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 1 time in 10 at 11 am and 29% of the time at 6 pm.

Nonstops


Delta	SEA	DCA	5h 06m	92%	2.7%	364	Flying now
Alaska	SEA	DCA	5h 16m	78%	0.8%	728	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

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


United Details →	SEA 23:49 → IAH 06:10UA 2379	1h 36m Houston	IAH 07:46 → DCA 11:56 +1UA 2047	9h 07m	94%	91%
Southwest Details →	SEA 23:05 → MDW 05:00WN 2304	3h 15m Chicago	MDW 08:15 → DCA 11:10 +1WN 2569	9h 05m	100%	91%
American Details →	SEA 20:45 → MIA 05:37AA 1471	2h 25m Miami	MIA 08:02 → DCA 10:38 +1AA 1299	10h 53m	95%	86%
American Details →	SEA 18:15 → PHX 21:18AA 4035 · flown by Envoy	2h 34m Phoenix	PHX 23:52 → DCA 07:14 +1AA 1542	9h 59m	98%	86%
American Details →	SEA 21:35 → CLT 05:41AA 2793	2h 19m Charlotte	CLT 08:00 → DCA 09:29 +1AA 1977	8h 58m	97%	85%
Delta Details →	SEA 22:20 → JFK 06:34DL 452	2h 01m New York	JFK 08:35 → DCA 10:02 +1DL 5750 · flown by Republic	8h 42m	98%	84%
Delta Details →	SEA 23:10 → DTW 06:27DL 810	3h 38m Detroit	DTW 10:05 → DCA 11:34 +1DL 2476	9h 24m	99%	84%
Delta Details →	SEA 23:15 → BOS 07:35DL 473	2h 50m Boston	BOS 10:25 → DCA 12:12 +1DL 5592 · flown by Republic	9h 57m	99%	83%
Tight connection: often missed
Southwest Details →	SEA 23:05 → MDW 05:00WN 2304	1h 00m Chicago	MDW 06:00 → DCA 08:45 +1WN 4976	6h 40m	67%	63%
American Details →	SEA 11:40 → DFW 17:50AA 767	1h 03m Dallas-Fort Worth	DFW 18:53 → DCA 22:59AA 2752	8h 20m	71%	42%
United Details →	SEA 10:52 → ORD 17:05UA 2835	55m Chicago	ORD 18:00 → DCA 21:10UA 1369	7h 18m	62%	30%

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

ORD · 1h 00m · leaves 23:56 6%

DFW · 52m · leaves 05:05 10%

DEN · 47m · leaves 05:00 13%

Afternoon and evening

JFK · 1h 05m · leaves 11:40 22%

DFW · 1h 03m · leaves 11:40 29%

ORD · 55m · leaves 10:52 38%

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.


Delta DL 448 SEA 23:15 → MCO American AA 2088 MCO 10:40 → DCA Connection details →	2h 58m	10h 44m	99%	90%
Alaska AS 624 SEA 22:39 → IND American AA 4434 IND 09:32 → DCA Connection details →	3h 48m	9h 40m	100%	90%
Alaska AS 269 SEA 22:13 → CLE American AA 4737 CLE 08:46 → DCA Connection details →	3h 03m	8h 56m	99%	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