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Route Reliability

Baltimore → San Juan

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

62
A Little Dicey
WanderNerd Reliability Score
68%
Arrive within 15 minutes
20 min
Average arrival delay
2.4%
Cancelled
1,208
Flights in the data

Data through May 2026.

Who flies it best

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

  1. 1.Spirit Airlines72%235 flights
  2. 2.Southwest Airlines71%825 flights
  3. 3.Frontier Airlines49%148 flights

What the data says

Morning-you made the right choice.

BWI–SJU flights departing between 6–9 AM arrived on time 79% of the time, versus 40% between 9 PM–12 AM.

Sunday scaries are real for this one.

BWI–SJU flights arrived on time 79% of the time on Wednesdays and just 61% on Sundays. That gap is worth planning around.

Spirit Airlines has a clear lead on this route.

Spirit Airlines arrived on time 72% of the time on this route; Frontier Airlines managed 49%.

Ticking up lately.

BWI–SJU flights arrived on time 73% of the time over the last three months in the data, compared with 67% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon65%(171 flights)
  • Tue76%(141 flights)
  • Wed79%(150 flights)
  • Thu64%(170 flights)
  • Fri68%(174 flights)
  • Sat69%(187 flights)
  • Sun61%(186 flights)
On-time by departure window
  • 6–9 AM79%(441 flights)
  • 9 AM–12 PM69%(127 flights)
  • 12–3 PM61%(135 flights)
  • 3–6 PM57%(14 flights)
  • 6–9 PM62%(447 flights)
  • 9 PM–12 AM40%(15 flights)
On-time trend by month
70%
May

Jun 69% → May 70% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202569%134
July 202557%136
August 202559%102
September 202581%70
October 202575%61
November 202573%74
December 202562%114
January 202671%96
February 202668%87
March 202673%105
April 202675%110
May 202670%90

Same trip, other airports

Keep nerding

Based on 1,208 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.