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 → MSO flights land within a few points of 85% on time whatever the hour.

Nonstops


Alaska	SEA	MSO	1h 28m	85%	1.1%	1,189	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Missoula on time. Total trip = scheduled departure to arrival, layover included (Missoula 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 23m Salt Lake City	SLC 10:53 → MSO 12:37DL 4112 · flown by SkyWest	6h 07m	98%	91%
United Details →	SEA 05:00 → DEN 08:43UA 2601	2h 32m Denver	DEN 11:15 → MSO 13:19UA 1342	7h 19m	99%	91%
Delta Details →	SEA 09:30 → SLC 12:38DL 1016	3h 32m Salt Lake City	SLC 16:10 → MSO 17:49DL 3808 · flown by SkyWest	7h 19m	99%	89%
Delta Details →	SEA 06:05 → MSP 11:24DL 943	1h 26m Minneapolis	MSP 12:50 → MSO 14:39DL 362	7h 34m	97%	83%
United Details →	SEA 08:56 → DEN 12:45UA 1505	1h 15m Denver	DEN 14:00 → MSO 16:20UA 4783 · flown by SkyWest	6h 24m	94%	80%
Delta Details →	SEA 17:59 → SLC 21:09DL 1165	1h 46m Salt Lake City	SLC 22:55 → MSO 00:28 +1DL 1723	5h 29m	93%	77%
United Details →	SEA 12:50 → DEN 16:42UA 1351	2h 48m Denver	DEN 19:30 → MSO 21:39UA 1092	7h 49m	98%	76%
Alaska Details →	SEA 10:14 → PDX 11:21AS 3090 · flown by SkyWest	3h 09m Portland	PDX 14:30 → MSO 17:01AS 3097 · flown by SkyWest	5h 47m	100%	72%
Tight connection: often missed
United Details →	SEA 08:45 → SFO 11:03UA 2831	1h 12m San Francisco	SFO 12:15 → MSO 15:38UA 5422 · flown by SkyWest	5h 53m	47%	26%

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

SFO · 1h 12m · leaves 08:45 53%

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 3615 SEA 05:15 → DEN United UA 1342 DEN 11:15 → MSO Connection details →	2h 25m	7h 04m	96%	89%
Southwest WN 3397 SEA 07:50 → DEN United UA 4783 DEN 14:00 → MSO Connection details →	2h 35m	7h 30m	98%	84%
Alaska AS 373 SEA 16:47 → SLC Delta DL 1723 SLC 22:55 → MSO Connection details →	3h 05m	6h 41m	98%	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