Southwest Airlines

WN1666Ontario to Denver

Name: Southwest Airlines WN1666 Ontario to Denver: on-time record
Creator: TripStow
License: https://tripstow.com/notices

Southwest Airlines flight WN1666 flies from Ontario (ONT) to Denver (DEN), 1,316 km. Over August 2025 to July 2026 it usually arrives about 8 minutes late: 73% of 346 flights arrived within 15 minutes of schedule and 1.4% were cancelled (US Department of Transportation data).

On-time record, last 12 months

73%

on time (within 15 min)

14%

more than 30 min late

1.4%

cancelled

+8 min

average arrival vs schedule

Every operation of WN1666, August 2025 to July 2026: 346 flights. Source: US Bureau of Transportation Statistics, public domain.

Routes flown as WN1666

Ontario (ONT) to Denver (DEN)58 flights
Seattle Tacoma (SEA) to Chicago Midway (MDW)57 flights
Denver (DEN) to Tulsa (TUL)50 flights
Denver (DEN) to San Antonio (SAT)45 flights
Jacksonville (JAX) to Baltimore (BWI)32 flights
Burbank (BUR) to Phoenix Sky Harbor (PHX)31 flights
Baltimore (BWI) to Denver (DEN)18 flights
Phoenix Sky Harbor (PHX) to Ontario (ONT)18 flights
Baltimore (BWI) to Austin Bergstrom (AUS)16 flights
Denver (DEN) to San Jose (SJC)16 flights

Other flights from Ontario to Denver

WN113 WN1177 WN1229 WN1317 WN1594 WN1642 WN1655 WN1989 WN2191 WN2220 WN2310 UA1263

More about Ontario (ONT) and Denver (DEN).

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