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 DEN → ACV flights land within a few points of 4 in 5 on time whatever the hour.

Nonstops (seasonal or thin)


United	DEN	ACV	3h 04m	80%	0.5%	369	Flying now

Best connections, any airlines

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Arcata/Eureka on time. Total trip = scheduled departure to arrival, layover included (Arcata/Eureka is 1 h behind Denver). Layovers up to 4 hours. Pick a connection for the details.


United Details →	DEN 08:00 → LAX 09:32UA 1638	3h 13m Los Angeles	LAX 12:45 → ACV 14:48UA 5384 · flown by SkyWest	7h 48m	100%	88%
United Details →	DEN 15:43 → LAX 17:15UA 1195	3h 00m Los Angeles	LAX 20:15 → ACV 22:18UA 5441 · flown by SkyWest	7h 35m	99%	83%
United Details →	DEN 15:47 → SFO 17:30UA 2633	3h 52m San Francisco	SFO 21:22 → ACV 22:51UA 5626 · flown by SkyWest	8h 04m	97%	71%
United Details →	DEN 05:15 → SFO 06:53UA 2367	3h 22m San Francisco	SFO 10:15 → ACV 11:42UA 4708 · flown by SkyWest	7h 27m	99%	70%
United Details →	DEN 11:21 → SFO 13:04UA 1561	3h 27m San Francisco	SFO 16:31 → ACV 18:03UA 5480 · flown by SkyWest	7h 42m	99%	69%
United Details →	DEN 17:54 → SFO 19:40UA 1007	2h 55m San Francisco	SFO 22:35 → ACV 23:59UA 4695 · flown by SkyWest	7h 05m	92%	66%
Southwest + Alaskatwo ticketsDetails →	DEN 07:45 → SEA 09:45WN 1713	2h 41m Seattle	SEA 12:26 → ACV 14:13AS 3220 · flown by SkyWest	7h 28m	98%	66%
Tight connection: often missed
United Details →	DEN 07:40 → SFO 09:18UA 2391	57m San Francisco	SFO 10:15 → ACV 11:42UA 4708 · flown by SkyWest	5h 02m	67%	47%
United Details →	DEN 19:34 → SFO 21:20UA 1389	1h 15m San Francisco	SFO 22:35 → ACV 23:59UA 4695 · flown by SkyWest	5h 25m	54%	39%

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

LAX · 1h 11m · leaves 10:02 6%

SFO · 57m · leaves 07:40 33%

Afternoon and evening

SFO · 1h 15m · leaves 19:34 46%

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