Miami (MIA) to Washington (IAD): On-Time Performance
Data through July 2026
The calendar drives reliability on MIA–IAD. June 2026 flights landed on schedule 100% of the time, but August 2024 dropped to 58% — a gap of 42 points. Across the full period the route averages 82% on-time against a national 78%. Morning departures also hold up better than evening ones (89% vs 76%), which matters most in the rough months.
- On-time
- 82%
- arrived <15 min late
- Avg delay
- 16 min
- completed flights
- Cancelled
- 0.7%
- Flights/day
- 1.7
- last 12 months
- Duration
- 2h 40m
- scheduled
- Distance
- 922 mi
Best airline from MIA to IAD
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 84% | 13 min | 0.4% | 1,051 |
| Frontier Airlines | 70% | 29 min | 2.4% | 166 |
Monthly on-time trend
Best time to fly from MIA to IAD
Aim for departures around 8 a.m. (91% on-time); avoid 6 p.m. departures (75%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 83% | 21 min |
| Tuesdaybest | 90% | 9 min |
| Wednesday | 89% | 7 min |
| Thursday | 82% | 14 min |
| Friday | 81% | 14 min |
| Saturday | 79% | 18 min |
| Sunday | 72% | 23 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft40%
- Airline operations19%
- National airspace system26%
- Weather15%
Frequently asked questions
- How often are flights from MIA to IAD delayed?
- 18% of MIA–IAD flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 16 minutes.
- Which airline is most reliable from MIA to IAD?
- United Airlines has the best on-time record on this route at 84%, based on 1,051 flights. 2 airlines flew MIA–IAD frequently enough to compare in this period.
- What is the best time of day to fly from MIA to IAD?
- Departures around 8 a.m. have the best record (91% on-time), while departures around 6 p.m. have the worst (75%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from MIA to IAD?
- The scheduled MIA–IAD flight time averages 2h 40m over 922 miles. Actual arrival times vary — flights on this route land 15+ minutes late 18% of the time.
- How often are MIA to IAD flights cancelled?
- 0.7% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from MIA to IAD?
- August 2024 was the roughest month in this dataset, with only 58% of arrivals on time. The best was June 2026 at 100%. If your dates are flexible, that 42-point gap is worth planning around.
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Based on 1,217 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.