Route on-time record
BWI to ISP: most on-time flights and the best time to fly
Baltimore (Baltimore/Washington International Thurgood Marshall Airport) to Islip (Long Island MacArthur Airport). 1,203 nonstop flights in Jun 2025 to May 2026, 76% arrived within 15 minutes and 1.9% were cancelled. The most reliable flight number was Southwest 2202 at 10:30 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
BWI → ISP
Baltimore to Islip: 1,203 nonstop flights a year
On time (12 months)
76%
Cancelled
1.9%
avg delay 13 min
Best time to leave
9 AM to noon
85% on time vs 61% after 9 PM
Most reliable airline
Southwest
75% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · Southwest 2202
10:30 AM → 11:40 AM1h 10m nonstop
Local times, typical schedule. Last flown 2026-04-06. Same departure also flew as Southwest 2814; its record covers all of them.
85%
chance on time
- On time (history)
- 92%
- Cancelled
- 2.6%
- Avg arrival delay
- 5 min
- Arrived on time 92% of the time (36 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (9 AM to noon: 85% on time; After 9 PM: 61%).
- Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).
- Short track record (36 flights), so its score leans on the airline's record at this hour.
Limited track record · 36 flights
Find Southwest 2202 fares Opens this date on Aviasales#2 · Southwest 1156
10:40 AM → 11:50 AM1h 10m nonstop
Local times, typical schedule. Last flown 2026-05-31.
84%
chance on time
- On time (history)
- 87%
- Cancelled
- 0.0%
- Avg arrival delay
- 7 min
- Arrived on time 87% of the time (55 flights, Jun 2025 to May 2026).
- Never cancelled in 55 scheduled flights.
- Leaves in this route's most on-time window (9 AM to noon: 85% on time; After 9 PM: 61%).
- Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).
Limited track record · 55 flights
Find Southwest 1156 fares Opens this date on Aviasales#3 · Southwest 2080
3:20 PM → 4:30 PM1h 10m nonstop
Local times, typical schedule. Last flown 2026-05-29.
78%
chance on time
- On time (history)
- 78%
- Cancelled
- 0.0%
- Avg arrival delay
- 15 min
- Arrived on time 78% of the time (23 flights, Jun 2025 to May 2026).
- Departs inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
- Short track record (23 flights), so its score leans on the airline's record at this hour.
Limited track record · 23 flights
Find Southwest 2080 fares Opens this date on Aviasales#4 · Southwest 1266
12:40 PM → 1:50 PM1h 10m nonstop
Local times, typical schedule. Last flown 2026-05-27.
77%
chance on time
- On time (history)
- 81%
- Cancelled
- 0.0%
- Avg arrival delay
- 13 min
- Arrived on time 81% of the time (16 flights, Jun 2025 to May 2026).
- Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).
- 87% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (16 flights), so its score leans on the airline's record at this hour.
Limited track record · 16 flights
Find Southwest 1266 fares Opens this date on Aviasales#5 · Southwest 2413
7:10 PM → 8:25 PM1h 15m nonstop
Local times, typical schedule. Last flown 2026-05-29.
73%
chance on time
- On time (history)
- 77%
- Cancelled
- 0.0%
- Avg arrival delay
- 16 min
- Arrived on time 77% of the time (22 flights, Jun 2025 to May 2026).
- Departs inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
- Short track record (22 flights), so its score leans on the airline's record at this hour.
Limited track record · 22 flights
Find Southwest 2413 fares Opens this date on Aviasales#6 · Southwest 2357
5:15 PM → 6:30 PM1h 13m nonstop
Local times, typical schedule. Last flown 2026-05-31.
73%
chance on time
- On time (history)
- 75%
- Cancelled
- 0.0%
- Avg arrival delay
- 17 min
- Arrived on time 75% of the time (32 flights, Jun 2025 to May 2026).
- Never cancelled in 32 scheduled flights.
- Departs inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
- Short track record (32 flights), so its score leans on the airline's record at this hour.
Limited track record · 32 flights
Find Southwest 2357 fares Opens this date on Aviasales#7 · Southwest 3566
4:10 PM → 5:20 PM1h 10m nonstop
Local times, typical schedule. Last flown 2026-04-03.
72%
chance on time
- On time (history)
- 76%
- Cancelled
- 4.5%
- Avg arrival delay
- 12 min
- Arrived on time 76% of the time (21 flights, Jun 2025 to May 2026).
- Departs inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
- Short track record (21 flights), so its score leans on the airline's record at this hour.
Limited track record · 21 flights
Find Southwest 3566 fares Opens this date on Aviasales#8 · Southwest 3161
10:20 PM → 11:30 PM1h 10m nonstop
Local times, typical schedule. Last flown 2026-05-30.
62%
chance on time
- On time (history)
- 64%
- Cancelled
- 0.0%
- Avg arrival delay
- 23 min
- Arrived on time 64% of the time (47 flights, Jun 2025 to May 2026).
- Never cancelled in 47 scheduled flights.
- Leaves in this route's least on-time window (After 9 PM: 61% on time; 9 AM to noon: 85%).
- Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).
Limited track record · 47 flights
Find Southwest 3161 fares Opens this date on Aviasales#9 · Southwest 1840
10:40 PM → 11:50 PM1h 10m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 2053; its record covers all of them.
54%
chance on time
- On time (history)
- 47%
- Cancelled
- 5.0%
- Avg arrival delay
- 32 min
- Arrived on time 47% of the time (38 flights, Jun 2025 to May 2026).
- Cancelled 5.0% of the time (2 of 40).
- Leaves in this route's least on-time window (After 9 PM: 61% on time; 9 AM to noon: 85%).
- Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).
Limited track record · 38 flights
Find Southwest 1840 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines75%
1,203 flights · 76% on time as flown · 1.9% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- 9 AM to noon85%
365 flights · avg delay 7 min
- Noon to 3 PM80%
135 flights · avg delay 10 min
- 3 to 6 PM75%
245 flights · avg delay 15 min
- 6 to 9 PM73%
166 flights · avg delay 15 min
- After 9 PM61%
263 flights · avg delay 20 min
Best day: Tuesday (80%). Worst: Sunday (65%).
Smarter routing
Nearby airports that run more on time
DCA → EWR 87% chance on time
Ronald Reagan Washington National Airport to Newark Liberty International Airport · 333 flights a year · 86 mi from your airports · yours: 75%
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Late-arriving aircraft48%
- Airline (crew, maintenance, boarding)43%
- Air traffic control and airport volume6%
- Severe weather3%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
BWI to ISP questions
- What time of day is best to fly BWI to ISP?
- 9 AM to noon: 85% of flights arrived on time, against 61% for departures after 9 PM.
- Which airline is most on time from BWI to ISP?
- Southwest, with a season-adjusted 75% chance of operating and arriving on time over 1,203 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on BWI to ISP?
- July (61% on time); the best was February (88%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from BWI
- ISP to BWI (return)
- BWI to ATL 79%
- BWI to MCO 75%
- BWI to BOS 74%
- BWI to FLL 75%
- BWI to CLT 80%
- BWI to DEN 76%
- BWI to TPA 79%
- BWI to ORD 75%
- BWI to MIA 74%
- BWI to DTW 81%
- BWI to PVD 78%
- BWI to BNA 80%
Live status: FAA delays and ground stops