Route · IAD → SJU · 2020–2025 BTS data
Washington to San Juan
The IAD–SJU corridor (Washington, DC → San Juan, PR) runs ahead of the national average, served by 3 carriers across roughly 1,571 miles.
Data updated 2026-06-13
- 82.9%
- On-time
- +3.9 pts
- vs US avg
- 75 min
- Delay when late
- 2,240
- Flights
Cancelled
0.5%
Best Month
Mar 2025 89%
Worst Month
Jul 2025 60%
Distance
1,571 mi
Carriers
3
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 77 | 29 | 0 | 0 | F9,UA |
| Nov 2025 | 73 | 23 | 0 | 0 | UA,F9 |
| Oct 2025 | 44 | 9 | 0 | 0 | UA,F9 |
| Aug 2025 | 50 | 15 | 0 | 0 | F9,UA |
| Jul 2025 | 53 | 21 | 1 | 0 | UA,F9 |
| Jun 2025 | 50 | 13 | 0 | 0 | UA,F9 |
| May 2025 | 38 | 6 | 0 | 0 | UA,F9 |
| Apr 2025 | 38 | 3 | 0 | 0 | UA |
| Mar 2025 | 61 | 7 | 0 | 0 | UA |
| Feb 2025 | 56 | 13 | 0 | 0 | UA |
| Jan 2025 | 62 | 18 | 1 | 0 | UA |
| Dec 2024 | 44 | 12 | 0 | 0 | UA |
| Nov 2024 | 30 | 3 | 0 | 0 | UA |
| Oct 2024 | 31 | 2 | 0 | 0 | UA |
| Aug 2024 | 37 | 9 | 0 | 0 | UA |
| Jul 2024 | 39 | 10 | 0 | 0 | UA |
| Jun 2024 | 40 | 5 | 0 | 0 | UA |
| May 2024 | 33 | 1 | 0 | 0 | UA |
| Apr 2024 | 38 | 1 | 0 | 1 | UA |
| Mar 2024 | 40 | 5 | 0 | 0 | UA |
| Feb 2024 | 33 | 2 | 0 | 0 | UA |
| Jan 2024 | 42 | 9 | 3 | 0 | UA |
| Dec 2023 | 49 | 5 | 0 | 0 | UA |
| Nov 2023 | 30 | 1 | 0 | 1 | UA |
Cancellation Rate
0.5%
5 of 1,088 flights
Diversion Rate
0.2%
2 of 1,088 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
IAD - Washington
Full on-time, delay-cause, and seasonal performance for Washington, DC.
Origin airport →SJU - San Juan
Full on-time, delay-cause, and seasonal performance for San Juan, PR.
Destination airport →Compare the two airports
See IAD and SJU side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to IAD–SJU.
Routes with a similar on-time rate
What the Data Says About IAD to SJU
Bureau of Transportation Statistics records show Washington to San Juan (IAD to SJU) running a 82.9% on-time rate over 2,240 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 74.9 minutes. The 1,571-mile corridor is served by 3 carriers, and over the last 24 months 0.5% of 1,088 flights were cancelled, 0.2% diverted.
The monthly split is wide on this route: Mar 2025 posted the strongest performance at 89% on-time, while Jul 2025 came in at just 60% - a 28-point swing worth factoring into travel timing.
Frequently Asked Questions
How often are flights delayed from IAD to SJU? ▼
What is the cancellation rate for IAD to SJU? ▼
How far is the flight from IAD to SJU? ▼
When is the best time to fly from IAD to SJU? ▼
Flight Guides
Tips and data-driven advice for choosing reliable routes.
Explore PlainFlights
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.
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.