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Route Reliability

Miami → San Juan

MIA–SJU · 1,045 miles · Miami International Airport to Luis Muñoz Marín International Airport

76
Usually Fine
WanderNerd Reliability Score
75%
Arrive within 15 minutes
13 min
Average arrival delay
1.1%
Cancelled
2,629
Flights in the data

Data through May 2026.

Who flies it best

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

  1. 1.American Airlines77%2,048 flights
  2. 2.Frontier Airlines72%376 flights
  3. 3.Spirit Airlines57%205 flights

What the data says

Morning flights do better here.

MIA–SJU flights departing between 6–9 AM arrived on time 89% of the time, versus 57% between 9 PM–12 AM.

Sunday scaries are real for this one.

MIA–SJU flights arrived on time 81% of the time on Wednesdays. On Sundays: 66%.

American Airlines has a clear lead on this route.

American Airlines arrived on time 77% of the time on this route; Spirit Airlines managed 57%.

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
  • Mon77%(390 flights)
  • Tue80%(317 flights)
  • Wed81%(315 flights)
  • Thu74%(389 flights)
  • Fri76%(410 flights)
  • Sat71%(360 flights)
  • Sun66%(416 flights)
On-time by departure window
  • 3–6 AM64%(22 flights)
  • 6–9 AM89%(648 flights)
  • 9 AM–12 PM81%(423 flights)
  • 12–3 PM68%(608 flights)
  • 3–6 PM69%(389 flights)
  • 6–9 PM67%(318 flights)
  • 9 PM–12 AM57%(189 flights)
On-time trend by month
86%
May

Jun 77% → May 86% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202577%202
July 202564%214
August 202569%209
September 202579%168
October 202573%176
November 202577%211
December 202581%255
January 202673%236
February 202676%207
March 202669%274
April 202674%231
May 202686%214

Same trip, other airports

Keep nerding

Based on 2,629 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.