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Route Reliability

Baltimore → ISP

BWI–ISP · 220 miles · Baltimore/Washington International Thurgood Marshall Airport to ISP Airport

76
Usually Fine
WanderNerd Reliability Score
77%
Arrive within 15 minutes
8 min
Average arrival delay
1.9%
Cancelled
1,203
Flights in the data

Data through May 2026.

Southwest Airlines is the only airline in this data on this route, arriving on time 77% of the time across 1,203 flights. No comparison to make.

What the data says

Morning-you made the right choice.

BWI–ISP flights departing between 6–9 AM arrived on time 100% of the time, versus 63% between 9 PM–12 AM.

Sunday scaries are real for this one.

BWI–ISP flights arrived on time 81% of the time on Tuesdays and just 64% on Sundays. That gap is worth planning around.

Recent months have been rougher.

BWI–ISP flights arrived on time 75% of the time over the last three months in the data, compared with 84% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon77%(173 flights)
  • Tue81%(170 flights)
  • Wed79%(172 flights)
  • Thu77%(177 flights)
  • Fri80%(178 flights)
  • Sat80%(153 flights)
  • Sun64%(152 flights)
On-time by departure window
  • 6–9 AM100%(29 flights)
  • 9 AM–12 PM86%(360 flights)
  • 12–3 PM81%(133 flights)
  • 3–6 PM77%(236 flights)
  • 6–9 PM73%(164 flights)
  • 9 PM–12 AM63%(253 flights)
On-time trend by month
71%
May

Jun 65% → May 71% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202565%123
July 202566%119
August 202575%97
September 202584%90
October 202587%92
November 202581%89
December 202574%90
January 202690%90
February 202686%80
March 202671%84
April 202683%107
May 202671%114

Keep nerding

Based on 1,203 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.