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 80-minute layover misses 1 time in 10 at 8 am and 29% of the time at 7 pm.

Nonstops


Frontier	GRR	DEN	3h 00m	80%	0.0%	147	Flying now
United	GRR	DEN	3h 01m	79%	0.4%	728	Flying now
Southwest	GRR	DEN	2h 55m	76%	0.3%	359	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Denver on time. Total trip = scheduled departure to arrival, layover included (Denver is 2 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	2h 23m Chicago	ORD 08:40 → DEN 10:31UA 526	6h 31m	100%	90%
United Details →	GRR 17:07 → IAH 19:10UA 4036 · flown by Mesa	3h 00m Houston	IAH 22:10 → DEN 23:57UA 1066	8h 50m	99%	88%
United Details →	GRR 07:15 → ORD 07:28UA 2137	3h 26m Chicago	ORD 10:54 → DEN 12:45UA 581	7h 30m	96%	88%
Delta Details →	GRR 07:53 → ATL 09:56DL 2161	2h 54m Atlanta	ATL 12:50 → DEN 14:04DL 957	8h 11m	97%	86%
Delta Details →	GRR 06:10 → ATL 08:14DL 2453	3h 31m Atlanta	ATL 11:45 → DEN 12:59DL 706	8h 49m	99%	85%
Delta Details →	GRR 08:15 → DTW 09:19DL 3885 · flown by SkyWest	3h 23m Detroit	DTW 12:42 → DEN 13:54DL 1648	7h 39m	100%	84%
Southwest Details →	GRR 05:30 → BWI 07:10WN 1926	2h 30m Baltimore	BWI 09:40 → DEN 11:25WN 275	7h 55m	97%	81%
Delta Details →	GRR 05:30 → DTW 06:30DL 4885 · flown by Endeavor	2h 10m Detroit	DTW 08:40 → DEN 09:53DL 1113	6h 23m	95%	81%
Tight connection: often missed
United Details →	GRR 11:38 → ORD 11:58UA 4583 · flown by GoJet	58m Chicago	ORD 12:56 → DEN 14:46UA 1150	5h 08m	72%	61%
United Details →	GRR 18:25 → ORD 18:48UA 5516 · flown by SkyWest	1h 12m Chicago	ORD 20:00 → DEN 22:01UA 767	5h 36m	60%	40%
American Details →	GRR 17:24 → DFW 19:14AA 310	1h 15m Dallas-Fort Worth	DFW 20:29 → DEN 21:32AA 577	6h 08m	71%	33%

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 13m · leaves 10:10 11%

PHL · 51m · leaves 06:44 14%

DTW · 1h 07m · leaves 10:34 17%

Afternoon and evening

IAH · 1h 12m · leaves 17:07 23%

DFW · 1h 15m · leaves 17:24 29%

ORD · 1h 12m · leaves 18:25 40%

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 1327 ATL 11:10 → DEN Connection details →	2h 56m	8h 18m	98%	88%
Delta DL 3885 GRR 08:15 → DTW Frontier F9 3565 DTW 13:19 → DEN Connection details →	4h 00m	8h 20m	100%	85%
Delta DL 5806 GRR 06:00 → LGA United UA 716 LGA 10:00 → DEN Connection details →	1h 56m	8h 20m	97%	85%

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