Sun, Oct 4 has passed, so this is the 12-month record.

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

Connect in the morning. The same 80-minute layover misses 5% of the time at 10 am and 31% of the time at 7 pm.

Nonstops (seasonal or thin)


United	IAD	SDF	1h 51m	84%	1.0%	889	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.


United Details →	IAD 06:30 → DEN 08:22UA 2031	1h 23m Denver	DEN 09:45 → SDF 14:28UA 1479	7h 58m	100%	89%
United Details →	IAD 06:33 → EWR 07:52UA 2147	2h 13m Newark	EWR 10:05 → SDF 12:21UA 3421 · flown by Republic	5h 48m	100%	84%
Delta Details →	IAD 06:00 → ATL 07:46DL 2127	2h 44m Atlanta	ATL 10:30 → SDF 11:53DL 1481	5h 53m	97%	82%
Delta Details →	IAD 12:37 → ATL 14:34DL 1444	3h 25m Atlanta	ATL 17:59 → SDF 19:24DL 2831	6h 47m	97%	79%
United Details →	IAD 06:10 → ORD 07:27UA 2070	3h 33m Chicago	ORD 11:00 → SDF 13:35UA 5467 · flown by SkyWest	7h 25m	100%	77%
Delta Details →	IAD 17:51 → ATL 19:54DL 1695	3h 08m Atlanta	ATL 23:02 → SDF 00:26 +1DL 2624	6h 37m	95%	77%
Delta Details →	IAD 08:27 → ATL 10:17DL 3080	3h 50m Atlanta	ATL 14:07 → SDF 15:31DL 3195	7h 04m	98%	76%
American Details →	IAD 06:14 → DFW 08:35AA 2617	56m Dallas-Fort Worth	DFW 09:31 → SDF 12:48AA 3791 · flown by Envoy	6h 34m	82%	74%
Tight connection: often missed
Delta Details →	IAD 15:02 → ATL 16:54DL 2135	1h 05m Atlanta	ATL 17:59 → SDF 19:24DL 2831	4h 22m	74%	62%
United Details →	IAD 17:42 → EWR 19:10UA 1831	1h 15m Newark	EWR 20:25 → SDF 22:50UA 3512 · flown by Republic	5h 08m	69%	33%
United Details →	IAD 15:39 → ORD 17:02UA 1393	48m Chicago	ORD 17:50 → SDF 20:23UA 3598 · flown by Republic	4h 44m	44%	32%

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 05m · leaves 06:00 8%

DFW · 57m · leaves 06:14 17%

Afternoon and evening

CLT · 1h 07m · leaves 20:22 23%

ATL · 1h 05m · leaves 15:02 26%

EWR · 1h 15m · leaves 17:42 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.


United UA 641 IAD 08:35 → BOS American AA 3438 BOS 13:59 → SDF Connection details →	3h 39m	8h 05m	100%	83%
United UA 471 IAD 12:35 → ATL Delta DL 2831 ATL 17:59 → SDF Connection details →	3h 25m	6h 49m	95%	80%
United UA 2081 IAD 17:17 → ATL Delta DL 2624 ATL 23:02 → SDF Connection details →	3h 46m	7h 11m	96%	79%

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