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

Pick an hour to see this route’s flights leaving then.

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