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1,851 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

No clear winner: airlines and hours on this route all land within a few points of 4 in 5 on time.

Best time to leave 6–7 am 92% arrive on time from IAD
Best single flight AS 351 IAD 06:00 → SEA 08:46 · 79% on time Avoid UA 326 IAD 17:55 → SEA 20:46 · 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).

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IAD
93
86
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93
83
72
68
% 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
Seattle flights leaving IAD 6–7 am: 2Close ×
AS 351 IAD 06:00 SEA 08:46 5h 46m 275 79% 0.7% 51 min
AS 409 IAD 06:03 SEA 08:48 5h 45m 113 63% 1.8% 49 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.
United 655 81% 0.6% 62 min
Delta 361 78% 1.4% 98 min
Alaska 835 76% 1.2% 50 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 351 IAD 06:00 SEA 08:46 79%
DL 1015 IAD 07:00 SEA 09:45 79%
UA 326 IAD 17:55 SEA 20:46 77%
All 9 flights on this route →

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 IAD SEA 5h 51m 81% 0.6% 655 Flying now
Delta IAD SEA 5h 57m 78% 1.4% 361 Flying now
Alaska IAD SEA 5h 46m 76% 1.2% 835 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