Itineraries flown on 20+ days in the Jun 6 – Jul 31, 2026 schedule · each leg’s record Aug 2025 – Jul 2026

No clear winner: Southwest’s LGB → DEN flights land within a few points of 83% on time whatever the hour.

Nonstops


Southwest	LGB	DEN	2h 20m	83%	0.1%	1,007	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Southwest Details →	LGB 06:55 → SMF 08:20WN 2503	1h 55m Sacramento	SMF 10:15 → DEN 13:35WN 3774	5h 40m	100%	96%
Southwest Details →	LGB 08:00 → SLC 10:45WN 2501	1h 35m Salt Lake City	SLC 12:20 → DEN 13:50WN 1478	4h 50m	100%	85%
Southwest Details →	LGB 06:50 → LAS 08:05WN 2484	50m Las Vegas	LAS 08:55 → DEN 11:50WN 247	4h 00m	92%	79%
Southwest Details →	LGB 07:50 → PHX 09:10WN 2491	1h 50m Phoenix	PHX 11:00 → DEN 13:45WN 3262	4h 55m	98%	79%
Delta Details →	LGB 07:00 → SLC 09:53DL 3135	3h 27m Salt Lake City	SLC 13:20 → DEN 14:56DL 1623	6h 56m	96%	77%
Southwest Details →	LGB 13:30 → SMF 14:55WN 2505	2h 45m Sacramento	SMF 17:40 → DEN 21:00WN 670	6h 30m	100%	77%
Delta Details →	LGB 16:55 → SLC 19:56DL 3793 · flown by SkyWest	1h 09m Salt Lake City	SLC 21:05 → DEN 22:40DL 1667	4h 45m	94%	74%
Southwest Details →	LGB 16:30 → SJC 17:45WN 4307	1h 55m San Jose	SJC 19:40 → DEN 23:05WN 4247	5h 35m	98%	74%
Tight connection: often missed
Southwest Details →	LGB 13:05 → SLC 15:50WN 2411	55m Salt Lake City	SLC 16:45 → DEN 18:15WN 3740	4h 10m	62%	18%
Southwest Details →	LGB 16:15 → PHX 17:35WN 2493	1h 05m Phoenix	PHX 18:40 → DEN 21:25WN 3266	4h 10m	67%	16%

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

LAS · 50m · leaves 06:50 8%

Afternoon and evening

SLC · 1h 09m · leaves 16:55 6%

AUS · 1h 05m · leaves 12:35 12%

PHX · 1h 05m · leaves 16:15 33%

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.


Southwest WN 2503 LGB 06:55 → SMF United UA 1023 SMF 10:50 → DEN Connection details →	2h 30m	6h 22m	100%	92%
Southwest WN 2501 LGB 08:00 → SLC United UA 4720 SLC 13:05 → DEN Connection details →	2h 20m	5h 51m	100%	92%
Southwest WN 2484 LGB 06:50 → LAS United UA 1315 LAS 09:37 → DEN Connection details →	1h 32m	4h 51m	90%	82%

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