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 8% of the time at 8 am and 44% of the time at 7 pm.

Nonstops (seasonal or thin)


United	IAD	PDX	5h 42m	76%	0.7%	291	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 3 h behind Dulles). Layovers up to 4 hours. Pick a connection for the details.


United + Alaskatwo ticketsDetails →	IAD 06:30 → DEN 08:22UA 2031	3h 40m Denver	DEN 12:02 → PDX 13:46AS 684	10h 16m	100%	88%
United + Alaskatwo ticketsDetails →	IAD 13:10 → LAX 15:42UA 1689	2h 45m Los Angeles	LAX 18:27 → PDX 20:48AS 1397	10h 38m	99%	88%
United Details →	IAD 08:15 → DEN 10:10UA 792	3h 17m Denver	DEN 13:27 → PDX 15:13UA 2455	9h 58m	97%	88%
United + Alaskatwo ticketsDetails →	IAD 08:15 → LAX 10:47UA 1734	3h 40m Los Angeles	LAX 14:27 → PDX 16:47AS 1315	11h 32m	98%	88%
Delta + Alaskatwo ticketsDetails →	IAD 07:15 → SLC 09:52DL 432	2h 54m Salt Lake City	SLC 12:46 → PDX 13:49AS 3117 · flown by SkyWest	9h 34m	96%	87%
United + Alaskatwo ticketsDetails →	IAD 15:15 → LAX 17:47UA 684	3h 48m Los Angeles	LAX 21:35 → PDX 23:56AS 207	11h 41m	99%	87%
United Details →	IAD 06:30 → IAH 08:39UA 1935	51m Houston	IAH 09:30 → PDX 11:56UA 740	8h 26m	100%	86%
United Details →	IAD 08:35 → SFO 11:19UA 1147	3h 36m San Francisco	SFO 14:55 → PDX 16:47UA 2851	11h 12m	100%	86%
Tight connection: often missed
Delta Details →	IAD 07:00 → SEA 09:45DL 1015	50m Seattle	SEA 10:35 → PDX 11:42DL 3802 · flown by SkyWest	7h 42m	67%	56%
Delta Details →	IAD 18:55 → MSP 20:52DL 3783 · flown by SkyWest	46m Minneapolis	MSP 21:38 → PDX 23:18DL 2391	7h 23m	66%	51%
American Details →	IAD 19:31 → DFW 21:50AA 1904	1h 02m Dallas-Fort Worth	DFW 22:52 → PDX 00:52 +1AA 2620	8h 22m	52%	21%

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

MSP · 1h 05m · leaves 06:00 8%

SFO · 1h 03m · leaves 06:30 11%

DTW · 1h 14m · leaves 06:00 12%

Afternoon and evening

MSP · 46m · leaves 18:55 34%

ORD · 1h 05m · leaves 17:42 44%

DFW · 1h 02m · leaves 19:31 48%

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