1,853 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 92% depart on time. After 4 pm it’s 78%.

Best time to leave 8–9 am 91% arrive on time from SEA

Best single flight AS 737 SEA 09:13 → IAD 17:11 · 84% on time Avoid DL 541 SEA 16:20 → IAD 00:25 · 77% 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.


United	657	90%	0.8%	87 min
Alaska	835	83%	0.4%	39 min
Delta	361	77%	1.1%	78 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.


AS 737	SEA 09:13	IAD 17:11	84%
AS 367	SEA 22:43	IAD 06:39	84%
DL 541	SEA 16:20	IAD 00:25	77%

All 9 flights in the current schedule

Every flight that flew in the Jun 6 – Jul 31, 2026 schedule, with its record over Aug 2025 – Jul 2026. Times are local. Click a column to sort.


UA 688	SEA 08:00	IAD 16:09	5h 09m	34	94%	0.0%	18 min
UA 2463	SEA 08:15	IAD 16:24	5h 09m	37	92%	0.0%	140 min
AS 737	SEA 09:13	IAD 17:11	4h 58m	206	84%	0.5%	43 min
UA 2131	SEA 13:00	IAD 21:06	5h 06m	95	93%	0.0%	44 min
AS 348	SEA 15:53	IAD 23:59	5h 06m	132	81%	0.8%	34 min
AS 406	SEA 16:01	IAD 23:59	4h 58m	138	81%	0.7%	37 min
DL 541	SEA 16:20	IAD 00:25	5h 05m	349	77%	1.1%	77 min
AS 367	SEA 22:43	IAD 06:39	4h 56m	284	84%	0.0%	40 min
UA 264	SEA 23:20	IAD 07:22	5h 02m	67	91%	4.5%	197 min

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.


United	SEA	IAD	5h 07m	90%	0.8%	657	Flying now
Alaska	SEA	IAD	4h 58m	83%	0.4%	835	Flying now
Delta	SEA	IAD	5h 05m	77%	1.1%	361	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