Itineraries flown on 20+ days in the Jun 6 – Jul 31, 2026 schedule · each leg’s record Aug 2025 – Jul 2026

No clear winner: Southwest’s BWI → SDF flights land within a few points of 4 in 5 on time whatever the hour.

Nonstops (seasonal or thin)


Southwest	BWI	SDF	1h 50m	81%	2.1%	890	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Louisville on time. Total trip = scheduled departure to arrival, layover included. Layovers up to 4 hours. Pick a connection for the details.


Southwest Details →	BWI 06:25 → BNA 07:20WN 874	2h 45m Nashville	BNA 10:05 → SDF 12:00WN 670	5h 35m	100%	85%
Delta Details →	BWI 05:40 → ATL 07:31DL 2950	1h 39m Atlanta	ATL 09:10 → SDF 10:29DL 1374	4h 52m	97%	83%
Delta Details →	BWI 07:00 → ATL 08:56DL 2579	1h 34m Atlanta	ATL 10:30 → SDF 11:53DL 1481	4h 53m	97%	82%
Southwest Details →	BWI 09:35 → MDW 10:35WN 4217	2h 10m Chicago	MDW 12:45 → SDF 14:55WN 4473	5h 20m	97%	82%
American Details →	BWI 05:44 → ORD 07:12AA 4659 · flown by Republic	48m Chicago	ORD 08:00 → SDF 10:35AA 4704 · flown by Republic	4h 52m	90%	81%
Delta Details →	BWI 17:00 → ATL 19:08DL 2799	3h 54m Atlanta	ATL 23:02 → SDF 00:26 +1DL 2624	7h 28m	98%	80%
Delta Details →	BWI 06:17 → BOS 08:00DL 5813 · flown by Republic	1h 28m Boston	BOS 09:28 → SDF 12:09DL 5615 · flown by Republic	5h 54m	98%	79%
American Details →	BWI 07:30 → DFW 09:55AA 1403	2h 12m Dallas-Fort Worth	DFW 12:07 → SDF 15:22AA 3758 · flown by Envoy	7h 52m	96%	79%
Tight connection: often missed
American Details →	BWI 20:16 → CLT 21:55AA 1637	1h 07m Charlotte	CLT 23:02 → SDF 00:31 +1AA 671	4h 16m	69%	47%
United Details →	BWI 18:38 → ORD 20:02UA 791	1h 23m Chicago	ORD 21:25 → SDF 23:59UA 3659 · flown by Republic	5h 21m	69%	43%

Same layover, different day-part

How often the first flight arrives too late to connect (45 min minimum), for one-ticket layovers of 45–80 minutes.

Morning

MSP · 1h 04m · leaves 06:19 8%

ORD · 48m · leaves 05:44 10%

DTW · 1h 06m · leaves 09:39 12%

Afternoon and evening

CLT · 1h 07m · leaves 20:16 31%

Delays build through the day, so an afternoon first leg eats the layover. A short connection is fine early in the morning and a gamble later on.

Mixing airlines

One ticketMiss it and the airline rebooks you; bags go through. 45 min is enough.

Separate ticketsMiss it and you buy a new ticket. Re-check bags, clear security again: we require 90 min.


Southwest WN 4689 BWI 06:20 → ATL Delta DL 1481 ATL 10:30 → SDF Connection details →	2h 15m	5h 33m	100%	87%
Delta DL 5703 BWI 09:00 → BOS American AA 3438 BOS 13:59 → SDF Connection details →	3h 20m	7h 40m	98%	80%
Southwest WN 148 BWI 08:15 → CLT American AA 5397 CLT 13:26 → SDF Connection details →	3h 31m	6h 48m	100%	77%

Rank all connections, any airlines →

Regional partners count as the airline that sells them: SkyWest flying Delta Connection is one Delta ticket.

How these are worked out. Makes the connection: share of the last year’s flights where the first flight arrived with at least 45 minutes to spare (90 on separate tickets). Arrives on time: first flight not cancelled × connection made × second flight not cancelled and arriving within 15 minutes. Not yet counted: the second flight also leaving late (which helps), gate-to-gate distance at the hub, and rebooking after a missed connection.

About this data: US DOT on-time records, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. Schedules (which flights and connections exist, and their times) are as of Jun 6 – Jul 31, 2026; seasonal flights outside that window aren’t ranked. Rebuilt monthly. JSON