BWI to ISP flight delays & on-time performance
Nonstop flights from Baltimore/Washington International Thurgood Marshall Airport to Long Island MacArthur Airport · 220 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at BWI or ISP right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Baltimore (BWI) to Islip (ISP) arrived on time 78% of the time in Aug 2025 – Jul 2026, in line with the national average.
- 1.9% were cancelled, and 6% arrived an hour or more late.
- Southwest Airlines is the only airline reporting nonstop flights on this route.
- Departures scheduled around 11am did best (92% on time); around 10pm did worst (56%).
- Tuesday was the most reliable day to fly (83% on time) and Sunday the least (67%).
- The largest source of delay minutes was late-arriving aircraft (50%).
Which airline is most on time from BWI to ISP?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Southwest Airlines | 78% | 1.9% | 12 min | 5.5% | 1,236 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 6am100%16 flights
- 7am96%25 flights
- 10am87%289 flights
- 11am92%76 flights
- 12pm83%35 flights
- 1pm80%55 flights
- 2pm81%80 flights
- 3pm84%161 flights
- 4pm64%71 flights
- 5pm64%22 flights
- 7pm77%32 flights
- 8pm79%101 flights
- 9pm76%86 flights
- 10pm56%177 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday78%3.3% cancelled
- Tuesday83%1.1% cancelled
- Wednesday82%0.6% cancelled
- Thursday76%0.6% cancelled
- Friday81%1.1% cancelled
- Saturday80%1.9% cancelled
- Sunday67%4.8% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft50%
- Airline (crew, maintenance, cleaning, fueling)37%
- Air traffic control & airport congestion7%
- Extreme weather6%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather61%
- Air traffic control & airport congestion22%
- Airline (crew, maintenance, cleaning, fueling)17%
- Security0%
BWI to ISP: common questions
- How often are BWI to ISP flights on time?
- 78% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Baltimore to Islip cancelled?
- 1.9% of scheduled flights were cancelled (23 of 1,236).
- How long are typical delays?
- Across all flights the average arrival delay was 12 min (early arrivals count as zero). Flights that were late arrived 50 min behind schedule on average, and 5.5% of flights were an hour or more late.
- How long is taxi time at BWI?
- Flights on this route spent 14 min taxiing from the gate to takeoff on average.
Related routes
Return trip: ISP to BWI — 85% on time
More flights from Baltimore
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: BWI → ISP, nonstop flights by US airlines that report to the DOT. How we calculate this.