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3,869 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 10–11 pm 93% arrive on time from SAN
Best single flight AA 518 SAN 06:15 → ORD 12:47 · 89% on time Avoid AS 1478 SAN 12:40 → ORD 18:57 · 61% 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
14
15
16
17
18
19
20
21
22
SAN
93
88
84
76
86
95
74
61
81
65
73
74
90
% 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 SAN 12–1 pm: 1Close ×
AS 1478 SAN 12:40 ORD 18:57 4h 17m 188 61% 3.2% 58 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 1,673 82% 0.5% 83 min
American 1,389 79% 1.7% 94 min
Alaska 777 72% 2.3% 63 min
Frontier 30 – 3.3% 146 min

Dimmed: fewer than 150 flights in the year, too few to rank.

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.
AA 518 SAN 06:15 ORD 12:47 89%
UA 2486 SAN 16:41 ORD 22:59 82%
UA 1710 SAN 10:35 ORD 16:52 82%
AS 1493 SAN 17:23 ORD 23:36 70%
UA 1779 SAN 14:00 ORD 20:20 70%
· · ·
AS 1478 SAN 12:40 ORD 18:57 61%
All 15 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 SAN ORD 4h 15m 82% 0.5% 1,673 Flying now
American SAN ORD 4h 19m 79% 1.7% 1,389 Flying now
Alaska SAN ORD 4h 21m 72% 2.3% 777 Flying now
Frontier SAN ORD 4h 23m 55%few flights 3.3% 30 Not 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