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 PIT → IAD flights land within a few points of 9 in 10 on time whatever the hour.

Nonstops


United	PIT	IAD	1h 12m	89%	1.3%	1,455	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 →	PIT 06:49 → ORD 07:37UA 1803	3h 30m Chicago	ORD 11:07 → IAD 14:12UA 1869	7h 23m	97%	85%
Delta Details →	PIT 10:25 → DTW 11:38DL 5607 · flown by Republic	3h 32m Detroit	DTW 15:10 → IAD 16:42DL 1787	6h 17m	98%	82%
Delta Details →	PIT 05:45 → ATL 07:25DL 1504	2h 25m Atlanta	ATL 09:50 → IAD 11:39DL 1444	5h 53m	99%	82%
Delta Details →	PIT 07:00 → ATL 08:49DL 1383	3h 28m Atlanta	ATL 12:17 → IAD 14:02DL 2135	7h 02m	99%	81%
American Details →	PIT 06:38 → CLT 08:10AA 384	2h 55m Charlotte	CLT 11:05 → IAD 12:38AA 5220 · flown by PSA	6h 00m	99%	79%
Delta Details →	PIT 07:22 → JFK 09:00DL 5677 · flown by Republic	1h 16m New York	JFK 10:16 → IAD 11:48DL 5835 · flown by Republic	4h 26m	94%	76%
United Details →	PIT 08:36 → ORD 09:30UA 3461 · flown by Republic	4h 00m Chicago	ORD 13:30 → IAD 16:30UA 2794	7h 54m	99%	75%
Delta Details →	PIT 06:30 → DTW 07:44DL 5319 · flown by Endeavor	1h 06m Detroit	DTW 08:50 → IAD 10:23DL 2884	3h 55m	88%	74%
Tight connection: often missed
United Details →	PIT 14:10 → ORD 14:55UA 2180	58m Chicago	ORD 15:53 → IAD 19:02UA 2437	4h 52m	73%	50%
American Details →	PIT 15:36 → CLT 17:15AA 2309	55m Charlotte	CLT 18:10 → IAD 19:34AA 1450	4h 04m	67%	33%
American Details →	PIT 20:01 → CLT 21:50AA 5602 · flown by PSA	55m Charlotte	CLT 22:45 → IAD 00:10 +1AA 1242	4h 09m	61%	22%

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

EWR · 1h 07m · leaves 07:25 3%

ATL · 1h 01m · leaves 07:00 6%

JFK · 1h 16m · leaves 07:22 6%

Afternoon and evening

IAH · 1h 15m · leaves 17:02 20%

ORD · 1h 11m · leaves 16:10 24%

CLT · 55m · leaves 20:01 39%

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.


Southwest WN 3374 PIT 05:10 → MCO United UA 1893 MCO 09:37 → IAD Connection details →	2h 07m	6h 45m	98%	90%
American AA 4427 PIT 06:23 → ORD United UA 1869 ORD 11:07 → IAD Connection details →	3h 46m	7h 49m	99%	88%
Southwest WN 591 PIT 07:00 → FLL United UA 1421 FLL 12:13 → IAD Connection details →	2h 38m	7h 49m	94%	84%

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