ISP to BWI flight delays & on-time performance
Nonstop flights from Long Island MacArthur Airport to Baltimore/Washington International Thurgood Marshall Airport · 220 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at ISP or BWI right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Islip (ISP) to Baltimore (BWI) arrived on time 85% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 1.5% were cancelled, and 4% arrived an hour or more late.
- Southwest Airlines is the only airline reporting nonstop flights on this route.
- Departures scheduled around 9am did best (98% on time); around 2pm did worst (60%).
- Friday was the most reliable day to fly (88% on time) and Monday the least (83%).
- The largest source of delay minutes was late-arriving aircraft (47%).
Which airline is most on time from ISP to BWI?
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 | 85% | 1.5% | 11 min | 4.1% | 1,235 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 5am95%131 flights
- 6am94%234 flights
- 8am93%41 flights
- 9am98%54 flights
- 10am76%21 flights
- 11am83%62 flights
- 12pm83%236 flights
- 1pm95%20 flights
- 2pm60%49 flights
- 3pm75%125 flights
- 4pm83%118 flights
- 5pm76%136 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday83%3.9% cancelled
- Tuesday84%1.7% cancelled
- Wednesday85%0.0% cancelled
- Thursday83%0.5% cancelled
- Friday88%0.5% cancelled
- Saturday85%1.3% cancelled
- Sunday86%3.0% 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 aircraft47%
- Airline (crew, maintenance, cleaning, fueling)23%
- Air traffic control & airport congestion23%
- Extreme weather7%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather58%
- Air traffic control & airport congestion32%
- Airline (crew, maintenance, cleaning, fueling)11%
- Security0%
ISP to BWI: common questions
- How often are ISP to BWI flights on time?
- 85% 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 Islip to Baltimore cancelled?
- 1.5% of scheduled flights were cancelled (19 of 1,235).
- How long are typical delays?
- Across all flights the average arrival delay was 11 min (early arrivals count as zero). Flights that were late arrived 65 min behind schedule on average, and 4.1% of flights were an hour or more late.
- How long is taxi time at ISP?
- Flights on this route spent 11 min taxiing from the gate to takeoff on average.
Related routes
Return trip: BWI to ISP — 78% on time
More flights from Islip
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: ISP → BWI, nonstop flights by US airlines that report to the DOT. How we calculate this.