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 PDX → BIL flights land within a few points of 9 in 10 on time whatever the hour.

Nonstops (seasonal or thin)


Alaska	PDX	BIL	1h 51m	90%	0.6%	353	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Delta Details →	PDX 05:45 → SLC 08:39DL 1270	1h 01m Salt Lake City	SLC 09:40 → BIL 11:09DL 4038 · flown by SkyWest	4h 24m	99%	93%
Alaska Details →	PDX 17:30 → SEA 18:33AS 430	2h 26m Seattle	SEA 20:59 → BIL 23:51AS 2457 · flown by Horizon	5h 21m	100%	91%
Delta Details →	PDX 09:45 → SLC 12:35DL 1203	3h 58m Salt Lake City	SLC 16:33 → BIL 18:00DL 3828 · flown by SkyWest	7h 15m	100%	86%
United Details →	PDX 08:50 → DEN 12:24UA 2375	1h 21m Denver	DEN 13:45 → BIL 15:29UA 5845 · flown by SkyWest	5h 39m	98%	80%
Alaska Details →	PDX 06:19 → SEA 07:17AS 499	2h 52m Seattle	SEA 10:09 → BIL 13:05AS 2054 · flown by Horizon	5h 46m	100%	80%
United Details →	PDX 05:00 → DEN 08:31UA 459	3h 14m Denver	DEN 11:45 → BIL 13:22UA 703	7h 22m	99%	79%
United Details →	PDX 12:50 → DEN 16:28UA 1411	3h 12m Denver	DEN 19:40 → BIL 21:17UA 1417	7h 27m	98%	79%
Alaska Details →	PDX 12:03 → SEA 13:03AS 3078 · flown by SkyWest	2h 46m Seattle	SEA 15:49 → BIL 18:42AS 2353 · flown by Horizon	5h 39m	96%	78%

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 · 1h 01m · leaves 05:45 1%

SEA · 55m · leaves 08:19 12%

Afternoon and evening

DEN · 1h 19m · leaves 16:15 9%

SLC · 1h 06m · leaves 17:24 11%

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 3112 PDX 10:55 → SLC Delta DL 3828 SLC 16:33 → BIL Connection details →	2h 34m	6h 05m	98%	87%
Southwest WN 4099 PDX 07:30 → DEN United UA 5845 DEN 13:45 → BIL Connection details →	2h 45m	6h 59m	100%	83%
Delta DL 3918 PDX 17:50 → SEA Alaska AS 2457 SEA 20:59 → BIL Connection details →	1h 54m	5h 01m	91%	83%

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