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Route Reliability

Washington → Miami

IAD–MIA · 922 miles · Washington Dulles International Airport to Miami International Airport

84
Pretty Reliable
WanderNerd Reliability Score
80%
Arrive within 15 minutes
7 min
Average arrival delay
1.0%
Cancelled
668
Flights in the data

Data through May 2026.

Who flies it best

Ranked by on-time arrivals. Historical results, not predictions.

  1. 1.United Airlines86%512 flights
  2. 2.Frontier Airlines61%156 flights

What the data says

Morning flights do better here.

IAD–MIA flights departing between 6–9 AM arrived on time 87% of the time, versus 49% between 6–9 PM.

Thursdays have been rough.

IAD–MIA flights arrived on time 93% of the time on Wednesdays and just 73% on Thursdays. That gap is worth planning around.

United Airlines has a clear lead on this route.

United Airlines arrived on time 86% of the time on this route; Frontier Airlines managed 61%.

Ticking up lately.

IAD–MIA flights arrived on time 87% of the time over the last three months in the data, compared with 80% 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

More flights on this route

The breakdown

On-time by weekday
  • Mon78%(111 flights)
  • Tue87%(71 flights)
  • Wed93%(72 flights)
  • Thu73%(101 flights)
  • Fri80%(110 flights)
  • Sat83%(93 flights)
  • Sun74%(102 flights)
On-time by departure window
  • 6–9 AM87%(301 flights)
  • 9 AM–12 PM83%(60 flights)
  • 12–3 PM82%(152 flights)
  • 3–6 PM75%(69 flights)
  • 6–9 PM49%(41 flights)
  • 9 PM–12 AM57%(37 flights)
On-time trend by month
98%
May

Jun 67% → May 98% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202567%52
July 202564%50
August 202576%53
September 202594%47
October 202588%49
November 202575%44
December 202583%58
January 202676%72
February 202682%61
March 202679%63
April 202684%67
May 202698%44

Same trip, other airports

Keep nerding

Based on 668 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.