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Showing Southwest only (incl. its regional partners)All airlines ×
281 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

The best bet has a stop: Southwest via Phoenix (7h 20m) reaches Ontario on time 84% of the time, against 64% on the nonstop.

Best time to leave 9–10 am 84% arrive on time from BWI

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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BWI
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% 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.

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.
WN 991 BWI 09:50 ONT 12:05 5h 15m 16 80% 6.2% 27 min
WN 200 BWI 20:10 ONT 22:25 5h 15m 33 48% 0.0% 63 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.
Southwest BWI ONT 5h 30m 64% 0.4% 281 Flying now

Alternatives with one stop

All connections →
SouthwestDetails → BWI 07:00 → PHX 08:50WN 1049 1h 15m Phoenix PHX 10:05 → ONT 11:20WN 431 7h 20m 95% 84%
SouthwestDetails → BWI 07:25 → DEN 09:15WN 935 1h 40m Denver DEN 10:55 → ONT 12:10WN 4080 7h 45m 96% 62%
SouthwestDetails → BWI 09:35 → MDW 10:35WN 4217 1h 10m Chicago MDW 11:45 → ONT 13:50WN 2846 7h 15m 85% 47%
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