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

Nonstops (seasonal or thin)


United	SUN	DEN	2h 00m	85%	0.0%	630	Flying now

Best connections, any airlines

Most reliable Quickest (80%+ on time)

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


United Details →	SUN 13:57 → LAX 15:31UA 6008 · flown by SkyWest	3h 14m Los Angeles	LAX 18:45 → DEN 22:15UA 2610	8h 18m	99%	90%
Delta + Unitedtwo ticketsDetails →	SUN 07:20 → SLC 08:25DL 4037 · flown by SkyWest	2h 14m Salt Lake City	SLC 10:39 → DEN 12:24UA 2004	5h 04m	99%	88%
United Details →	SUN 08:00 → LAX 09:34UA 6053 · flown by SkyWest	1h 21m Los Angeles	LAX 10:55 → DEN 14:27UA 2061	6h 27m	92%	84%
United Details →	SUN 08:15 → ORD 12:48UA 4788 · flown by SkyWest	1h 45m Chicago	ORD 14:33 → DEN 16:31UA 2803	8h 16m	98%	72%
Alaska Details →	SUN 10:20 → SEA 11:14AS 2325 · flown by Horizon	2h 19m Seattle	SEA 13:33 → DEN 17:20AS 242	7h 00m	100%	70%
Delta + Unitedtwo ticketsDetails →	SUN 13:10 → SLC 14:24DL 4019 · flown by SkyWest	3h 33m Salt Lake City	SLC 17:57 → DEN 19:40UA 1910	6h 30m	98%	68%
Delta Details →	SUN 15:15 → SLC 16:24DL 3690 · flown by SkyWest	2h 06m Salt Lake City	SLC 18:30 → DEN 20:02DL 1586	4h 49m	96%	68%
United + Frontiertwo ticketsDetails →	SUN 07:40 → SFO 08:59UA 5423 · flown by SkyWest	3h 39m San Francisco	SFO 12:38 → DEN 16:25F9 1094	8h 45m	95%	41%
Tight connection: often missed
United Details →	SUN 07:40 → SFO 08:59UA 5423 · flown by SkyWest	1h 41m San Francisco	SFO 10:40 → DEN 14:23UA 1604	6h 43m	75%	51%

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.

The table above includes two-ticket connections (marked “two tickets”), held to the 90-minute minimum. One ticket only →

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