1,092 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Delta is clearly ahead here: 92% of its flights arrive on time, 14 points better than Alaska.

Best time to leave 7–8 am 92% arrive on time from SEA

Best single flight DL 786 SEA 07:20 → DCA 15:26 · 91% on time Avoid AS 2 SEA 13:46 → DCA 21:59 · 70% on time

Time of day × airport

Share of this route’s flights leaving within 15 minutes, by airport and scheduled departure hour, over Aug 2025 – Jul 2026. Blank: no flights then (or fewer than 40 in the year).

SEA

% of this route’s flights leaving within 15 min (small number: flights in the Jun 6 – Jul 31, 2026 schedule): 85+75–8465–7455–64under 55

Washington flights leaving SEA 1–2 pm: 1Close ×


AS 2	SEA 13:46	DCA 21:59	5h 13m	363	70%	1.1%	57 min

Airlines on this route

Arriving within 15 minutes. Regional flights count under the airline that sells them. Pick an airline to see its flights.


Delta	364	92%	2.7%	120 min
Alaska	728	78%	0.8%	54 min

Flights, best and worst

Flights in the Jun 6 – Jul 31, 2026 schedule that ran 150+ times in the year. Times are local. Pick a flight for its history.


DL 786	SEA 07:20	DCA 15:26	91%
AS 4	SEA 08:00	DCA 16:16	86%
AS 2	SEA 13:46	DCA 21:59	70%

Nonstops by airline and airport

Arriving within 15 minutes, Aug 2025 – Jul 2026. Pick a row to see that airline’s flights on that airport pair.


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

Flying on a particular day? Pick a date above and the same ranking uses our forecast odds for each flight that day: Tomorrow.

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