The best bet has a stop: Southwest via Denver (8h 32m) reaches San Diego on time 78% of the time, against 45% on the nonstop.
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).
Pick an hour to see this route’s flights leaving then.
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.
No Southwest flight on this route ran 150+ times in the year.
All 2 Southwest 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.
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.
| Southwest | BOS | SAN | 6h 10m | 46% | 3.4% | 58 | Flying now |
Alternatives with one stop
All connections →| SouthwestDetails → | BOS 06:25 → DEN 08:50WN 4156 | 1h 42m Denver | DEN 10:32 → SAN 12:00WN 1700 | 8h 32m | 98% | 78% |
| SouthwestDetails → | BOS 05:30 → BWI 07:05WN 727 | 2h 25m Baltimore | BWI 09:30 → SAN 11:45WN 1181 | 9h 15m | 95% | 61% |
| SouthwestDetails → | BOS 07:30 → MDW 09:10WN 745 | 58m Chicago | MDW 10:08 → SAN 12:15WN 4648 | 7h 46m | 90% | 51% |
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