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.
BWI → PIT
Baltimore to Pittsburgh: 1,074 nonstop flights a year
On time (12 months)
78%
Cancelled
1.8%
avg delay 14 min
Best time to leave
9 AM to noon
90% on time vs 62% after 9 PM
Most reliable airline
Southwest
76% chance on time
Lowest nonstop fare seen in the next two months: $331 (Southwest 4381 on 2026-10-23). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Best trips
8 nonstop. Best overall weighs the chance you arrive on time as booked, connection odds, travel time and separate tickets.
Best overall#1 · Nonstop · 1h 05m
10:45 AM → 11:50 AM
87%
arrive on time
88% on time · 1.5% cancel10:45 AM BWI → 11:50 AM PIT1h 05m
Southwest 1573
Boeing 737-800 or 737 MAX 8 · 3–21 yrs oldFind Southwest 1573 fares Opens this date on Aviasales#2 · Nonstop · 1h 05m
10:55 AM → 12:00 PM
87%
arrive on time
88% on time · 1.5% cancel10:55 AM BWI → 12:00 PM PIT1h 05m
Southwest 470
Boeing 737-700 · 18–22 yrs oldFind Southwest 470 fares Opens this date on Aviasales#3 · Nonstop · 1h 05m
10:30 AM → 11:35 AM
84%
arrive on time
85% on time · 1.5% cancel10:30 AM BWI → 11:35 AM PIT1h 05m
Southwest 2122
Boeing 737-700 · 2–22 yrs oldFind Southwest 2122 fares Opens this date on Aviasales#4 · Nonstop · 1h 05m
5:00 PM → 6:05 PM
74%
arrive on time
75% on time · 1.7% cancel5:00 PM BWI → 6:05 PM PIT1h 05m
Southwest 2726
Boeing 737-700 · 16–23 yrs oldFind Southwest 2726 fares Opens this date on Aviasales#5 · Nonstop · 1h 05m
6:50 PM → 8:00 PM
73%
arrive on time
74% on time · 1.3% cancel6:50 PM BWI → 8:00 PM PIT1h 05m
Southwest 1261
Boeing 737-800 or 737 MAX 8 · 1–19 yrs oldFind Southwest 1261 fares Opens this date on Aviasales#6 · Nonstop · 1h 05m
5:30 PM → 6:35 PM
71%
arrive on time
72% on time · 1.5% cancel5:30 PM BWI → 6:35 PM PIT1h 05m
Southwest 1687
Boeing 737-700 · 18–23 yrs oldFind Southwest 1687 fares Opens this date on Aviasales#7 · Nonstop · 1h 10m
10:00 PM → 11:10 PM
66%
arrive on time
67% on time · 1.3% cancel10:00 PM BWI → 11:10 PM PIT1h 10m
Southwest 452
Boeing 737-800 or 737 MAX 8 · 1–13 yrs oldFind Southwest 452 fares Opens this date on Aviasales#8 · Nonstop · 1h 10m
10:30 PM → 11:40 PM
63%
arrive on time
65% on time · 3.1% cancel10:30 PM BWI → 11:40 PM PIT1h 10m
Southwest 2405
Boeing 737-700 · 3–22 yrs oldFind Southwest 2405 fares Opens this date on Aviasales
Aircraft and ages come from the planes each flight number actually flew in the last 3 months of data (FAA registry build years); airlines can swap planes.
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines76%
1,074 flights · 78% on time as flown · 1.8% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- 9 AM to noon90%
365 flights · avg delay 6 min
- 3 to 6 PM74%
297 flights · avg delay 18 min
- 6 to 9 PM86%
142 flights · avg delay 6 min
- After 9 PM62%
269 flights · avg delay 25 min
Best day: Tuesday (81%). Worst: Sunday (68%).
Smarter routing
Nearby airports that run more on time
IAD → PIT 82% chance on time
Washington Dulles International Airport to Pittsburgh International Airport · 1,282 flights a year · 45 mi from your airports · yours: 76%
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