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 SFO → SUN flights land within a few points of 84% on time whatever the hour.

Nonstops (seasonal or thin)


United	SFO	SUN	2h 04m	84%	0.3%	293	Flying now

Best connections, any airlines

Most reliable Quickest (80%+ on time)

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


Southwest + Unitedtwo ticketsDetails →	SFO 06:05 → LAX 07:35WN 2222	2h 27m Los Angeles	LAX 10:02 → SUN 13:16UA 5980 · flown by SkyWest	6h 11m	100%	100%
United Details →	SFO 13:55 → LAX 15:35UA 2610	3h 10m Los Angeles	LAX 18:45 → SUN 22:01UA 6043 · flown by SkyWest	7h 06m	100%	96%
Delta Details →	SFO 05:50 → SLC 08:42DL 1331	2h 33m Salt Lake City	SLC 11:15 → SUN 12:29DL 3973 · flown by SkyWest	5h 39m	99%	90%
Southwest + Unitedtwo ticketsDetails →	SFO 05:10 → DEN 08:40WN 1424	3h 04m Denver	DEN 11:44 → SUN 13:47UA 5554 · flown by SkyWest	7h 37m	100%	87%
United + Deltatwo ticketsDetails →	SFO 08:40 → SLC 11:49UA 5605 · flown by SkyWest	1h 36m Salt Lake City	SLC 13:25 → SUN 14:34DL 3689 · flown by SkyWest	4h 54m	81%	72%
United Details →	SFO 12:43 → DEN 16:35UA 540	2h 50m Denver	DEN 19:25 → SUN 21:26UA 5734 · flown by SkyWest	7h 43m	96%	61%
Delta + Alaskatwo ticketsDetails →	SFO 10:35 → SEA 12:53DL 2870	3h 32m Seattle	SEA 16:25 → SUN 19:01AS 2322 · flown by Horizon	7h 26m	98%	59%
United + Deltatwo ticketsDetails →	SFO 16:11 → SLC 19:11UA 543	1h 54m Salt Lake City	SLC 21:05 → SUN 22:09DL 3985 · flown by SkyWest	4h 58m	55%	51%
Tight connection: often missed
Delta Details →	SFO 17:07 → SLC 20:02DL 1088	1h 03m Salt Lake City	SLC 21:05 → SUN 22:09DL 3985 · flown by SkyWest	4h 02m	74%	69%

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 14m · leaves 14:20 18%

SLC · 1h 03m · leaves 17:07 26%

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