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Route Reliability

Detroit → San Juan

DTW–SJU · 1,930 miles · Detroit Metropolitan Wayne County Airport to Luis Muñoz Marín International Airport

80
Pretty Reliable
WanderNerd Reliability Score
77%
Arrive within 15 minutes
6 min
Average arrival delay
0.8%
Cancelled
396
Flights in the data

Data through May 2026.

Airlines on this route

  • Delta Air Lines76% on time · 324 flights
  • Spirit Airlines82% on time · 72 flights

Too little history on this route to call a winner. We rank airlines only after 100 flights each.

What the data says

Departure time hasn't mattered much.

On-time rates stay between 75% and 77% across the day.

Monday is the weak spot.

DTW–SJU flights arrived on time 82% of the time on Thursdays. On Mondays: 73%.

Trending in the right direction.

DTW–SJU flights arrived on time 81% of the time over the last three months in the data, compared with 66% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon73%(66 flights)
  • Tue76%(45 flights)
  • Wed74%(46 flights)
  • Thu82%(54 flights)
  • Fri80%(64 flights)
  • Sat81%(57 flights)
  • Sun73%(59 flights)
On-time by departure window
  • 6–9 AM77%(338 flights)
  • 9 AM–12 PM75%(52 flights)
  • 6–9 PM—(1 flights)
On-time trend by month
84%
May

Jun 85% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202585%41
July 202581%58
August 202584%38
September 202576%21
October 202592%13
November 202568%25
December 202563%43
January 202656%34
February 202679%28
March 202677%30
April 202683%29
May 202684%31

Keep nerding

Based on 396 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.