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

The nonstop is quickest: United ASE → SFO (2h 53m), on time 3 times in 5. United via Denver (5h 32m) is more reliable, 71%, but takes 2h 39m longer.

Nonstops (seasonal or thin)


United	ASE	SFO	2h 53m	62%	5.6%	376	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 Aspen). Layovers up to 4 hours. Pick a connection for the details.


United Details →	ASE 08:32 → DEN 09:50UA 4687 · flown by SkyWest	3h 35m Denver	DEN 13:25 → SFO 15:09UA 1812	7h 37m	99%	75%
American Details →	ASE 17:51 → LAX 19:10AA 6387 · flown by SkyWest	3h 22m Los Angeles	LAX 22:32 → SFO 23:59AA 6510 · flown by SkyWest	7h 08m	94%	72%
United Details →	ASE 11:32 → DEN 12:45UA 5772 · flown by SkyWest	3h 02m Denver	DEN 15:47 → SFO 17:30UA 2633	6h 58m	95%	68%
United Details →	ASE 07:30 → DEN 08:48UA 5766 · flown by SkyWest	2h 33m Denver	DEN 11:21 → SFO 13:04UA 1561	6h 34m	97%	67%
United Details →	ASE 13:07 → DEN 14:20UA 5774 · flown by SkyWest	3h 34m Denver	DEN 17:54 → SFO 19:40UA 1007	7h 33m	95%	62%
United Details →	ASE 07:00 → IAH 10:47UA 5300 · flown by SkyWest	2h 11m Houston	IAH 12:58 → SFO 15:03UA 2756	9h 03m	93%	60%
United Details →	ASE 09:00 → ORD 13:04UA 4669 · flown by SkyWest	1h 26m Chicago	ORD 14:30 → SFO 17:19UA 1577	9h 19m	83%	59%
United Details →	ASE 11:43 → IAH 15:40UA 5493 · flown by SkyWest	2h 25m Houston	IAH 18:05 → SFO 20:10UA 1341	9h 27m	92%	54%
Tight connection: often missed
United Details →	ASE 15:25 → DEN 16:38UA 5776 · flown by SkyWest	1h 16m Denver	DEN 17:54 → SFO 19:40UA 1007	5h 15m	72%	46%
Delta Details →	ASE 12:03 → LAX 13:27DL 4133 · flown by SkyWest	58m Los Angeles	LAX 14:25 → SFO 15:44DL 2267	4h 45m	72%	34%
United Details →	ASE 19:15 → LAX 20:43UA 5940 · flown by SkyWest	51m Los Angeles	LAX 21:34 → SFO 23:02UA 2056	4h 47m	59%	32%

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

DEN · 55m · leaves 07:30 13%

Afternoon and evening

DEN · 1h 16m · leaves 15:25 28%

LAX · 51m · leaves 19:15 41%

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.


Delta DL 4133 ASE 12:03 → LAX United UA 233 LAX 17:10 → SFO Connection details →	3h 43m	7h 35m	95%	76%
American AA 6205 ASE 13:46 → AUS United UA 292 AUS 20:01 → SFO Connection details →	2h 52m	9h 04m	90%	54%
United UA 5940 ASE 19:15 → LAX American AA 6510 LAX 22:32 → SFO Connection details →	1h 49m	5h 44m	66%	48%

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