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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).

6
7
8
9
10
11
12
13
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15
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19
IAD
93
86
95
91
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

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 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 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.
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
DL 1015 IAD 07:00 SEA 09:45 5h 45m 349 79% 1.1% 102 min
UA 2101 IAD 09:00 SEA 11:51 5h 51m 82 91% 0.0% 43 min
AS 375 IAD 09:00 SEA 11:45 5h 45m 134 90% 0.0% 33 min
AS 361 IAD 09:30 SEA 12:16 5h 46m 52 90% 1.9% 45 min
UA 2241 IAD 13:10 SEA 15:55 5h 45m 72 86% 0.0% 128 min
UA 326 IAD 17:55 SEA 20:46 5h 51m 277 77% 0.7% 64 min
AS 737 IAD 18:14 SEA 21:09 5h 55m 129 58% 1.6% 55 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 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