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

No clear winner: airlines and hours on this route all land within a few points of 87% on time.

Nonstops (seasonal or thin)


Alaska	PDX	BWI	5h 11m	95%	0.0%	80	Flying now
Southwest	PDX	BWI	5h 00m	82%	0.0%	120	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Baltimore on time. Total trip = scheduled departure to arrival, layover included (Baltimore is 3 h ahead of Portland). Layovers up to 4 hours. Pick a connection for the details.


Alaska Details →	PDX 17:30 → SEA 18:33AS 430	3h 03m Seattle	SEA 21:36 → BWI 05:41 +1AS 781	9h 11m	100%	90%
United Details →	PDX 22:40 → ORD 04:45UA 2094	1h 45m Chicago	ORD 06:30 → BWI 09:27 +1UA 1269	7h 47m	96%	90%
United Details →	PDX 05:15 → SFO 07:01UA 1896	2h 32m San Francisco	SFO 09:33 → BWI 17:57UA 2664	9h 42m	99%	89%
Southwest Details →	PDX 23:30 → MDW 05:20WN 3203	3h 35m Chicago	MDW 08:55 → BWI 11:45 +1WN 1355	9h 15m	100%	89%
Delta Details →	PDX 00:33 → MSP 05:49DL 2359	1h 21m Minneapolis	MSP 07:10 → BWI 10:42DL 2357	7h 09m	96%	86%
United Details →	PDX 05:00 → DEN 08:31UA 459	1h 15m Denver	DEN 09:46 → BWI 15:17UA 1362	7h 17m	98%	86%
Delta Details →	PDX 22:55 → ATL 06:27DL 564	2h 28m Atlanta	ATL 08:55 → BWI 10:47 +1DL 801	8h 52m	94%	82%
Alaska Details →	PDX 05:00 → SEA 05:53AS 2431 · flown by Horizon	3h 10m Seattle	SEA 09:03 → BWI 17:04AS 378	9h 04m	100%	82%
Tight connection: often missed
Alaska Details →	PDX 19:38 → SEA 20:33AS 2313 · flown by Horizon	1h 03m Seattle	SEA 21:36 → BWI 05:41 +1AS 781	7h 03m	58%	53%
American Details →	PDX 13:45 → ORD 19:50AA 3303	1h 10m Chicago	ORD 21:00 → BWI 23:59AA 3866 · flown by Envoy	7h 14m	64%	36%

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

DEN · 1h 15m · leaves 05:00 2%

ATL · 1h 08m · leaves 22:55 19%

Afternoon and evening

MDW · 1h 15m · leaves 11:50 20%

ORD · 1h 10m · leaves 13:45 36%

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 436 PDX 21:56 → BOS Southwest WN 732 BOS 08:55 → BWI Connection details →	2h 35m	9h 34m	98%	90%
Alaska AS 278 PDX 17:37 → LAX United UA 1605 LAX 23:05 → BWI Connection details →	2h 56m	10h 37m	98%	89%
Delta DL 3918 PDX 17:50 → SEA Alaska AS 781 SEA 21:36 → BWI Connection details →	2h 31m	8h 51m	98%	88%

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