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 ACV → DEN flights land within a few points of 77% on time whatever the hour.

Nonstops (seasonal or thin)


United	ACV	DEN	2h 52m	77%	1.4%	370	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 (Denver is 1 h ahead of Arcata/Eureka). Layovers up to 4 hours. Pick a connection for the details.


United Details →	ACV 15:47 → LAX 17:51UA 5506 · flown by SkyWest	1h 54m Los Angeles	LAX 19:45 → DEN 23:15UA 2829	6h 28m	93%	85%
United Details →	ACV 07:15 → LAX 09:19UA 4756 · flown by SkyWest	1h 36m Los Angeles	LAX 10:55 → DEN 14:27UA 2061	6h 12m	100%	85%
United Details →	ACV 14:05 → SFO 15:22UA 4655 · flown by SkyWest	3h 34m San Francisco	SFO 18:56 → DEN 22:44UA 2436	7h 39m	96%	84%
Alaska + Unitedtwo ticketsDetails →	ACV 14:50 → SEA 16:30AS 3345 · flown by SkyWest	3h 24m Seattle	SEA 19:54 → DEN 23:38UA 1218	7h 48m	94%	73%
United Details →	ACV 06:00 → SFO 07:09UA 5313 · flown by SkyWest	1h 22m San Francisco	SFO 08:31 → DEN 12:22UA 2348	5h 22m	86%	70%
United Details →	ACV 07:40 → SFO 08:56UA 4632 · flown by SkyWest	3h 47m San Francisco	SFO 12:43 → DEN 16:35UA 540	7h 55m	92%	66%
United + Frontiertwo ticketsDetails →	ACV 18:44 → SFO 20:07UA 5305 · flown by SkyWest	1h 32m San Francisco	SFO 21:39 → DEN 01:34 +1F9 3440	5h 46m	16%	9%
Tight connection: often missed
United Details →	ACV 07:40 → SFO 08:56UA 4632 · flown by SkyWest	1h 44m San Francisco	SFO 10:40 → DEN 14:23UA 1604	5h 43m	69%	44%
United Details →	ACV 14:05 → SFO 15:22UA 4655 · flown by SkyWest	48m San Francisco	SFO 16:10 → DEN 20:01UA 1430	4h 56m	45%	35%
United Details →	ACV 18:44 → SFO 20:07UA 5305 · flown by SkyWest	53m San Francisco	SFO 21:00 → DEN 00:47 +1UA 301	5h 03m	23%	18%

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.

Afternoon and evening

SFO · 53m · leaves 18:44 77%

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.

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