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, any airlines

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.


Southwest + Deltatwo ticketsDetails →	BWI 07:00 → PHX 08:50WN 1049	3h 15m Phoenix	PHX 12:05 → SEA 15:18DL 2419	11h 18m	100%	93%
Southwest + Deltatwo ticketsDetails →	BWI 06:20 → SAN 08:35WN 1086	2h 30m San Diego	SAN 11:05 → SEA 14:21DL 2508	11h 01m	100%	89%
Southwest + Deltatwo ticketsDetails →	BWI 06:25 → LAS 08:25WN 973	2h 34m Las Vegas	LAS 10:59 → SEA 13:51DL 2922	10h 26m	100%	89%
Southwest + Deltatwo ticketsDetails →	BWI 06:20 → ATL 08:15WN 4689	2h 55m Atlanta	ATL 11:10 → SEA 13:38DL 648	10h 18m	100%	87%
Southwest + Alaskatwo ticketsDetails →	BWI 09:35 → STL 10:50WN 1110	4h 00m St Louis	STL 14:50 → SEA 17:17AS 618	10h 42m	100%	86%
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%
Southwest + Unitedtwo ticketsDetails →	BWI 06:05 → DEN 07:50WN 4436	3h 32m Denver	DEN 11:22 → SEA 13:22UA 1424	10h 17m	100%	86%
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.

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