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Route Reliability

San Juan → Baltimore

SJU–BWI · 1,565 miles · Luis Muñoz Marín International Airport to Baltimore/Washington International Thurgood Marshall Airport

73
Usually Fine
WanderNerd Reliability Score
77%
Arrive within 15 minutes
9 min
Average arrival delay
2.4%
Cancelled
1,209
Flights in the data

Data through May 2026.

Who flies it best

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

  1. 1.Southwest Airlines80%826 flights
  2. 2.Spirit Airlines76%235 flights
  3. 3.Frontier Airlines65%148 flights

What the data says

Morning-you made the right choice.

SJU–BWI flights departing between 3–6 AM arrived on time 90% of the time, versus 55% between 6–9 PM.

Friday is doing you no favors.

SJU–BWI flights arrived on time 81% of the time on Sundays. On Fridays: 73%.

Southwest Airlines runs this route best.

Southwest Airlines arrived on time 80% of the time on this route; Frontier Airlines managed 65%.

Slipping a little lately.

SJU–BWI flights arrived on time 71% of the time over the last three months in the data, compared with 77% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon74%(169 flights)
  • Tue80%(143 flights)
  • Wed80%(153 flights)
  • Thu80%(167 flights)
  • Fri73%(168 flights)
  • Sat74%(190 flights)
  • Sun81%(183 flights)
On-time by departure window
  • 12–3 AM77%(34 flights)
  • 3–6 AM90%(183 flights)
  • 6–9 AM84%(301 flights)
  • 9 AM–12 PM85%(101 flights)
  • 12–3 PM74%(99 flights)
  • 3–6 PM70%(340 flights)
  • 6–9 PM55%(75 flights)
  • 9 PM–12 AM68%(40 flights)
On-time trend by month
81%
May

Jun 79% → May 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202579%131
July 202572%138
August 202582%102
September 202584%70
October 202593%60
November 202584%74
December 202584%112
January 202681%99
February 202667%85
March 202664%103
April 202668%110
May 202681%89

Same trip, other airports

Keep nerding

Based on 1,209 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.