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

No clear winner: Alaska’s SEA → FCA flights land within a few points of 86% on time whatever the hour.

Nonstops


Alaska	SEA	FCA	1h 22m	86%	1.4%	1,063	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Delta Details →	SEA 05:30 → SLC 08:30DL 1128	2h 20m Salt Lake City	SLC 10:50 → FCA 12:47DL 3804 · flown by SkyWest	6h 17m	98%	93%
Alaska Details →	SEA 06:42 → PDX 07:37AS 2432 · flown by Horizon	3h 29m Portland	PDX 11:06 → FCA 13:30AS 2044 · flown by Horizon	5h 48m	100%	89%
Delta Details →	SEA 09:30 → SLC 12:38DL 1016	3h 03m Salt Lake City	SLC 15:41 → FCA 17:30DL 3798 · flown by SkyWest	7h 00m	99%	88%
United Details →	SEA 05:00 → DEN 08:43UA 2601	2h 32m Denver	DEN 11:15 → FCA 13:30UA 1547	7h 30m	99%	81%
Delta Details →	SEA 06:05 → MSP 11:24DL 943	1h 11m Minneapolis	MSP 12:35 → FCA 14:33DL 2575	7h 28m	97%	76%
United Details →	SEA 08:56 → DEN 12:45UA 1505	1h 08m Denver	DEN 13:53 → FCA 16:11UA 2246	6h 15m	93%	72%
United Details →	SEA 07:00 → SFO 09:18UA 1578	2h 42m San Francisco	SFO 12:00 → FCA 15:30UA 5577 · flown by SkyWest	7h 30m	94%	63%
Tight connection: often missed
United Details →	SEA 08:45 → SFO 11:03UA 2831	57m San Francisco	SFO 12:00 → FCA 15:30UA 5577 · flown by SkyWest	5h 45m	28%	18%

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 17m · leaves 08:45 3%

MSP · 1h 11m · leaves 06:05 3%

SLC · 1h 10m · leaves 05:30 4%

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 360 SEA 08:48 → SLC Delta DL 3798 SLC 15:41 → FCA Connection details →	3h 46m	7h 42m	100%	90%
Delta DL 3953 SEA 07:30 → PDX Alaska AS 2044 PDX 11:06 → FCA Connection details →	2h 27m	5h 00m	98%	89%
Alaska AS 368 SEA 14:45 → SLC Delta DL 1464 SLC 21:10 → FCA Connection details →	3h 22m	7h 10m	95%	80%

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