Route on-time record
SDF to BWI: most on-time flights and the best time to fly
Louisville (Louisville Muhammad Ali International Airport) to Baltimore (Baltimore/Washington International Thurgood Marshall Airport). 890 nonstop flights in Jun 2025 to May 2026, 86% arrived within 15 minutes and 2.4% were cancelled. The most reliable flight number was Southwest 4186 at 5:45 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
SDF → BWI
Louisville to Baltimore: 890 nonstop flights a year
On time (12 months)
86%
Cancelled
2.4%
avg delay 12 min
Best time to leave
Before 9 AM
96% on time vs 75% 3 to 6 PM
Most reliable airline
Southwest
84% 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 4186
5:45 AM → 7:20 AM1h 35m nonstop
Local times, typical schedule. Last flown 2026-05-31.
95%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 0 min
- Arrived on time 100% 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: 96% on time; 3 to 6 PM: 75%).
- Short track record (55 flights), so its score leans on the airline's record at this hour.
Limited track record · 55 flights
Find Southwest 4186 fares Opens this date on Aviasales#2 · Southwest 4416
5:25 AM → 7:00 AM1h 35m nonstop
Local times, typical schedule. Last flown 2026-04-06.
90%
chance on time
- On time (history)
- 91%
- Cancelled
- 3.0%
- Avg arrival delay
- 16 min
- Arrived on time 91% of the time (32 flights, Jun 2025 to May 2026).
- Cancelled 3.0% of the time (1 of 33).
- Leaves in this route's most on-time window (Before 9 AM: 96% on time; 3 to 6 PM: 75%).
- Short track record (32 flights), so its score leans on the airline's record at this hour.
Limited track record · 32 flights
Find Southwest 4416 fares Opens this date on Aviasales#3 · Southwest 1654
11:10 AM → 12:45 PM1h 35m nonstop
Local times, typical schedule. Last flown 2026-05-29.
89%
chance on time
- On time (history)
- 96%
- Cancelled
- 0.0%
- Avg arrival delay
- 2 min
- Arrived on time 96% of the time (23 flights, Jun 2025 to May 2026).
- Short track record (23 flights), so its score leans on the airline's record at this hour.
Limited track record · 23 flights
Find Southwest 1654 fares Opens this date on Aviasales#4 · Southwest 1324
3:45 PM → 5:25 PM1h 40m nonstop
Local times, typical schedule. Last flown 2026-05-27.
81%
chance on time
- On time (history)
- 81%
- Cancelled
- 0.0%
- Avg arrival delay
- 20 min
- Arrived on time 81% of the time (16 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (3 to 6 PM: 75% on time; Before 9 AM: 96%).
- 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 (16 flights), so its score leans on the airline's record at this hour.
Limited track record · 16 flights
Find Southwest 1324 fares Opens this date on Aviasales#5 · Southwest 121
4:25 PM → 6:05 PM1h 40m nonstop
Local times, typical schedule. Last flown 2026-05-30. Same departure also flew as Southwest 941; its record covers all of them.
79%
chance on time
- On time (history)
- 76%
- Cancelled
- 0.0%
- Avg arrival delay
- 12 min
- Arrived on time 76% of the time (21 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (3 to 6 PM: 75% on time; Before 9 AM: 96%).
- Lands inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
- 80% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 21 flights
Find Southwest 121 fares Opens this date on Aviasales#6 · Southwest 2413
4:45 PM → 6:30 PM1h 45m nonstop
Local times, typical schedule. Last flown 2026-05-29.
79%
chance on time
- On time (history)
- 77%
- Cancelled
- 0.0%
- Avg arrival delay
- 8 min
- Arrived on time 77% of the time (22 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (3 to 6 PM: 75% on time; Before 9 AM: 96%).
- 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 (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#7 · Southwest 2308
5:10 PM → 6:50 PM1h 40m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 1925; its record covers all of them.
68%
chance on time
- On time (history)
- 61%
- Cancelled
- 0.0%
- Avg arrival delay
- 29 min
- Arrived on time 61% of the time (28 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (3 to 6 PM: 75% on time; Before 9 AM: 96%).
- 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 (28 flights), so its score leans on the airline's record at this hour.
Limited track record · 28 flights
Find Southwest 2308 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines84%
890 flights · 86% on time as flown · 2.4% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM96%
365 flights · avg delay 9 min
- 9 AM to noon89%
122 flights · avg delay 5 min
- Noon to 3 PM88%
68 flights · avg delay 9 min
- 3 to 6 PM75%
307 flights · avg delay 16 min
Best day: Monday (90%). Worst: Friday (81%).
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
- Airline (crew, maintenance, boarding)38%
- Late-arriving aircraft35%
- Air traffic control and airport volume27%
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
SDF to BWI questions
- What time of day is best to fly SDF to BWI?
- Before 9 AM: 96% of flights arrived on time, against 75% for departures 3 to 6 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from SDF to BWI?
- Southwest, with a season-adjusted 84% chance of operating and arriving on time over 890 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 SDF to BWI?
- July (71% on time); the best was November (92%), 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 SDF
- BWI to SDF (return)
- SDF to ORD 79%
- SDF to ATL 89%
- SDF to DFW 74%
- SDF to CLT 82%
- SDF to DTW 82%
- SDF to DEN 83%
- SDF to LGA 83%
- SDF to DCA 79%
- SDF to MDW 85%
- SDF to EWR 86%
- SDF to MCO 81%
- SDF to BOS 70%
Live status: FAA delays and ground stops