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 OKC → IAH flights land within a few points of 86% on time whatever the hour.

Nonstops


United	OKC	IAH	1h 38m	86%	0.8%	2,604	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. Layovers up to 4 hours. Pick a connection for the details.


Delta Details →	OKC 07:00 → ATL 10:10DL 1158	2h 20m Atlanta	ATL 12:30 → IAH 13:38DL 1572	6h 38m	97%	81%
United Details →	OKC 08:45 → ORD 11:11UA 5823 · flown by SkyWest	1h 29m Chicago	ORD 12:40 → IAH 15:40UA 1448	6h 55m	90%	78%
Delta Details →	OKC 05:49 → ATL 08:59DL 1184	1h 06m Atlanta	ATL 10:05 → IAH 11:18DL 1682	5h 29m	94%	74%
United Details →	OKC 09:15 → DEN 10:01UA 1424	1h 33m Denver	DEN 11:34 → IAH 15:09UA 1599	5h 54m	97%	73%
Delta Details →	OKC 17:07 → ATL 20:29DL 2862	2h 15m Atlanta	ATL 22:44 → IAH 23:56DL 1601	6h 49m	96%	69%
Delta Details →	OKC 07:15 → MSP 09:29DL 3844 · flown by SkyWest	55m Minneapolis	MSP 10:24 → IAH 13:15DL 2673	6h 02m	87%	68%
American Details →	OKC 11:10 → DFW 12:18AA 3805 · flown by Envoy	2h 15m Dallas-Fort Worth	DFW 14:33 → IAH 15:48AA 3583 · flown by Envoy	4h 38m	97%	67%
American Details →	OKC 05:01 → DFW 06:07AA 656	1h 13m Dallas-Fort Worth	DFW 07:20 → IAH 08:32AA 3193	3h 31m	94%	67%
Tight connection: often missed
United Details →	OKC 07:10 → ORD 09:37UA 5364 · flown by SkyWest	48m Chicago	ORD 10:25 → IAH 13:23UA 2638	6h 13m	75%	63%
United Details →	OKC 18:46 → DEN 20:08UA 5582 · flown by SkyWest	1h 02m Denver	DEN 21:10 → IAH 00:41 +1UA 1253	5h 55m	72%	46%
American Details →	OKC 16:38 → DFW 17:49AA 3730 · flown by Envoy	47m Dallas-Fort Worth	DFW 18:36 → IAH 19:54AA 1392	3h 16m	56%	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

DFW · 1h 13m · leaves 05:01 6%

ATL · 1h 06m · leaves 05:49 6%

MSP · 55m · leaves 07:15 13%

Afternoon and evening

CLT · 1h 13m · leaves 13:43 17%

DEN · 1h 02m · leaves 18:46 28%

DFW · 47m · leaves 16:38 44%

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.


Delta DL 1184 OKC 05:49 → ATL United UA 425 ATL 11:37 → IAH Connection details →	2h 38m	6h 58m	97%	84%
Southwest WN 295 OKC 10:25 → AUS United UA 334 AUS 14:18 → IAH Connection details →	2h 38m	4h 59m	100%	83%
Southwest WN 3107 OKC 07:32 → BNA United UA 1366 BNA 11:10 → IAH Connection details →	1h 52m	5h 51m	98%	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