Route profile
BWI→ISP
Flight reliability, delays and best times to fly from Baltimore to Islip. · 220 miles
Right now
Current conditions at both ends of this route.
Aviation weather is not currently a factor.
FlyerIntel does not currently have live operational data for this airport.
Airport conditions describe the airfield, not any individual flight. An airport operating normally is not a guarantee that a specific flight will depart on time.
Route reliability
July 2023 – June 2026
Better than 44% of comparable major US routes (4,577 compared)
Calculated from 3,857 flights. How this is calculated
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – June 2026
Best time to fly
On-time arrival rate by scheduled local departure time.
BWI → ISP flights departing 5–9 AM arrived on time 90.5% of the time, against 59.8% for 9 PM–5 AM departures — a gap of 30.7 percentage points.
By departure window
By departure hour
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – June 2026 · Buckets with fewer than 120 flights are not scored.
Airlines on this route
Performance by the carrier that actually operated the flight.
| Carrier | Flights | On time | Cancelled | Median delay | Severe |
|---|---|---|---|---|---|
| Southwest Airlines | 3,857 | 74.8% | 1.14% | -1 min | 6.5% |
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – June 2026 · Carriers with fewer than 200 flights on this route are not listed.
Other ways to fly Washington to New York
Airport pairs serving the same journey, grouped by the DOT's own city-market definition. They do not perform the same way.
| Route | Flights | On time | Cancelled | Median delay | Score |
|---|---|---|---|---|---|
| DCA→LGA Washington to New York | 13,818 | 74.3% | 4.19% | -6 min | 41 |
| DCA→JFK Washington to New York | 7,502 | 78.9% | 4.31% | -8 min | 51 |
| IAD→EWR Washington to Newark | 4,471 | 73.6% | 2.59% | -5 min | 43 |
| IAD→LGA Washington to New York | 2,730 | 76.0% | 4.32% | -8 min | 50 |
| IAD→JFK Washington to New York | 1,322 | 73.4% | 3.03% | -6 min | 45 |
| DCA→EWR Washington to Newark | 888 | 89.7% | 3.83% | -14 min | 70 |
DCA → EWR is the most reliable pairing for this journey at 89.7% on time, against 74.3% for DCA → LGA.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – June 2026 · Grouped by DOT city market, which places Newark with the New York airports and Baltimore with the Washington ones.
Weekly and seasonal patterns
By day of week
Tuesday is historically the most reliable day and Sunday the least, a gap of 15.4 percentage points.
By month
July is historically the weakest month and February the strongest, a spread of 26.9 percentage points.
Historical trend
On-time arrival rate by month.
Over the most recent 12 months (2025-07 to 2026-06), on-time arrivals averaged 77.4% against 75.0% in the 12 months before — improving by 2.4 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – June 2026
Data and methodology
All figures on this page are calculated by FlyerIntel from 3,857 BWI → ISP flight records published by the US DOT Bureau of Transportation Statistics, covering July 2023 – June 2026. A flight is counted as delayed when it arrives 15 or more minutes after its scheduled arrival time, following BTS methodology. Cancelled and diverted flights have no arrival time and are excluded from on-time rates rather than counted as late.