Showing Southwest only (incl. its regional partners)All airlines ×

1,235 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 96% depart on time. After 4 pm it’s 7 in 10.

Best time to leave 9–10 am 98% arrive on time from ISP

Time of day × airport

Share of this route’s flights leaving within 15 minutes, by airport and scheduled departure hour, over Aug 2025 – Jul 2026. Blank: no flights then (or fewer than 40 in the year).

ISP

% of this route’s flights leaving within 15 min (small number: flights in the Jun 6 – Jul 31, 2026 schedule): 85+75–8465–7455–64under 55

Pick an hour to see this route’s flights leaving then.

Flights, best and worst

Flights in the Jun 6 – Jul 31, 2026 schedule that ran 150+ times in the year. Times are local. Pick a flight for its history.

No Southwest flight on this route ran 150+ times in the year.

All 5 Southwest flights in the current schedule

Every flight that flew in the Jun 6 – Jul 31, 2026 schedule, with its record over Aug 2025 – Jul 2026. Times are local. Click a column to sort.


WN 2141	ISP 06:00	BWI 07:15	1h 15m	57	91%	1.8%	63 min
WN 4584	ISP 09:10	BWI 10:25	1h 15m	42	95%	2.4%	62 min
WN 2143	ISP 12:30	BWI 13:45	1h 15m	57	79%	1.8%	51 min
WN 921	ISP 15:05	BWI 16:20	1h 15m	42	76%	0.0%	76 min
WN 2145	ISP 17:50	BWI 19:05	1h 15m	54	62%	3.7%	65 min

Nonstops by airline and airport

Arriving within 15 minutes, Aug 2025 – Jul 2026. Pick a row to see that airline’s flights on that airport pair.


Southwest	ISP	BWI	1h 20m	86%	1.5%	1,235	Flying now

Flying on a particular day? Pick a date above and the same ranking uses our forecast odds for each flight that day: Tomorrow.

About this data: US DOT on-time records, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. Schedules (which flights and connections exist, and their times) are as of Jun 6 – Jul 31, 2026; seasonal flights outside that window aren’t ranked. Rebuilt monthly. JSON