PlainFlights

Route · BWI → ISP · 2020–2025 BTS data

Baltimore to Islip

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), BWI to ISP (Baltimore to Islip) ranks #1711 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

76.7%
On-time
-2.3 pts
vs US avg
55 min
Delay when late
7,398
Flights
#1711 of 4927
Corpus placement

Cancelled

1.1%

Best Month

Feb 2025 90%

Worst Month

Jul 2024 61%

Distance

220 mi

Carriers

1

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 93 25 1 2 WN
Nov 2025 91 18 2 0 WN
Oct 2025 93 13 0 1 WN
Sep 2025 90 15 0 0 WN
Aug 2025 97 26 0 0 WN
Jul 2025 128 43 8 1 WN
Jun 2025 123 45 0 0 WN
May 2025 114 36 0 0 WN
Apr 2025 106 22 0 0 WN
Mar 2025 89 21 2 0 WN
Feb 2025 82 8 0 0 WN
Jan 2025 90 15 1 0 WN
Dec 2024 94 25 1 0 WN
Nov 2024 89 11 0 0 WN
Oct 2024 93 17 1 0 WN
Sep 2024 94 13 0 0 WN
Aug 2024 100 35 0 0 WN
Jul 2024 127 49 4 0 WN
Jun 2024 121 36 1 1 WN
May 2024 115 42 0 0 WN
Apr 2024 111 25 2 0 WN
Mar 2024 108 28 0 0 WN
Feb 2024 97 13 1 0 WN
Jan 2024 112 43 2 0 WN

BWI–ISP seasonal on-time pattern

Best: February (85.9%) · weakest: July (68.4%)

65%70%75%80%85%90% JanFebMarAprMayJunJulAugSepOctNovDec 73.7%

Strongest calendar month

February

85.9% on-time · ~84 flights/mo

Busiest calendar month

July

~119 flights/mo avg

Weakest calendar month

July

68.4% on-time · ~119 flights/mo

Cancellation Rate

1.1%

26 of 2,457 flights

Diversion Rate

0.2%

5 of 2,457 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

BWI - Baltimore

Full on-time, delay-cause, and seasonal performance for Baltimore, MD.

BWI on-time profile

ISP - Islip

Full on-time, delay-cause, and seasonal performance for Islip, NY.

ISP on-time profile

Compare the two airports

See BWI and ISP side by side on delays, cancellations, and reliability.

Compare BWI vs ISP

Origin-hub reliability standing

Mid-pack among BWI departures

From BWI, this corridor sits with 53 other 75–85% on-time routes out of 64 tracked departures, not the hub's reliability leaders (0 at ≥85%) and not the softest ( 11 below 75%). Destination: Islip · fleet on-time rank #4152 of 4927.

What the Data Says About BWI to ISP

The Baltimore to Islip corridor (BWI to ISP) posts a 76.7% on-time rate on the lower edge of the average band, based on 7,398 tracked flights. Late flights run 55.3 minutes behind on average. 1 carrier cover the 220-mile route; over the last 24 months, 26 of 2,457 flights were cancelled (1.1%) and 0.2% diverted.

The monthly split is wide on this route: Feb 2025 posted the strongest performance at 90% on-time, while Jul 2024 came in at just 61% - a 29-point swing worth factoring into travel timing.

On the multi-year calendar, BWI–ISP peaks in February at 85.9% on-time while July carries the heaviest traffic (~119 flights per month) ; the softest month is July at 68.4%, a 17.5-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does BWI to ISP rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, BWI to ISP ranks #1711 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from BWI to ISP? ▼
Flights from Baltimore to Islip have a 76.7% on-time rate based on 7,398 flights. The average delay is 55.3 minutes. The best recent month was Feb 2025 with 90% on-time.
What is the cancellation rate for BWI to ISP? ▼
Over the last 24 months, 1.1% of flights on this route were cancelled (26 of 2,457 flights) and 0.2% were diverted.
How far is the flight from BWI to ISP? ▼
The flight distance from Baltimore (BWI) to Islip (ISP) is approximately 220 miles. This route is served by 1 carrier.
When is the best time to fly from BWI to ISP? ▼
The best recent month for on-time performance was Feb 2025 (90% on-time). The worst was Jul 2024 (61% on-time). Consider booking during months with historically better performance.

Airports on this route

BWI Airport

Baltimore
ISP Airport

Islip
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 BWI–ISP data

BWI–ISP is mid-pack at 76.7% on-time; month and carrier mix move more than the corridor headline.

  • Compare BWI and ISP airport profiles: delay causes and top routes differ even on the same corridor. BWI airport
  • If your dates flex, February (85.9% on-time) beats July (68.4%) on this corridor. Seasonal chart
  • 4 other routes post a similar 76.7% 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.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

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.