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Route Reliability

St. Louis → San Juan

STL–SJU · 2,024 miles · St. Louis Lambert International Airport to Luis Muñoz Marín International Airport

41
Bring Snacks
WanderNerd Reliability Score
50%
Arrive within 15 minutes
19 min
Average arrival delay
3.2%
Cancelled
31
Flights in the data

Data through May 2026.

Southwest Airlines is the only airline in this data on this route, arriving on time 50% of the time across 31 flights. No comparison to make.

Flights on this route

The breakdown

On-time by weekday
  • Mon—(0 flights)
  • Tue—(0 flights)
  • Wed—(0 flights)
  • Thu—(0 flights)
  • Fri—(0 flights)
  • Sat50%(30 flights)
  • Sun—(0 flights)
On-time by departure window
  • 6–9 AM—(7 flights)
  • 9 AM–12 PM44%(18 flights)
  • 12–3 PM—(5 flights)

Keep nerding

Based on 31 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.