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 6% of the time at 12 pm and 29% of the time at 5 pm.

Nonstops (seasonal or thin)


United	DEN	PWM	3h 55m	83%	0.0%	214	Flying now

Best connections, any airlines

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Portland on time. Total trip = scheduled departure to arrival, layover included (Portland is 2 h ahead of Denver). Layovers up to 4 hours. Pick a connection for the details.


United Details →	DEN 23:59 → IAD 05:27UA 1924	2h 53m Dulles	IAD 08:20 → PWM 10:07 +1UA 3548 · flown by Republic	8h 08m	100%	96%
Southwest Details →	DEN 23:50 → BWI 05:15WN 1501	2h 57m Baltimore	BWI 08:12 → PWM 09:50 +1WN 4439	7h 57m	100%	94%
United Details →	DEN 23:59 → EWR 05:40UA 1745	2h 08m Newark	EWR 07:48 → PWM 09:14 +1UA 3665 · flown by Republic	7h 15m	99%	89%
United + Americantwo ticketsDetails →	DEN 23:59 → PHL 05:31UA 1214	3h 19m Philadelphia	PHL 08:50 → PWM 10:31 +1AA 6124 · flown by Piedmont	8h 32m	98%	88%
Delta Details →	DEN 06:05 → DTW 10:57DL 1745	3h 03m Detroit	DTW 14:00 → PWM 15:55DL 1821	7h 50m	98%	85%
United Details →	DEN 06:13 → IAD 11:41UA 1279	1h 04m Dulles	IAD 12:45 → PWM 14:34UA 3535 · flown by Republic	6h 21m	94%	85%
United + Americantwo ticketsDetails →	DEN 07:40 → ORD 11:23UA 1928	3h 57m Chicago	ORD 15:20 → PWM 18:58AA 4774 · flown by Republic	9h 14m	100%	82%
United Details →	DEN 06:00 → ORD 09:42UA 1377	1h 18m Chicago	ORD 11:00 → PWM 14:31UA 2804	6h 31m	94%	80%
Tight connection: often missed
United Details →	DEN 15:40 → IAD 21:11UA 421	59m Dulles	IAD 22:10 → PWM 23:51UA 2064	6h 11m	70%	52%
United Details →	DEN 13:25 → ORD 17:05UA 617	1h 03m Chicago	ORD 18:08 → PWM 21:41UA 1401	6h 16m	71%	41%

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

IAD · 1h 04m · leaves 06:13 6%

ORD · 1h 18m · leaves 06:00 6%

Afternoon and evening

CLT · 1h 00m · leaves 13:56 25%

ORD · 1h 03m · leaves 13:25 29%

IAD · 59m · leaves 15:40 30%

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.

The table above includes two-ticket connections (marked “two tickets”), held to the 90-minute minimum. One ticket only →

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