJU · 2020–2025 BTS data

Raleigh/Durham to San Juan

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), RDU to SJU (Raleigh/Durham to San Juan) ranks #3962 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

70.4%
On-time
-8.6 pts
vs US avg
87 min
Delay when late
1,762
Flights
#3962 of 4927
Corpus placement

Cancelled

1.3%

Best Month

Jan 2024 80%

Worst Month

Jul 2024 58%

Distance

1,433 mi

Carriers

5

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 51 17 0 0 DL,F9,B6
Nov 2025 41 14 1 0 F9,B6
Aug 2025 42 15 1 0 F9,B6
Jul 2025 48 12 0 0 B6,F9
Jun 2025 41 15 1 0 B6,F9
May 2025 38 8 0 0 B6,F9
Apr 2025 42 6 1 0 F9,B6
Mar 2025 43 9 1 0 B6,F9
Feb 2025 33 10 0 0 B6,F9
Jan 2025 43 12 1 1 B6,F9
Dec 2024 61 21 1 0 B6,F9
Nov 2024 33 9 0 0 B6,F9
Sep 2024 31 9 0 0 B6,F9
Aug 2024 43 13 1 0 B6,F9
Jul 2024 62 26 2 0 B6,F9
Jun 2024 60 21 1 0 B6,F9
May 2024 62 19 0 1 B6,F9
Apr 2024 51 15 1 0 B6,F9
Mar 2024 31 16 2 0 B6
Feb 2024 42 9 0 0 B6,F9
Jan 2024 70 14 0 1 B6,F9
Dec 2023 62 18 0 0 B6,F9
Nov 2023 51 13 0 0 B6,F9
Oct 2023 45 12 1 0 B6,F9

RDU–SJU seasonal on-time pattern

Best: October (79.5%) · weakest: June (56.7%)

50%60%70%80%90% JanFebMarAprMayJunJulAugSepOctNovDec 71.8%

Strongest calendar month

October

79.5% on-time · ~44 flights/mo

Busiest calendar month

January

~57 flights/mo avg

Weakest calendar month

June

56.7% on-time · ~43 flights/mo

Cancellation Rate

1.3%

15 of 1,126 flights

Diversion Rate

0.3%

3 of 1,126 flights

Explore origin & destination

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

RDU - Raleigh/Durham

Full on-time, delay-cause, and seasonal performance for Raleigh/Durham, NC.

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

Compare RDU vs SJU

Origin-hub reliability standing

Softer reliability from RDU

Among 35 routes leaving RDU, only 1 (including this one) clear below 75% on-time, while 9 stay ≥85% and 25 sit mid-band. Travelers comparing RDU options should weigh this 70.4% print against those peers · fleet on-time rank #4832 of 4927.

What the Data Says About RDU to SJU

On-time performance on the RDU to SJU pairing (Raleigh/Durham to San Juan) trails a chunk of the network: 70.4% of 1,762 tracked flights arrived on schedule, with a 86.8-minute average delay on the ones that ran late. The route spans about 1,433 miles across 5 carriers. Cancellations over the trailing 24 months hit 1.3% (15 of 1,126 flights), with 0.3% diverted.

The monthly split is wide on this route: Jan 2024 posted the strongest performance at 80% on-time, while Jul 2024 came in at just 58% - a 22-point swing worth factoring into travel timing.

On the multi-year calendar, RDU–SJU peaks in October at 79.5% on-time while January carries the heaviest traffic (~57 flights per month) ; the softest month is June at 56.7%, a 22.8-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does RDU to SJU rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, RDU to SJU ranks #3962 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 RDU to SJU? ▼
Flights from Raleigh/Durham to San Juan have a 70.4% on-time rate based on 1,762 flights. The average delay is 86.8 minutes. The best recent month was Jan 2024 with 80% on-time.
What is the cancellation rate for RDU to SJU? ▼
Over the last 24 months, 1.3% of flights on this route were cancelled (15 of 1,126 flights) and 0.3% were diverted.
How far is the flight from RDU to SJU? ▼
The flight distance from Raleigh/Durham (RDU) to San Juan (SJU) is approximately 1,433 miles. This route is served by 5 carriers.
When is the best time to fly from RDU to SJU? ▼
The best recent month for on-time performance was Jan 2024 (80% on-time). The worst was Jul 2024 (58% on-time). Consider booking during months with historically better performance.

Airports on this route

RDU Airport

Raleigh/Durham
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 RDU–SJU data

RDU–SJU sits 8.6 pts below the national 79% average; check the seasonal chart and airport profiles before treating the headline as typical.

  • Compare RDU and SJU airport profiles: delay causes and top routes differ even on the same corridor. RDU airport
  • If your dates flex, October (79.5% on-time) beats June (56.7%) on this corridor. Seasonal chart
  • 4 other routes post a similar 70.4% 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.