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Route Reliability

San Juan → Detroit

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

85
Pretty Reliable
WanderNerd Reliability Score
85%
Arrive within 15 minutes
1 min early
Average arrival delay
1.5%
Cancelled
396
Flights in the data

Data through May 2026.

Airlines on this route

  • Delta Air Lines86% on time · 324 flights
  • Spirit Airlines83% 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

Morning flights do better here.

SJU–DTW flights departing between 12–3 AM arrived on time 91% of the time, versus 77% between 3–6 PM.

Sunday scaries are real for this one.

SJU–DTW flights arrived on time 89% of the time on Fridays. On Sundays: 81%.

Trending in the right direction.

SJU–DTW flights arrived on time 89% of the time over the last three months in the data, compared with 78% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon88%(65 flights)
  • Tue84%(45 flights)
  • Wed84%(44 flights)
  • Thu82%(56 flights)
  • Fri89%(64 flights)
  • Sat86%(56 flights)
  • Sun81%(58 flights)
On-time by departure window
  • 12–3 AM91%(34 flights)
  • 9 AM–12 PM88%(16 flights)
  • 12–3 PM90%(196 flights)
  • 3–6 PM77%(142 flights)
On-time trend by month
94%
May

Jun 88% → May 94% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202588%42
July 202593%57
August 202576%38
September 202590%19
October 202592%13
November 202588%25
December 202576%42
January 202668%34
February 202689%28
March 202683%30
April 202690%29
May 202694%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.