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 one-hour layover misses 14% of the time at 8 am and 1 time in 4 at 4 pm.

Nonstops


United	SDF	IAH	2h 30m	84%	1.0%	1,072	Flying now
American	SDF	IAH	–	0%few flights	0.0%	1	Not flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Houston on time. Total trip = scheduled departure to arrival, layover included (Houston is 1 h behind Louisville). Layovers up to 4 hours. Pick a connection for the details.


United Details →	SDF 09:00 → ORD 09:38UA 3696 · flown by Republic	3h 02m Chicago	ORD 12:40 → IAH 15:40UA 1448	7h 40m	100%	88%
United Details →	SDF 07:15 → ORD 07:56UA 3422 · flown by Republic	2h 29m Chicago	ORD 10:25 → IAH 13:23UA 2638	7h 08m	98%	84%
Delta Details →	SDF 08:10 → ATL 09:40DL 2299	2h 50m Atlanta	ATL 12:30 → IAH 13:38DL 1572	6h 28m	98%	84%
American Details →	SDF 05:04 → CLT 06:41AA 5255 · flown by PSA	1h 01m Charlotte	CLT 07:42 → IAH 09:25AA 1930	5h 21m	89%	82%
United Details →	SDF 06:00 → IAD 07:35UA 3438 · flown by Republic	1h 05m Dulles	IAD 08:40 → IAH 10:59UA 1524	5h 59m	93%	81%
American Details →	SDF 11:05 → ORD 11:44AA 4704 · flown by Republic	1h 45m Chicago	ORD 13:29 → IAH 16:27AA 4426 · flown by Republic	6h 20m	99%	79%
Delta Details →	SDF 06:00 → ATL 07:25DL 2407	2h 40m Atlanta	ATL 10:05 → IAH 11:18DL 1682	6h 18m	99%	79%
United Details →	SDF 10:04 → ORD 10:40UA 5629 · flown by SkyWest	3h 35m Chicago	ORD 14:15 → IAH 17:20UA 2451	8h 16m	100%	78%
Tight connection: often missed
United Details →	SDF 09:00 → ORD 09:38UA 3696 · flown by Republic	47m Chicago	ORD 10:25 → IAH 13:23UA 2638	5h 23m	71%	62%
Delta Details →	SDF 17:26 → DTW 18:58DL 4947 · flown by Endeavor	1h 27m Detroit	DTW 20:25 → IAH 22:24DL 1633	5h 58m	73%	57%
American Details →	SDF 19:50 → DFW 21:12AA 2519	1h 35m Dallas-Fort Worth	DFW 22:47 → IAH 23:58AA 1914	5h 08m	63%	26%

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

DEN · 1h 08m · leaves 08:00 4%

ATL · 1h 06m · leaves 10:00 6%

IAD · 1h 05m · leaves 06:00 7%

Afternoon and evening

CLT · 1h 17m · leaves 15:39 21%

ORD · 53m · leaves 19:13 23%

DEN · 54m · leaves 15:25 24%

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 4679 SDF 06:40 → MCO United UA 1493 MCO 11:57 → IAH Connection details →	3h 17m	7h 49m	100%	95%
Delta DL 1610 SDF 07:05 → ATL United UA 425 ATL 11:37 → IAH Connection details →	3h 03m	6h 42m	97%	85%
American AA 4750 SDF 07:37 → PHL United UA 2038 PHL 13:04 → IAH Connection details →	3h 26m	8h 58m	98%	84%

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