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5,551 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

Leave before 9 am: 88% depart on time. After 4 pm it’s 3 in 4.

Best time to leave 10–11 pm 91% arrive on time from SEA
Best single flight UA 2618 SEA 07:00 → ORD 13:15 · 92% on time Avoid AS 429 SEA 10:29 → ORD 16:44 · 56% 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).

5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
SEA
91
89
85
79
71
71
63
72
68
77
74
83
74
% 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
Chicago flights leaving SEA 3–4 pm: 1Close ×
AA 2524 SEA 15:28 ORD 22:00 4h 32m 72 60% 4.2% 83 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 1,503 81% 0.9% 92 min
Delta 907 78% 1.2% 75 min
American 1,350 74% 1.9% 104 min
Alaska 1,791 74% 1.3% 58 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.
UA 2618 SEA 07:00 ORD 13:15 92%
UA 747 SEA 23:11 ORD 05:18 86%
DL 2055 SEA 07:20 ORD 13:30 85%
AS 328 SEA 00:17 ORD 06:20 83%
AS 538 SEA 17:48 ORD 23:59 80%
· · ·
DL 2108 SEA 17:40 ORD 23:39 76%
AS 410 SEA 13:10 ORD 19:21 72%
AS 429 SEA 10:29 ORD 16:44 56%
All 23 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 SEA ORD 4h 10m 81% 0.9% 1,503 Flying now
Delta SEA ORD 4h 10m 78% 1.2% 907 Flying now
American SEA ORD 4h 16m 74% 1.9% 1,350 Flying now
Alaska SEA ORD 4h 09m 74% 1.3% 1,791 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