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 MDT → IAD flights land within a few points of 85% on time whatever the hour.

Nonstops


United	MDT	IAD	58m	85%	1.7%	1,107	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


United Details →	MDT 06:30 → ORD 07:42UA 2684	3h 25m Chicago	ORD 11:07 → IAD 14:12UA 1869	7h 42m	98%	85%
Delta Details →	MDT 06:15 → DTW 07:52DL 4787 · flown by Endeavor	58m Detroit	DTW 08:50 → IAD 10:23DL 2884	4h 10m	96%	84%
Delta Details →	MDT 06:04 → ATL 08:05DL 1255	1h 45m Atlanta	ATL 09:50 → IAD 11:39DL 1444	5h 34m	97%	79%
American Details →	MDT 06:31 → CLT 08:20AA 5833 · flown by Piedmont	2h 45m Charlotte	CLT 11:05 → IAD 12:38AA 5220 · flown by PSA	6h 07m	97%	79%
Delta Details →	MDT 14:00 → ATL 16:08DL 4717 · flown by Endeavor	3h 07m Atlanta	ATL 19:15 → IAD 21:03DL 1309	7h 04m	100%	74%
United Details →	MDT 10:40 → ORD 11:56UA 4185 · flown by GoJet	1h 34m Chicago	ORD 13:30 → IAD 16:30UA 2794	5h 50m	97%	74%
Delta Details →	MDT 18:22 → ATL 20:34DL 2857	2h 19m Atlanta	ATL 22:53 → IAD 00:44 +1DL 2549	6h 22m	97%	70%
Delta Details →	MDT 12:22 → DTW 14:01DL 4065 · flown by SkyWest	1h 09m Detroit	DTW 15:10 → IAD 16:42DL 1787	4h 20m	81%	68%
Tight connection: often missed
American Details →	MDT 17:43 → CLT 19:29AA 5275 · flown by PSA	1h 02m Charlotte	CLT 20:31 → IAD 22:05AA 5549 · flown by PSA	4h 22m	63%	33%
American Details →	MDT 15:30 → CLT 17:18AA 5832 · flown by Piedmont	52m Charlotte	CLT 18:10 → IAD 19:34AA 1450	4h 10m	55%	28%

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

DTW · 58m · leaves 06:15 4%

CLT · 57m · leaves 08:24 14%

ORD · 58m · leaves 06:30 17%

Afternoon and evening

CLT · 46m · leaves 15:30 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 United UA 3500 DTW 10:13 → IAD Connection details →	2h 21m	5h 35m	96%	88%
American AA 6100 MDT 05:00 → CLT United UA 4012 CLT 10:27 → IAD Connection details →	3h 43m	6h 55m	99%	83%
American AA 6117 MDT 10:15 → PHL United UA 3593 PHL 15:10 → IAD Connection details →	3h 56m	6h 03m	100%	81%

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