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 1 time in 10 at 6 am and 1 time in 4 at 4 pm.

Nonstops


United	IAH	SDF	2h 25m	84%	1.0%	1,071	Flying now
American	IAH	SDF	–	100%few flights	0.0%	1	Not 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 (Louisville is 1 h ahead of Houston). Layovers up to 4 hours. Pick a connection for the details.


United Details →	IAH 05:15 → DEN 06:47UA 1874	2h 58m Denver	DEN 09:45 → SDF 14:28UA 1479	8h 13m	99%	88%
American Details →	IAH 05:02 → DFW 06:19AA 2551	3h 12m Dallas-Fort Worth	DFW 09:31 → SDF 12:48AA 3791 · flown by Envoy	6h 46m	96%	86%
Delta Details →	IAH 05:40 → ATL 08:43DL 1069	1h 47m Atlanta	ATL 10:30 → SDF 11:53DL 1481	5h 13m	98%	83%
American Details →	IAH 07:00 → DFW 08:31AA 3002	3h 36m Dallas-Fort Worth	DFW 12:07 → SDF 15:22AA 3758 · flown by Envoy	7h 22m	98%	82%
Delta Details →	IAH 12:13 → ATL 15:23DL 1682	2h 36m Atlanta	ATL 17:59 → SDF 19:24DL 2831	6h 11m	97%	80%
Delta Details →	IAH 16:51 → ATL 20:13DL 2890	2h 49m Atlanta	ATL 23:02 → SDF 00:26 +1DL 2624	6h 37m	95%	79%
United Details →	IAH 07:20 → IAD 11:28UA 1549	1h 20m Dulles	IAD 12:48 → SDF 14:37UA 3980 · flown by Mesa	6h 17m	97%	78%
United Details →	IAH 05:04 → ORD 07:59UA 1044	3h 01m Chicago	ORD 11:00 → SDF 13:35UA 5467 · flown by SkyWest	7h 31m	100%	77%
Tight connection: often missed
United Details →	IAH 07:20 → DEN 08:52UA 1575	53m Denver	DEN 09:45 → SDF 14:28UA 1479	6h 08m	74%	65%
United Details →	IAH 12:13 → IAD 16:30UA 2366	55m Dulles	IAD 17:25 → SDF 19:18UA 3538 · flown by Republic	6h 05m	74%	54%
United Details →	IAH 14:49 → EWR 19:35UA 2608	50m Newark	EWR 20:25 → SDF 22:50UA 3512 · flown by Republic	7h 01m	48%	23%

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

IAD · 1h 20m · leaves 07:20 3%

DCA · 1h 01m · leaves 06:43 6%

DFW · 1h 06m · leaves 05:02 9%

Afternoon and evening

ORD · 1h 11m · leaves 13:41 24%

IAD · 55m · leaves 12:13 26%

EWR · 50m · leaves 14:49 52%

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 358 IAH 07:23 → DFW American AA 3758 DFW 12:07 → SDF Connection details →	3h 17m	6h 59m	98%	83%
United UA 604 IAH 07:40 → BWI Southwest WN 4885 BWI 14:40 → SDF Connection details →	2h 53m	7h 45m	100%	80%
United UA 2124 IAH 09:35 → ORD American AA 4668 ORD 16:02 → SDF Connection details →	3h 33m	8h 03m	99%	80%

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