Route
MIA → IAD
Miami International Airport Washington Dulles International Airport
922 miles
Return route IAD → MIA →
How punctual is this route?
- On-time arrivals
- 84.4%
- Less than 15 minutes late
- Cancelled
- 0.7%
- Of scheduled flights
- Average delay when late
- 72 min
- Flights arriving 15+ minutes late
- Flights tracked
- 603
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 51%
- Air traffic control & airport 25%
- Airline (crew, maintenance, cleaning) 20%
- Extreme weather 4%
- 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 | 93.6% | 47 |
| October 2025 | 85.7% | 49 |
| November 2025 | 72.7% | 44 |
| December 2025 | 87.9% | 58 |
| January 2026 | 81.9% | 76 |
| February 2026 | 77.0% | 61 |
| March 2026 | 69.8% | 63 |
| April 2026 | 86.6% | 68 |
| May 2026 | 93.3% | 45 |
| June 2026 | 100.0% | 30 |
| July 2026 | 96.8% | 31 |
| August 2026 | 83.9% | 31 |
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 | 512 | 84.7% | 0.4% | 77 min |
| Frontier Airlines | 91 | 83.1% | 2.2% | 50 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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