Route Reliability
San Juan → Washington
SJU–IAD · 1,572 miles · Luis Muñoz Marín International Airport to Washington Dulles International Airport
- 86%
- Arrive within 15 minutes
- 0 min
- Average arrival delay
- 0.7%
- Cancelled
- 688
- Flights in the data
Data through May 2026.
Who flies it best
Ranked by on-time arrivals. Historical results, not predictions.
- 1.United Airlines89%588 flights
- 2.Frontier Airlines68%100 flights
What the data says
Morning-you made the right choice.
SJU–IAD flights departing between 6–9 AM arrived on time 94% of the time, versus 80% between 3–6 PM.
Skip Saturday if you can.
SJU–IAD flights arrived on time 91% of the time on Wednesdays. On Saturdays: 82%.
United Airlines has a clear lead on this route.
United Airlines arrived on time 89% of the time on this route; Frontier Airlines managed 68%.
Ticking up lately.
SJU–IAD flights arrived on time 90% of the time over the last three months in the data, compared with 85% in the three months before that.
Best historical flights
Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.
Top flights by on-time rate
The breakdown
- Mon86%(101 flights)
- Tue88%(91 flights)
- Wed91%(77 flights)
- Thu84%(102 flights)
- Fri88%(89 flights)
- Sat82%(98 flights)
- Sun83%(123 flights)
- 6–9 AM94%(286 flights)
- 12–3 PM—(2 flights)
- 3–6 PM80%(393 flights)
Jun 86% → May 89% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 86% | 50 |
| July 2025 | 79% | 52 |
| August 2025 | 72% | 50 |
| September 2025 | 100% | 13 |
| October 2025 | 84% | 43 |
| November 2025 | 88% | 73 |
| December 2025 | 83% | 77 |
| January 2026 | 90% | 69 |
| February 2026 | 83% | 63 |
| March 2026 | 88% | 67 |
| April 2026 | 94% | 62 |
| May 2026 | 89% | 62 |
Same trip, other airports
Keep nerding
Based on 688 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.