Sun, Oct 4 has passed, so this is the 12-month record.

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 → SFO flights land within a few points of 63% on time whatever the hour.

Nonstops (seasonal or thin)


United	SUN	SFO	2h 21m	63%	0.0%	293	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


United Details →	SUN 13:57 → LAX 15:31UA 6008 · flown by SkyWest	1h 39m Los Angeles	LAX 17:10 → SFO 18:38UA 233	5h 41m	98%	81%
United Details →	SUN 07:00 → DEN 08:58UA 5712 · flown by SkyWest	2h 23m Denver	DEN 11:21 → SFO 13:04UA 1561	7h 04m	96%	69%
Alaska Details →	SUN 10:20 → SEA 11:14AS 2325 · flown by Horizon	2h 06m Seattle	SEA 13:20 → SFO 15:31AS 680	6h 11m	100%	68%
Delta Details →	SUN 07:20 → SLC 08:25DL 4037 · flown by SkyWest	2h 35m Salt Lake City	SLC 11:00 → SFO 12:08DL 902	5h 48m	99%	64%
United Details →	SUN 08:00 → LAX 09:34UA 6053 · flown by SkyWest	3h 51m Los Angeles	LAX 13:25 → SFO 14:53UA 372	7h 53m	92%	60%
United Details →	SUN 14:38 → DEN 16:45UA 5268 · flown by SkyWest	1h 09m Denver	DEN 17:54 → SFO 19:40UA 1007	6h 02m	83%	56%
Delta Details →	SUN 13:10 → SLC 14:24DL 4019 · flown by SkyWest	46m Salt Lake City	SLC 15:10 → SFO 16:12DL 1088	4h 05m	85%	55%

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

DEN · 1h 09m · leaves 14:38 17%

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.


Alaska AS 2325 SUN 10:20 → SEA Delta DL 3707 SEA 14:30 → SFO Connection details →	3h 16m	7h 30m	100%	70%
United UA 6008 SUN 13:57 → LAX Delta DL 1559 LAX 17:35 → SFO Connection details →	2h 04m	5h 59m	96%	66%
Delta DL 4019 SUN 13:10 → SLC Frontier F9 3393 SLC 16:56 → SFO Connection details →	2h 32m	6h 10m	95%	64%

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