Route · ISP → BWI · 2020–2025 BTS data
Islip to Baltimore
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), ISP to BWI (Islip to Baltimore) ranks #1715 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 88.3%
- On-time
- +9.3 pts
- vs US avg
- 70 min
- Delay when late
- 7,390
- Flights
- #1715 of 4927
- Corpus placement
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 |
ISP–BWI seasonal on-time pattern
Best: February (94.5%) · weakest: July (81.6%)
Strongest calendar month
February
94.5% on-time · ~84 flights/mo
Busiest calendar month
July
~118 flights/mo avg
Weakest calendar month
July
81.6% on-time · ~118 flights/mo
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.
ISP on-time profileBWI - Baltimore
Full on-time, delay-cause, and seasonal performance for Baltimore, MD.
BWI on-time profileCompare the two airports
See ISP and BWI side by side on delays, cancellations, and reliability.
Compare ISP vs BWIOrigin-hub reliability standing
Among ISP's stronger departures
ISP → BWI posts a 88.3% on-time rate, landing in the ≥85% band with 1 of 5 BTS-tracked routes leaving Islip. The same hub also shows 3 mid-band and 1 challenged departures · fleet-wide on-time rank #364 of 4927 (highest on-time = #1).
Similar routes
Other BTS-tracked routes with comparable performance or trip length to ISP–BWI.
Routes with a similar on-time rate
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.
On the multi-year calendar, ISP–BWI peaks in February at 94.5% on-time while July carries the heaviest traffic (~118 flights per month) ; the softest month is July at 81.6%, a 12.9-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does ISP to BWI rank among US routes by traffic? ▼
How often are flights delayed from ISP to BWI? ▼
What is the cancellation rate for ISP to BWI? ▼
How far is the flight from ISP to BWI? ▼
When is the best time to fly from ISP to BWI? ▼
Airports on this route
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.
Using ISP–BWI data
ISP–BWI runs 9.3 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.
- Compare ISP and BWI airport profiles: delay causes and top routes differ even on the same corridor. ISP airport
- If your dates flex, February (94.5% on-time) beats July (81.6%) on this corridor. Seasonal chart
- 4 other routes post a similar 88.3% on-time rate; compare before you commit to this pairing. Similar routes
On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.
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.