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

No clear winner: airlines and hours on this route all land within a few points of 82% on time.

Nonstops (seasonal or thin)


American	GRR	PHL	1h 57m	83%	2.8%	543	Flying now
Allegiant	GRR	PHL	1h 51m	67%few flights	0.0%	21	Flying now

Best connections, any airlines

Most reliable Quickest (80%+ on time)

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


Southwest Details →	GRR 06:30 → MDW 06:40WN 1894	2h 20m Chicago	MDW 09:00 → PHL 11:55WN 4901	5h 25m	100%	96%
Delta + Americantwo ticketsDetails →	GRR 07:53 → ATL 09:56DL 2161	2h 29m Atlanta	ATL 12:25 → PHL 14:36AA 4338 · flown by Republic	6h 43m	94%	88%
Delta Details →	GRR 06:10 → ATL 08:14DL 2453	3h 07m Atlanta	ATL 11:21 → PHL 13:24DL 2279	7h 16m	99%	83%
Delta Details →	GRR 05:30 → DTW 06:30DL 4885 · flown by Endeavor	3h 40m Detroit	DTW 10:10 → PHL 11:46DL 2331	6h 19m	96%	82%
United Details →	GRR 06:00 → ORD 06:17UA 4458 · flown by GoJet	58m Chicago	ORD 07:15 → PHL 10:30UA 2038	4h 30m	92%	82%
Delta + Americantwo ticketsDetails →	GRR 08:15 → DTW 09:19DL 3885 · flown by SkyWest	3h 39m Detroit	DTW 12:58 → PHL 14:40AA 5530 · flown by PSA	6h 24m	100%	80%
American Details →	GRR 06:01 → CLT 07:57AA 3230	3h 03m Charlotte	CLT 11:00 → PHL 12:43AA 2498	6h 42m	97%	76%
American Details →	GRR 06:00 → ORD 06:07AA 2502	2h 22m Chicago	ORD 08:29 → PHL 11:41AA 471	5h 41m	93%	74%
Tight connection: often missed
American Details →	GRR 07:01 → DFW 08:48AA 1561	50m Dallas-Fort Worth	DFW 09:38 → PHL 14:00AA 402	6h 59m	67%	47%
American Details →	GRR 17:28 → ORD 17:52AA 3715 · flown by Envoy	56m Chicago	ORD 18:48 → PHL 21:59AA 2443	4h 38m	68%	35%
American Details →	GRR 19:54 → ORD 20:37AA 4729 · flown by Republic	1h 05m Chicago	ORD 21:42 → PHL 00:55 +1AA 490	5h 02m	69%	30%

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

MDW · 1h 00m · leaves 06:30 0%

ORD · 1h 08m · leaves 10:10 11%

DTW · 51m · leaves 08:15 14%

Afternoon and evening

ORD · 56m · leaves 17:28 32%

DFW · 1h 05m · leaves 17:24 36%

DCA · 1h 19m · leaves 14:03 53%

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.

The table above includes two-ticket connections (marked “two tickets”), held to the 90-minute minimum. One ticket only →

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