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

No clear winner: United’s IAH → SAT flights land within a few points of 83% on time whatever the hour.

Nonstops


United	IAH	SAT	1h 08m	83%	0.6%	2,893	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


United Details →	IAH 05:15 → DEN 06:47UA 1874	2h 48m Denver	DEN 09:35 → SAT 12:43UA 2625	7h 28m	99%	91%
United Details →	IAH 09:32 → DEN 11:08UA 1450	2h 36m Denver	DEN 13:44 → SAT 16:55UA 1022	7h 23m	96%	87%
United Details →	IAH 05:04 → ORD 07:59UA 1044	1h 26m Chicago	ORD 09:25 → SAT 12:29UA 490	7h 25m	99%	85%
Delta Details →	IAH 07:02 → ATL 10:05DL 1315	2h 10m Atlanta	ATL 12:15 → SAT 13:38DL 1408	6h 39m	96%	79%
American Details →	IAH 09:27 → DFW 10:51AA 3193	3h 54m Dallas-Fort Worth	DFW 14:45 → SAT 15:55AA 3777 · flown by Envoy	6h 28m	98%	79%
Delta Details →	IAH 08:05 → ATL 11:09DL 644	2h 36m Atlanta	ATL 13:45 → SAT 15:14DL 2009	7h 09m	100%	78%
American Details →	IAH 07:00 → DFW 08:31AA 3002	3h 30m Dallas-Fort Worth	DFW 12:01 → SAT 13:11AA 4084 · flown by Envoy	6h 11m	98%	74%
American Details →	IAH 05:02 → DFW 06:19AA 2551	1h 19m Dallas-Fort Worth	DFW 07:38 → SAT 08:46AA 1836	3h 44m	92%	73%
Tight connection: often missed
Delta Details →	IAH 09:42 → ATL 12:48DL 1585	57m Atlanta	ATL 13:45 → SAT 15:14DL 2009	5h 32m	75%	57%
Frontier Details →	IAH 13:17 → LAS 14:29F9 4131	55m Las Vegas	LAS 15:24 → SAT 20:14F9 3418	6h 58m	69%	56%
American Details →	IAH 15:06 → CLT 18:51AA 1919	1h 28m Charlotte	CLT 20:19 → SAT 22:16AA 2441	7h 10m	72%	44%

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

ATL · 59m · leaves 05:40 8%

DFW · 1h 19m · leaves 05:02 8%

ORD · 53m · leaves 06:13 14%

Afternoon and evening

MSP · 1h 09m · leaves 14:35 28%

DTW · 55m · leaves 15:27 42%

DFW · 1h 07m · leaves 14:04 46%

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 1874 IAH 05:15 → DEN Southwest WN 3149 DEN 09:20 → SAT Connection details →	2h 33m	7h 10m	97%	78%
United UA 2074 IAH 09:31 → DFW American AA 3777 DFW 14:45 → SAT Connection details →	3h 48m	6h 24m	97%	78%
Frontier F9 1404 IAH 06:10 → ATL Delta DL 1408 ATL 12:15 → SAT Connection details →	2h 34m	7h 31m	93%	76%

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