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

Connect in the morning. The same one-hour layover misses 4% of the time at 9 am and 43% of the time at 4 pm.

Nonstops


Frontier	DEN	PDX	2h 46m	84%	0.4%	280	Flying now
United	DEN	PDX	2h 43m	83%	0.3%	1,825	Flying now
Alaska	DEN	PDX	2h 46m	80%	0.3%	625	Flying now
Southwest	DEN	PDX	2h 40m	64%	0.1%	1,555	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


Alaska Details →	DEN 06:02 → SEA 08:05AS 643	2h 09m Seattle	SEA 10:14 → PDX 11:21AS 3090 · flown by SkyWest	6h 19m	97%	94%
United Details →	DEN 05:15 → SFO 06:53UA 2367	1h 29m San Francisco	SFO 08:22 → PDX 10:20UA 2265	6h 05m	98%	89%
Southwest Details →	DEN 10:20 → SMF 11:55WN 1740	2h 20m Sacramento	SMF 14:15 → PDX 15:45WN 422	6h 25m	100%	88%
Alaska Details →	DEN 06:00 → SAN 07:34AS 1617	3h 30m San Diego	SAN 11:04 → PDX 13:43AS 576	8h 43m	100%	86%
United Details →	DEN 09:43 → SFO 11:25UA 1506	3h 30m San Francisco	SFO 14:55 → PDX 16:47UA 2851	8h 04m	99%	86%
Delta Details →	DEN 19:00 → SLC 20:38DL 2663	2h 12m Salt Lake City	SLC 22:50 → PDX 23:44DL 1373	5h 45m	95%	85%
Alaska Details →	DEN 08:40 → SEA 10:42AS 317	3h 03m Seattle	SEA 13:45 → PDX 14:48AS 3204 · flown by SkyWest	7h 08m	100%	85%
Delta Details →	DEN 07:05 → SLC 08:36DL 1581	2h 39m Salt Lake City	SLC 11:15 → PDX 12:10DL 1209	6h 05m	96%	84%
Tight connection: often missed
United Details →	DEN 19:34 → SFO 21:20UA 1389	1h 32m San Francisco	SFO 22:52 → PDX 00:50 +1UA 2384	6h 16m	64%	48%
United Details →	DEN 17:54 → SFO 19:40UA 1007	1h 10m San Francisco	SFO 20:50 → PDX 22:48UA 2413	5h 54m	74%	41%
American Details →	DEN 14:22 → ORD 18:16AA 1760	1h 04m Chicago	ORD 19:20 → PDX 21:50AA 2977	8h 28m	62%	31%

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

IAH · 58m · leaves 05:00 4%

DFW · 1h 13m · leaves 06:20 6%

LAX · 1h 00m · leaves 07:30 10%

Afternoon and evening

DFW · 51m · leaves 12:39 43%

SJC · 1h 15m · leaves 18:55 51%

SMF · 55m · leaves 19:25 98%

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 1240 DEN 07:45 → OAK Alaska AS 3045 OAK 12:01 → PDX Connection details →	2h 36m	6h 59m	100%	96%
United UA 2149 DEN 08:00 → SMF Alaska AS 621 SMF 11:46 → PDX Connection details →	2h 11m	6h 18m	98%	95%
Southwest WN 2689 DEN 07:50 → RNO Alaska AS 3121 RNO 12:07 → PDX Connection details →	2h 57m	6h 56m	100%	94%

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