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 7% of the time at 8 am and 36% of the time at 10 pm.

Nonstops (seasonal or thin)


Southwest	BWI	SEA	5h 45m	73%	0.8%	120	Flying now
Alaska	BWI	SEA	5h 51m	72%	1.0%	599	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


United Details →	BWI 07:00 → LAX 09:29UA 2318	2h 14m Los Angeles	LAX 11:43 → SEA 14:36UA 325	10h 36m	99%	86%
United Details →	BWI 10:32 → ORD 11:48UA 704	1h 42m Chicago	ORD 13:30 → SEA 16:09UA 1660	8h 37m	100%	86%
Alaska Details →	BWI 16:19 → PDX 18:56AS 1369	2h 34m Portland	PDX 21:30 → SEA 22:27AS 2421 · flown by Horizon	9h 08m	94%	85%
Delta Details →	BWI 07:00 → ATL 08:56DL 2579	2h 14m Atlanta	ATL 11:10 → SEA 13:38DL 648	9h 38m	99%	84%
Delta Details →	BWI 06:19 → MSP 07:56DL 2872	3h 14m Minneapolis	MSP 11:10 → SEA 12:58DL 889	9h 39m	99%	84%
United Details →	BWI 08:30 → DEN 10:25UA 2412	3h 35m Denver	DEN 14:00 → SEA 16:00UA 2164	10h 30m	99%	83%
Delta Details →	BWI 07:10 → SLC 09:49DL 1176	1h 46m Salt Lake City	SLC 11:35 → SEA 12:52DL 2995	8h 42m	95%	82%
United Details →	BWI 06:15 → ORD 07:30UA 709	1h 15m Chicago	ORD 08:45 → SEA 11:38UA 2099	8h 23m	97%	81%
Tight connection: often missed
Delta Details →	BWI 18:24 → ATL 20:34DL 1267	1h 01m Atlanta	ATL 21:35 → SEA 23:59DL 903	8h 35m	75%	58%
United Details →	BWI 16:23 → DEN 18:18UA 2012	52m Denver	DEN 19:10 → SEA 21:10UA 360	7h 47m	71%	48%
American Details →	BWI 19:17 → DFW 21:42AA 1626	59m Dallas-Fort Worth	DFW 22:41 → SEA 00:57 +1AA 1487	8h 40m	51%	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 09m · leaves 06:19 7%

DTW · 50m · leaves 06:08 9%

ATL · 56m · leaves 07:00 11%

Afternoon and evening

LAS · 1h 10m · leaves 18:40 41%

DFW · 59m · leaves 19:17 49%

DEN · 55m · leaves 16:55 52%

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 1049 BWI 07:00 → PHX Delta DL 2419 PHX 12:05 → SEA Connection details →	3h 15m	11h 18m	100%	93%
Southwest WN 1086 BWI 06:20 → SAN Delta DL 2508 SAN 11:05 → SEA Connection details →	2h 30m	11h 01m	100%	89%
Southwest WN 973 BWI 06:25 → LAS Delta DL 2922 LAS 10:59 → SEA Connection details →	2h 34m	10h 26m	100%	89%

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