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 77% on time.

Nonstops


American	MDT	ORD	2h 19m	78%	3.1%	1,146	Flying now
United	MDT	ORD	2h 16m	75%	2.8%	1,488	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Chicago on time. Total trip = scheduled departure to arrival, layover included (Chicago is 1 h behind Harrisburg). Layovers up to 4 hours. Pick a connection for the details.


American Details →	MDT 07:00 → BOS 08:31AA 4714 · flown by Republic	1h 58m Boston	BOS 10:29 → ORD 12:30AA 3022	6h 29m	99%	89%
United Details →	MDT 06:15 → IAD 07:13UA 4244 · flown by CommuteAir	3h 18m Dulles	IAD 10:31 → ORD 11:53UA 1252	6h 38m	98%	88%
Delta Details →	MDT 06:15 → DTW 07:52DL 4787 · flown by Endeavor	2h 23m Detroit	DTW 10:15 → ORD 10:50DL 3673 · flown by SkyWest	5h 35m	98%	86%
American Details →	MDT 06:31 → CLT 08:20AA 5833 · flown by Piedmont	2h 41m Charlotte	CLT 11:01 → ORD 12:19AA 2908	6h 48m	97%	86%
American Details →	MDT 06:45 → PHL 07:40AA 6013 · flown by Piedmont	2h 55m Philadelphia	PHL 10:35 → ORD 12:09AA 1041	6h 24m	98%	81%
American Details →	MDT 05:00 → CLT 06:44AA 6100 · flown by Piedmont	2h 58m Charlotte	CLT 09:42 → ORD 11:00AA 1038	7h 00m	99%	78%
American Details →	MDT 10:15 → PHL 11:14AA 6117 · flown by Piedmont	1h 28m Philadelphia	PHL 12:42 → ORD 14:15AA 2925	5h 00m	100%	76%
United Details →	MDT 10:30 → IAD 11:28UA 4974 · flown by CommuteAir	1h 47m Dulles	IAD 13:15 → ORD 14:29UA 2331	4h 59m	93%	74%
Tight connection: often missed
American Details →	MDT 17:43 → CLT 19:29AA 5275 · flown by PSA	58m Charlotte	CLT 20:27 → ORD 22:00AA 627	5h 17m	60%	35%
American Details →	MDT 19:38 → PHL 20:39AA 5965 · flown by Piedmont	53m Philadelphia	PHL 21:32 → ORD 23:30AA 3042	4h 52m	61%	31%
Delta Details →	MDT 17:34 → DTW 19:14DL 4891 · flown by Endeavor	46m Detroit	DTW 20:00 → ORD 20:31DL 1665	3h 57m	49%	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

ATL · 57m · leaves 06:04 10%

CLT · 1h 02m · leaves 05:00 10%

PHL · 1h 20m · leaves 08:15 12%

Afternoon and evening

PHL · 53m · leaves 19:38 39%

CLT · 58m · leaves 17:43 40%

DTW · 46m · leaves 17:34 51%

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 4787 MDT 06:15 → DTW American AA 4103 DTW 10:33 → ORD Connection details →	2h 41m	5h 53m	98%	91%
American AA 4714 MDT 07:00 → BOS United UA 503 BOS 10:35 → ORD Connection details →	2h 04m	6h 28m	98%	83%
American AA 5833 MDT 06:31 → CLT United UA 4680 CLT 10:35 → ORD Connection details →	2h 15m	6h 28m	94%	79%

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