$79 Find Cheap Southwest Flights from Ontario to Denver

When to Book Flights with Southwest from Ontario to Denver

• Is Southwest the cheapest airline to fly with from Ontario to Denver?

  With an average price of $260 return, Southwest is not the cheapest airline to fly from Ontario to Denver with. Instead, for the lowest price, our data suggests flying with Frontier, where a return flight costs $138 on average.

• What is the cheapest Southwest flight from Ontario to Denver?

  In the last 3 days, the lowest price for a flight with Southwest from Ontario to Denver was $117 for a return flight and $77 for a one-way flight.

• Does Southwest fly direct to Denver from Ontario?

  Yes, Southwest does offer direct flights for the route, with around 19 flights per week.

• What’s the cheapest day of the week to fly from Ontario to Denver with Southwest?

  On average, the cheapest day of the week to fly from Ontario to Denver with Southwest is Sunday, when prices are around $48. The most expensive day is generally Saturday, where the average price is around $98.

• What’s the cheapest month to fly from Ontario to Denver with Southwest?

  The cheapest month for Southwest flights to Denver from Ontario is generally April, where plane tickets cost $88 on average. If possible, try to avoid the most expensive months of December and January, where tickets cost $209 and $514 respectively.