ATIS Alerts Smart Flight Search
Find the flight least likely to be delayed
BetaWe rank real flight numbers by how often they flew and arrived on time over the last 12 months, adjusted for your travel month and departure time, then check nearby airports and calmer connections. US airlines and airports.
PBI → BWI
West Palm Beach to Baltimore: 1,234 nonstop flights a year
On time (12 months)
81%
Cancelled
1.4%
avg delay 14 min
Best time to leave
Before 9 AM
95% on time vs 67% 6 to 9 PM
Most reliable airline
Southwest
80% 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 4145
6:45 AM → 9:10 AM2h 25m nonstop
Local times, typical schedule. Last flown 2026-05-31.
93%
chance on time
- On time (history)
- 96%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 96% 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 (Before 9 AM: 95% on time; 6 to 9 PM: 67%).
- Departs outside PBI's trouble window (11 AM to 5 PM, when 84% of its 31 ground stops and delay programs started).
Limited track record · 55 flights
Find Southwest 4145 fares Opens this date on Aviasales#2 · Southwest 930
7:00 AM → 9:25 AM2h 25m nonstop
Local times, typical schedule. Last flown 2026-04-06.
91%
chance on time
- On time (history)
- 97%
- Cancelled
- 6.1%
- Avg arrival delay
- 9 min
- Arrived on time 97% of the time (31 flights, Jun 2025 to May 2026).
- Cancelled 6.1% of the time (2 of 33).
- Leaves in this route's most on-time window (Before 9 AM: 95% on time; 6 to 9 PM: 67%).
- Departs outside PBI's trouble window (11 AM to 5 PM, when 84% of its 31 ground stops and delay programs started).
Limited track record · 31 flights
Find Southwest 930 fares Opens this date on Aviasales#3 · Southwest 3171
12:10 PM → 2:40 PM2h 30m nonstop
Local times, typical schedule. Last flown 2026-05-31.
83%
chance on time
- On time (history)
- 87%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 87% of the time (23 flights, Jun 2025 to May 2026).
- Departs inside PBI's trouble window: 84% of its 31 ground stops and delay programs started between 11 AM and 5 PM.
- Lands 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 3171 fares Opens this date on Aviasales#4 · Southwest 1276
11:40 AM → 2:10 PM2h 30m nonstop
Local times, typical schedule. Last flown 2026-05-30. Same departure also flew as Southwest 1200; its record covers all of them.
83%
chance on time
- On time (history)
- 87%
- Cancelled
- 3.1%
- Avg arrival delay
- 5 min
- Arrived on time 87% of the time (61 flights, Jun 2025 to May 2026).
- Cancelled 3.1% of the time (2 of 64).
- Departs inside PBI's trouble window: 84% of its 31 ground stops and delay programs started between 11 AM and 5 PM.
- Lands inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
Moderate track record · 61 flights
Find Southwest 1276 fares Opens this date on Aviasales#5 · Southwest 4158
7:15 PM → 9:45 PM2h 30m nonstop
Local times, typical schedule. Last flown 2026-04-06.
76%
chance on time
- On time (history)
- 77%
- Cancelled
- 6.1%
- Avg arrival delay
- 26 min
- Arrived on time 77% of the time (31 flights, Jun 2025 to May 2026).
- Cancelled 6.1% of the time (2 of 33).
- Leaves in this route's least on-time window (6 to 9 PM: 67% on time; Before 9 AM: 95%).
- Departs outside PBI's trouble window (11 AM to 5 PM, when 84% of its 31 ground stops and delay programs started).
Limited track record · 31 flights
Find Southwest 4158 fares Opens this date on Aviasales#6 · Southwest 3699
6:25 PM → 8:55 PM2h 30m nonstop
Local times, typical schedule. Last flown 2026-05-31.
73%
chance on time
- On time (history)
- 76%
- Cancelled
- 0.0%
- Avg arrival delay
- 12 min
- Arrived on time 76% of the time (55 flights, Jun 2025 to May 2026).
- Never cancelled in 55 scheduled flights.
- Leaves in this route's least on-time window (6 to 9 PM: 67% on time; Before 9 AM: 95%).
- Departs outside PBI's trouble window (11 AM to 5 PM, when 84% of its 31 ground stops and delay programs started).
Limited track record · 55 flights
Find Southwest 3699 fares Opens this date on Aviasales#7 · Southwest 1924
3:05 PM → 5:35 PM2h 30m nonstop
Local times, typical schedule. Last flown 2026-04-06.
72%
chance on time
- On time (history)
- 64%
- Cancelled
- 0.0%
- Avg arrival delay
- 28 min
- Arrived on time 64% of the time (33 flights, Jun 2025 to May 2026).
- Never cancelled in 33 scheduled flights.
- Departs inside PBI's trouble window: 84% of its 31 ground stops and delay programs started between 11 AM and 5 PM.
- Lands inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
Limited track record · 33 flights
Find Southwest 1924 fares Opens this date on Aviasales#8 · Southwest 1674
4:15 PM → 6:45 PM2h 28m nonstop
Local times, typical schedule. Last flown 2026-05-31.
68%
chance on time
- On time (history)
- 67%
- Cancelled
- 0.0%
- Avg arrival delay
- 12 min
- Arrived on time 67% of the time (46 flights, Jun 2025 to May 2026).
- Never cancelled in 46 scheduled flights.
- Departs inside PBI's trouble window: 84% of its 31 ground stops and delay programs started between 11 AM and 5 PM.
- Lands inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
Limited track record · 46 flights
Find Southwest 1674 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines80%
1,234 flights · 81% on time as flown · 1.4% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM95%
365 flights · avg delay 5 min
- 9 AM to noon82%
239 flights · avg delay 11 min
- Noon to 3 PM78%
160 flights · avg delay 10 min
- 3 to 6 PM71%
254 flights · avg delay 20 min
- 6 to 9 PM67%
216 flights · avg delay 29 min
Best day: Tuesday (85%). Worst: Sunday (77%).
Smarter routing
Nearby airports that run more on time
FLL → IAD 85% chance on time
Fort Lauderdale Hollywood International Airport to Washington Dulles International Airport · 743 flights a year · 87 mi from your airports · yours: 80%
PBI → IAD 83% chance on time
Palm Beach International Airport to Washington Dulles International Airport · 333 flights a year · 45 mi from your airports · yours: 80%
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