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 MFR → SFO flights land within a few points of 2 in 3 on time whatever the hour.

Nonstops


United	MFR	SFO	1h 35m	68%	0.8%	1,031	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. Layovers up to 4 hours. Pick a connection for the details.


Delta Details →	MFR 17:25 → SEA 19:04DL 3770 · flown by SkyWest	2h 41m Seattle	SEA 21:45 → SFO 00:06 +1DL 2635	6h 41m	99%	69%
Alaska Details →	MFR 12:30 → PDX 13:34AS 3300 · flown by SkyWest	1h 15m Portland	PDX 14:49 → SFO 16:40AS 236	4h 10m	94%	69%
Delta Details →	MFR 05:20 → SLC 08:18DL 3769 · flown by SkyWest	2h 42m Salt Lake City	SLC 11:00 → SFO 12:08DL 902	6h 48m	99%	64%
Alaska Details →	MFR 13:27 → SEA 14:55AS 3087 · flown by SkyWest	1h 41m Seattle	SEA 16:36 → SFO 18:48AS 1385	5h 21m	93%	64%
Alaska Details →	MFR 06:11 → SAN 08:24AS 3289 · flown by SkyWest	2h 40m San Diego	SAN 11:04 → SFO 12:51AS 3347 · flown by SkyWest	6h 40m	100%	63%
Delta Details →	MFR 06:01 → SEA 07:40DL 3781 · flown by SkyWest	2h 05m Seattle	SEA 09:45 → SFO 12:08DL 1412	6h 07m	100%	62%
Alaska Details →	MFR 10:31 → SEA 11:53AS 2114 · flown by Horizon	1h 27m Seattle	SEA 13:20 → SFO 15:31AS 680	5h 00m	92%	60%
Alaska Details →	MFR 19:35 → PDX 20:34AS 2107 · flown by Horizon	1h 11m Portland	PDX 21:45 → SFO 23:36AS 2112 · flown by Horizon	4h 01m	91%	55%
Tight connection: often missed
Alaska Details →	MFR 15:52 → PDX 16:50AS 2081 · flown by Horizon	46m Portland	PDX 17:36 → SFO 19:30AS 504	3h 38m	70%	41%

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

PDX · 1h 05m · leaves 05:15 3%

DEN · 1h 10m · leaves 05:00 6%

Afternoon and evening

DEN · 1h 11m · leaves 13:10 19%

LAX · 59m · leaves 16:34 23%

PDX · 46m · leaves 15:52 30%

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 2329 MFR 16:34 → LAX American AA 6510 LAX 22:32 → SFO Connection details →	3h 57m	7h 25m	98%	79%
Alaska AS 3289 MFR 06:11 → SAN United UA 2428 SAN 11:55 → SFO Connection details →	3h 31m	7h 30m	100%	72%
Delta DL 3781 MFR 06:01 → SEA United UA 1482 SEA 10:29 → SFO Connection details →	2h 49m	6h 46m	100%	69%

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