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 → SDF
Baltimore to Louisville: 890 nonstop flights a year
On time (12 months)
79%
Cancelled
2.6%
avg delay 12 min
Best time to leave
9 AM to noon
87% on time vs 70% after 9 PM
Most reliable airline
Southwest
77% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Best trips
5 nonstop, 36 with 1 connection. Best overall weighs the chance you arrive on time as booked, connection odds, travel time and separate tickets.
Best overall#1 · Nonstop · 1h 50m
10:45 AM → 12:35 PM
86%
arrive on time
88% on time · 1.9% cancel10:45 AM BWI → 12:35 PM SDF1h 50m
Southwest 2137 · also flew as 2032
Boeing 737-700 · 3–23 yrs oldFind Southwest 2137 fares Opens this date on Aviasales#2 · Nonstop · 1h 50m
10:35 AM → 12:25 PM
85%
arrive on time
87% on time · 2.2% cancel10:35 AM BWI → 12:25 PM SDF1h 50m
Southwest 1536
Boeing 737-700 · 4–22 yrs oldFind Southwest 1536 fares Opens this date on Aviasales#3 · Nonstop · 1h 50m
9:55 PM → 11:45 PM
70%
arrive on time
71% on time · 1.9% cancel9:55 PM BWI → 11:45 PM SDF1h 50m
Southwest 1319
Boeing 737-800 or 737 MAX 8 · 2–19 yrs oldFind Southwest 1319 fares Opens this date on Aviasales#4 · Nonstop · 1h 45m
3:05 PM → 4:50 PM
68%
arrive on time
69% on time · 2.2% cancel3:05 PM BWI → 4:50 PM SDF1h 45m
Southwest 1317
Boeing 737-700 · 17–23 yrs oldFind Southwest 1317 fares Opens this date on Aviasales#5 · Nonstop · 1h 55m
10:45 PM → 12:40 AM
67%
arrive on time
69% on time · 2.7% cancel10:45 PM BWI → 12:40 AM SDF1h 55m
Southwest 3211
Boeing 737 MAX 8 or 737-800 · 3–19 yrs oldFind Southwest 3211 fares Opens this date on Aviasales#6 · 1 connection · 5h 25m · one ticket (Southwest)
6:15 AM → 11:40 AM
97%
connections made
79%
arrive on time
89% on time · 1.2% cancel6:15 AM BWI → 7:10 AM BNA1h 55m
Southwest 2659 · also flew as 2652
Boeing 737 MAX 8 or 737-800 · 1–20 yrs oldConnect in BNA · 2h 25m · 98% chance to make it · same ticket: the airline rebooks you if you miss it82% on time · 0.5% cancel9:35 AM BNA → 11:40 AM SDF1h 05m
Southwest 1463
Boeing 737-800 · 5–12 yrs oldFind this Southwest trip Look for Southwest 2659 + Southwest 1463 on Aviasales#7 · 1 connection · 4h 28m · one ticket (Delta)
5:40 AM → 10:10 AM
92%
connections made
75%
arrive on time
93% on time · 2.0% cancel5:40 AM BWI → 7:19 AM DTW1h 37m
Delta 2601
Boeing 717 or Airbus A320 · 23–33 yrs oldConnect in DTW · 1h 21m · 96% chance to make it · same ticket: the airline rebooks you if you miss it81% on time · 1.7% cancel8:40 AM DTW → 10:10 AM SDF1h 30m
SkyWest 3821 · sold as Delta Connection
Bombardier CRJ900 · 7–20 yrs oldFind this Delta trip Look for Delta 2601 + SkyWest 3821 on Aviasales#8 · 1 connection · 4h 17m · one ticket (Delta)
5:40 AM → 9:59 AM
92%
connections made
74%
arrive on time
93% on time · 2.0% cancel5:40 AM BWI → 7:19 AM DTW1h 37m
Delta 2601
Boeing 717 or Airbus A320 · 23–33 yrs oldConnect in DTW · 1h 11m · 95% chance to make it · same ticket: the airline rebooks you if you miss it80% on time · 1.3% cancel8:30 AM DTW → 9:59 AM SDF1h 29m
SkyWest 3993 · sold as Delta Connection
Bombardier CRJ900 · 5–19 yrs oldFind this Delta trip Look for Delta 2601 + SkyWest 3993 on Aviasales#9 · 1 connection · 6h 10m · one ticket (Southwest)
9:40 AM → 3:50 PM
98%
connections made
79%
arrive on time
91% on time · 1.3% cancel9:40 AM BWI → 10:40 AM BNA2h 00m
Southwest 1051
Boeing 737 MAX 8 or 737-800 · 1–12 yrs oldConnect in BNA · 3h 05m · 99% chance to make it · same ticket: the airline rebooks you if you miss it81% on time · 0.4% cancel1:45 PM BNA → 3:50 PM SDF1h 05m
Southwest 941 · also flew as 3363
Boeing 737-700 or 737-800 · 4–22 yrs oldFind this Southwest trip Look for Southwest 1051 + Southwest 941 on Aviasales#10 · 1 connection · 5h 05m · one ticket (Southwest)
9:40 AM → 2:45 PM
95%
connections made
75%
arrive on time
91% on time · 1.3% cancel9:40 AM BWI → 10:40 AM BNA2h 00m
Southwest 1051
Boeing 737 MAX 8 or 737-800 · 1–12 yrs oldConnect in BNA · 2h 00m · 97% chance to make it · same ticket: the airline rebooks you if you miss it79% on time · 0.5% cancel12:40 PM BNA → 2:45 PM SDF1h 05m
Southwest 1683
Boeing 737-700 · 15–22 yrs oldFind this Southwest trip Look for Southwest 1051 + Southwest 1683 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 Airlines77%
890 flights · 79% on time as flown · 2.6% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- 9 AM to noon87%
364 flights · avg delay 7 min
- 3 to 6 PM73%
156 flights · avg delay 15 min
- 6 to 9 PM82%
96 flights · avg delay 11 min
- After 9 PM70%
272 flights · avg delay 19 min
Best day: Tuesday (86%). Worst: Sunday (70%).
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