Route
SJU → IAD
Luis Munoz Marin International Airport Washington Dulles International Airport
1,572 miles
Return route IAD → SJU →
How punctual is this route?
- On-time arrivals
- 88.7%
- Less than 15 minutes late
- Cancelled
- 0.7%
- Of scheduled flights
- Average delay when late
- 78 min
- Flights arriving 15+ minutes late
- Flights tracked
- 698
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 40%
- Airline (crew, maintenance, cleaning) 39%
- Air traffic control & airport 19%
- Extreme weather 1%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Sep 2025
Aug 2026
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 100.0% | 13 |
| October 2025 | 83.7% | 43 |
| November 2025 | 87.7% | 73 |
| December 2025 | 83.1% | 77 |
| January 2026 | 89.9% | 74 |
| February 2026 | 82.5% | 63 |
| March 2026 | 86.6% | 67 |
| April 2026 | 93.5% | 62 |
| May 2026 | 87.1% | 62 |
| June 2026 | 93.3% | 60 |
| July 2026 | 93.5% | 62 |
| August 2026 | 95.2% | 42 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| United Airlines | 636 | 91.6% | 0.6% | 63 min |
| Frontier Airlines | 62 | 59.0% | 1.6% | 109 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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