Route · ISP → BWI · 2020–2025 BTS data
Islip to Baltimore
The ISP–BWI corridor (Islip, NY → Baltimore, MD) runs ahead of the national average, served by 1 carrier across roughly 220 miles.
Data updated 2026-06-13
- 88.3%
- On-time
- +9.3 pts
- vs US avg
- 70 min
- Delay when late
- 7,390
- Flights
Cancelled
0.8%
Best Month
Sep 2025 96%
Worst Month
Jul 2025 75%
Distance
220 mi
Carriers
1
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 93 | 21 | 0 | 0 | WN |
| Nov 2025 | 90 | 11 | 2 | 0 | WN |
| Oct 2025 | 93 | 10 | 0 | 0 | WN |
| Sep 2025 | 90 | 4 | 0 | 0 | WN |
| Aug 2025 | 97 | 19 | 0 | 0 | WN |
| Jul 2025 | 128 | 32 | 3 | 2 | WN |
| Jun 2025 | 123 | 26 | 0 | 0 | WN |
| May 2025 | 114 | 27 | 0 | 0 | WN |
| Apr 2025 | 106 | 10 | 0 | 0 | WN |
| Mar 2025 | 89 | 11 | 2 | 0 | WN |
| Feb 2025 | 82 | 4 | 0 | 0 | WN |
| Jan 2025 | 89 | 9 | 1 | 0 | WN |
| Dec 2024 | 94 | 8 | 1 | 0 | WN |
| Nov 2024 | 89 | 6 | 0 | 0 | WN |
| Oct 2024 | 93 | 6 | 0 | 0 | WN |
| Sep 2024 | 94 | 6 | 0 | 0 | WN |
| Aug 2024 | 100 | 25 | 0 | 0 | WN |
| Jul 2024 | 127 | 31 | 4 | 0 | WN |
| Jun 2024 | 121 | 17 | 0 | 0 | WN |
| May 2024 | 116 | 20 | 0 | 0 | WN |
| Apr 2024 | 111 | 16 | 0 | 1 | WN |
| Mar 2024 | 108 | 17 | 0 | 0 | WN |
| Feb 2024 | 97 | 7 | 2 | 0 | WN |
| Jan 2024 | 112 | 16 | 4 | 0 | WN |
Cancellation Rate
0.8%
19 of 2,456 flights
Diversion Rate
0.1%
3 of 2,456 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
ISP - Islip
Full on-time, delay-cause, and seasonal performance for Islip, NY.
Origin airport →BWI - Baltimore
Full on-time, delay-cause, and seasonal performance for Baltimore, MD.
Destination airport →Compare the two airports
See ISP and BWI side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to ISP–BWI.
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What the Data Says About ISP to BWI
Islip to Baltimore (ISP to BWI) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 88.3% on-time rate across 7,390 flights, with delays that do happen averaging 69.7 minutes. The corridor runs roughly 220 miles and is served by 1 carrier. Over the most recent 24 months, 19 of 2,456 flights were cancelled (0.8%) and 3 diverted (0.1%).
The monthly split is wide on this route: Sep 2025 posted the strongest performance at 96% on-time, while Jul 2025 came in at just 75% - a 21-point swing worth factoring into travel timing.
Frequently Asked Questions
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Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.