BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
ISP→BWI

Islip, NY (ISP) to Baltimore, MD (BWI) flight delay odds

83.4% of 1,217 official scheduled ISP-to-BWI flights arrived on time; 8.7% arrived at least 30 minutes late and 1.5% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

HISTORICAL ROUTE SIGNALGenerally reliable
83.4%arrived on time
8.7%30+ min late
1.5%cancelled
1,217scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late4.3%all scheduled flights
120+ minutes late2.1%all scheduled flights
Diverted0.3%did not reach as scheduled
Average arrival+2.7 mincompleted flights

Which departure time was most reliable for ISP to BWI?

Among qualifying ISP-to-BWI departure window results, Early morning had the highest on-time rate: 93.5% of 397 flights. Evening was lowest at 71.3% across 143 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning39793.5%1.8%1.8%
Late morning14985.9%5.4%1.3%
Afternoon52878.4%12.7%0.6%
Evening14371.3%16.8%4.2%

Which weekday was most reliable for ISP to BWI?

Among qualifying ISP-to-BWI weekday results, Friday had the highest on-time rate: 87.3% of 181 flights. Monday was lowest at 79.6% across 181 flights.

DayFlightsOn time30+ minCancelled
Monday18179.6%9.9%4.4%
Tuesday18181.2%8.3%1.1%
Wednesday17686.9%6.8%0.6%
Thursday18281.9%13.7%0.5%
Friday18187.3%5.0%0.6%
Saturday15585.2%7.7%0.0%
Sunday16182.0%9.3%3.1%

Which airline was most reliable for ISP to BWI?

Only Southwest Airlines met the ISP-to-BWI airline threshold: 83.4% of 1,217 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines1,21783.4%8.7%1.5%

Which month was most reliable for ISP to BWI?

Among qualifying ISP-to-BWI month results, September 2025 had the highest on-time rate: 95.6% of 90 flights. July 2025 was lowest at 71.1% across 128 flights.

MonthFlightsOn time30+ minCancelled
July 202512871.1%16.4%2.3%
August 20259780.4%8.2%0.0%
September 20259095.6%3.3%0.0%
October 20259389.2%4.3%0.0%
November 20259085.6%7.8%2.2%
December 20259377.4%15.1%0.0%
January 20269383.9%5.4%4.3%
February 20268479.8%9.5%6.0%
March 20269073.3%15.6%3.3%
April 202610689.6%5.7%0.0%
May 202611493.9%4.4%0.0%
June 202613982.7%7.9%0.7%

What drove ISP to BWI delay minutes?

Late aircraft was the largest recorded ISP-to-BWI delay category, accounting for 45.4% of 11,634 BTS-attributed delay minutes during July 2025–June 2026.

Airline24.2%
Late aircraft45.4%
National airspace30.0%
Weather0.4%
Security0.0%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.