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 MSO → SEA flights land within a few points of 82% on time whatever the hour.

Nonstops


Alaska	MSO	SEA	1h 40m	82%	1.2%	1,187	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Delta Details →	MSO 18:29 → SLC 20:15DL 3808 · flown by SkyWest	2h 30m Salt Lake City	SLC 22:45 → SEA 23:59DL 2998	6h 30m	99%	90%
Alaska Details →	MSO 17:41 → PDX 18:16AS 3098 · flown by SkyWest	3h 14m Portland	PDX 21:30 → SEA 22:27AS 2421 · flown by Horizon	5h 46m	100%	90%
United Details →	MSO 10:36 → DEN 12:48UA 5484 · flown by SkyWest	1h 12m Denver	DEN 14:00 → SEA 16:00UA 2164	6h 24m	100%	84%
Delta Details →	MSO 05:31 → SLC 07:04DL 2795	46m Salt Lake City	SLC 07:50 → SEA 09:05DL 2874	4h 34m	86%	79%
Delta Details →	MSO 13:17 → SLC 15:00DL 4112 · flown by SkyWest	2h 20m Salt Lake City	SLC 17:20 → SEA 18:36DL 871	6h 19m	99%	78%
United Details →	MSO 14:25 → DEN 16:30UA 1436	2h 40m Denver	DEN 19:10 → SEA 21:10UA 360	7h 45m	94%	64%
United Details →	MSO 17:20 → DEN 19:40UA 5632 · flown by SkyWest	1h 30m Denver	DEN 21:10 → SEA 23:10UA 2651	6h 50m	83%	60%
Alaska Details →	MSO 14:04 → SAN 15:56AS 2169 · flown by Horizon	1h 39m San Diego	SAN 17:35 → SEA 20:35AS 417	7h 31m	82%	56%

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

SLC · 46m · leaves 05:31 14%

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 3098 MSO 17:41 → PDX Delta DL 3923 PDX 20:44 → SEA Connection details →	2h 28m	5h 15m	94%	75%
United UA 1026 MSO 06:05 → DEN Southwest WN 3051 DEN 10:05 → SEA Connection details →	1h 54m	7h 00m	94%	71%
United UA 5417 MSO 16:19 → SFO Alaska AS 591 SFO 20:28 → SEA Connection details →	2h 38m	7h 22m	92%	65%

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