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 PHL → IAD flights land within a few points of 84% on time whatever the hour.

Nonstops


United	PHL	IAD	1h 10m	84%	2.9%	1,104	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 →	PHL 06:00 → ORD 07:30UA 660	3h 37m Chicago	ORD 11:07 → IAD 14:12UA 1869	8h 12m	100%	84%
Delta Details →	PHL 06:25 → ATL 08:32DL 1152	3h 45m Atlanta	ATL 12:17 → IAD 14:02DL 2135	7h 37m	99%	82%
Delta Details →	PHL 05:15 → ATL 07:22DL 1269	2h 28m Atlanta	ATL 09:50 → IAD 11:39DL 1444	6h 23m	98%	81%
Delta Details →	PHL 09:46 → DTW 11:31DL 2968	3h 39m Detroit	DTW 15:10 → IAD 16:42DL 1787	6h 56m	100%	80%
Delta Details →	PHL 06:10 → DTW 07:50DL 1540	1h 00m Detroit	DTW 08:50 → IAD 10:23DL 2884	4h 15m	91%	80%
American Details →	PHL 06:00 → CLT 07:53AA 3139	3h 12m Charlotte	CLT 11:05 → IAD 12:38AA 5220 · flown by PSA	6h 38m	99%	79%
Delta Details →	PHL 10:40 → ATL 12:54DL 1100	2h 05m Atlanta	ATL 14:59 → IAD 16:47DL 1695	6h 07m	99%	73%
Delta Details →	PHL 14:32 → ATL 16:37DL 2279	2h 38m Atlanta	ATL 19:15 → IAD 21:03DL 1309	6h 32m	97%	71%
Tight connection: often missed
United Details →	PHL 13:31 → ORD 14:55UA 2784	58m Chicago	ORD 15:53 → IAD 19:02UA 2437	5h 31m	74%	50%
American Details →	PHL 11:02 → DFW 13:38AA 417	56m Dallas-Fort Worth	DFW 14:34 → IAD 18:34AA 1904	7h 33m	75%	43%
American Details →	PHL 15:00 → DFW 17:50AA 402	54m Dallas-Fort Worth	DFW 18:44 → IAD 22:46AA 1132	7h 52m	64%	29%

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 10m · leaves 06:00 4%

ATL · 1h 18m · leaves 06:25 6%

DTW · 1h 00m · leaves 06:10 9%

Afternoon and evening

CLT · 1h 07m · leaves 19:35 27%

ATL · 50m · leaves 16:08 36%

DFW · 54m · leaves 15:00 36%

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 1540 PHL 06:10 → DTW United UA 3500 DTW 10:13 → IAD Connection details →	2h 23m	5h 40m	94%	85%
American AA 3139 PHL 06:00 → CLT United UA 4012 CLT 10:27 → IAD Connection details →	2h 34m	5h 55m	99%	83%
American AA 2822 PHL 08:53 → TPA United UA 1576 TPA 14:00 → IAD Connection details →	2h 20m	7h 29m	97%	83%

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