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


United	PIT	DEN	3h 39m	87%	0.7%	851	Flying now
Southwest	PIT	DEN	3h 30m	77%	0.8%	767	Flying now
Frontier	PIT	DEN	3h 36m	83%	0.0%	41	Not flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Denver on time. Total trip = scheduled departure to arrival, layover included (Denver is 2 h behind Pittsburgh). Layovers up to 4 hours. Pick a connection for the details.


United Details →	PIT 06:06 → IAD 07:18UA 3679 · flown by Republic	2h 55m Dulles	IAD 10:13 → DEN 12:05UA 1865	7h 59m	100%	92%
Southwest Details →	PIT 05:10 → MCO 07:30WN 3374	2h 15m Orlando	MCO 09:45 → DEN 11:35WN 2630	8h 25m	100%	92%
United Details →	PIT 07:00 → ORD 07:48UA 2218	3h 06m Chicago	ORD 10:54 → DEN 12:45UA 581	7h 45m	97%	91%
United Details →	PIT 17:02 → IAH 19:05UA 1444	3h 05m Houston	IAH 22:10 → DEN 23:57UA 1066	8h 55m	98%	88%
Southwest Details →	PIT 06:45 → STL 07:30WN 3386	1h 12m St Louis	STL 08:42 → DEN 10:02WN 3910	5h 17m	97%	87%
American Details →	PIT 05:03 → CLT 06:35AA 349	1h 04m Charlotte	CLT 07:39 → DEN 09:10AA 1754	6h 07m	96%	86%
United Details →	PIT 08:36 → ORD 09:30UA 3461 · flown by Republic	3h 26m Chicago	ORD 12:56 → DEN 14:46UA 1150	8h 10m	99%	86%
United Details →	PIT 10:30 → IAD 11:42UA 6184 · flown by Mesa	1h 06m Dulles	IAD 12:48 → DEN 14:42UA 1587	6h 12m	94%	85%
Tight connection: often missed
Delta Details →	PIT 16:20 → MSP 17:40DL 5249 · flown by Endeavor	1h 05m Minneapolis	MSP 18:45 → DEN 19:56DL 2931	5h 41m	69%	45%
United Details →	PIT 17:23 → SFO 19:51UA 436	1h 09m San Francisco	SFO 21:00 → DEN 00:47 +1UA 301	9h 24m	51%	44%
Delta Details →	PIT 17:04 → JFK 18:55DL 5085 · flown by Endeavor	55m New York	JFK 19:50 → DEN 22:45DL 424	7h 41m	47%	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

BWI · 1h 10m · leaves 10:30 2%

IAH · 1h 14m · leaves 06:15 2%

STL · 1h 12m · leaves 06:45 3%

Afternoon and evening

MCO · 55m · leaves 17:38 40%

SFO · 1h 09m · leaves 17:23 49%

JFK · 55m · leaves 17:04 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.


American AA 4427 PIT 06:23 → ORD United UA 581 ORD 10:54 → DEN Connection details →	3h 33m	8h 22m	99%	96%
Southwest WN 1935 PIT 06:30 → BNA United UA 502 BNA 10:26 → DEN Connection details →	3h 21m	7h 53m	98%	90%
Delta DL 5753 PIT 06:05 → LGA United UA 716 LGA 10:00 → DEN Connection details →	2h 26m	8h 15m	98%	89%

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