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Route Reliability

ISP → Baltimore

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

87
Pretty Reliable
WanderNerd Reliability Score
85%
Arrive within 15 minutes
3 min
Average arrival delay
1.4%
Cancelled
1,201
Flights in the data

Data through May 2026.

Southwest Airlines is the only airline in this data on this route, arriving on time 85% of the time across 1,201 flights. No comparison to make.

What the data says

Morning-you made the right choice.

ISP–BWI flights departing between 6–9 AM arrived on time 96% of the time, versus 79% between 3–6 PM.

Wednesday has been the better bet.

A small edge: 89% on time on Wednesdays against 83% on Thursdays.

Ticking up lately.

ISP–BWI flights arrived on time 88% 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
  • Mon84%(173 flights)
  • Tue84%(170 flights)
  • Wed89%(172 flights)
  • Thu83%(181 flights)
  • Fri86%(179 flights)
  • Sat86%(151 flights)
  • Sun85%(154 flights)
On-time by departure window
  • 3–6 AM95%(128 flights)
  • 6–9 AM96%(256 flights)
  • 9 AM–12 PM89%(157 flights)
  • 12–3 PM79%(288 flights)
  • 3–6 PM79%(344 flights)
  • 6–9 PM—(7 flights)
On-time trend by month
96%
May

Jun 81% → May 96% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202581%123
July 202575%123
August 202583%97
September 202596%90
October 202590%93
November 202588%88
December 202577%93
January 202688%89
February 202686%78
March 202678%86
April 202691%106
May 202696%114

Keep nerding

Based on 1,201 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.