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 GRR → IAH flights land within a few points of 4 in 5 on time whatever the hour.

Nonstops (seasonal or thin)


United	GRR	IAH	3h 06m	79%	0.8%	366	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 Grand Rapids). Layovers up to 4 hours. Pick a connection for the details.


United Details →	GRR 06:00 → ORD 06:17UA 4458 · flown by GoJet	1h 18m Chicago	ORD 07:35 → IAH 10:36UA 1231	5h 36m	96%	86%
Delta Details →	GRR 07:53 → ATL 09:56DL 2161	2h 34m Atlanta	ATL 12:30 → IAH 13:38DL 1572	6h 45m	95%	81%
Delta Details →	GRR 06:10 → ATL 08:14DL 2453	1h 51m Atlanta	ATL 10:05 → IAH 11:18DL 1682	6h 08m	98%	79%
Delta Details →	GRR 05:30 → DTW 06:30DL 4885 · flown by Endeavor	2h 10m Detroit	DTW 08:40 → IAH 10:36DL 1043	6h 06m	95%	78%
United Details →	GRR 05:15 → ORD 05:33UA 5615 · flown by SkyWest	56m Chicago	ORD 06:29 → IAH 09:18UA 1799	5h 03m	87%	77%
American Details →	GRR 10:10 → ORD 10:32AA 6391 · flown by SkyWest	2h 57m Chicago	ORD 13:29 → IAH 16:27AA 4426 · flown by Republic	7h 15m	97%	76%
Delta Details →	GRR 07:00 → MSP 07:33DL 2913	2h 51m Minneapolis	MSP 10:24 → IAH 13:15DL 2673	7h 17m	98%	76%
United Details →	GRR 15:37 → DEN 16:30UA 2745	3h 58m Denver	DEN 20:28 → IAH 23:59UA 2419	9h 22m	95%	75%
Tight connection: often missed
American Details →	GRR 17:34 → CLT 19:39AA 1891	1h 06m Charlotte	CLT 20:45 → IAH 22:27AA 1840	5h 53m	67%	45%
United Details →	GRR 15:37 → DEN 16:30UA 2745	48m Denver	DEN 17:18 → IAH 20:55UA 1585	6h 18m	61%	45%
American Details →	GRR 07:01 → DFW 08:48AA 1561	47m Dallas-Fort Worth	DFW 09:35 → IAH 10:53AA 3591 · flown by Envoy	4h 52m	63%	42%

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

ORD · 1h 17m · leaves 06:00 5%

DEN · 1h 13m · leaves 08:00 18%

DTW · 55m · leaves 10:34 22%

Afternoon and evening

CLT · 1h 06m · leaves 17:34 33%

ORD · 1h 14m · leaves 18:25 38%

DEN · 48m · leaves 15:37 39%

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 2453 GRR 06:10 → ATL United UA 425 ATL 11:37 → IAH Connection details →	3h 23m	7h 37m	99%	87%
American AA 3230 GRR 06:01 → CLT United UA 6236 CLT 11:48 → IAH Connection details →	3h 51m	8h 33m	97%	87%
American AA 5301 GRR 06:00 → DCA United UA 2190 DCA 10:58 → IAH Connection details →	3h 10m	8h 19m	97%	78%

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