Dulles (IAD) to San Juan (SJU) flights
United Airlines flies nonstop from Washington Dulles International Airport to Luis Munoz Marin International Airport, with about 14 flights a week in July 2026. The 1,572-mile flight takes about 3h 52m gate to gate.
- Distance
- 1,572 mi · 2,530 km
- Flight time
- 3h 52m
- Airlines
- 1
- Seats filled
- 88%
Airlines flying IAD to SJU
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| United Airlines | 14 | Boeing 737 MAX 9, Boeing 737 MAX 8, Boeing 737-900ER | 100,285 | 3h 52m |
| Frontier AirlinesSeasonal or ended | n/a | Airbus A321, Airbus A320neo, Airbus A320-100/200 | 11,855 | 3h 53m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
IAD to SJU flight schedule
2 flight numbers flew this route in August 2026, 1 of them almost daily. The first usually leaves at 9:00am and the last at 5:24pm. Times are local and can change; check with the airline before you book.
| Flight | Departs | Arrives | Days flown in August 2026 | On time (12 months) |
|---|---|---|---|---|
| UA 2021United Airlines | 9:00am | 12:54pm | 31 | 85% |
| UA 2025United Airlines | 5:24pm | 9:24pm | 10 | 70% |
Is IAD to SJU on time?
From September 2025 to August 2026, 76% of 698 flights arrived within 15 minutes of schedule and 0.6% were cancelled. Flights leaving around 8am were the most punctual (85%), those around 5pm the least (70%). Most delay time was caused by air traffic control and airport congestion (52%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| United Airlines | 636 | 78% | 13 min | 0.5% |
| Frontier Airlines | 62 | 51% | 90 min | 1.6% |
Airlines as sold: flights operated by regional partners count under the airline on the ticket. Average delay is across all completed flights, early arrivals counted as zero.
On-time arrivals by departure time
| Scheduled departure | Flights | On time, relative | On time |
|---|---|---|---|
| 8am to 9am | 329 | 85% | |
| 9am to 10am | 18 | 78% | |
| 5pm to 6pm | 289 | 70% | |
| 7pm to 8pm | 14 | 57% | |
| 8pm to 9pm | 31 | 43% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 50 | 7,829 | |
| September 2025 | 13 | 2,007 | |
| October 2025 | 44 | 6,345 | |
| November 2025 | 73 | 11,134 | |
| December 2025 | 77 | 13,382 | |
| January 2026 | 72 | 10,940 | |
| February 2026 | 63 | 10,496 | |
| March 2026 | 67 | 11,275 | |
| April 2026 | 62 | 9,438 | |
| May 2026 | 62 | 9,903 | |
| June 2026 | 60 | 9,524 | |
| July 2026 | 62 | 9,867 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.