$112 Find Cheap Southwest Flights from St. Louis to San Diego

When to Book Flights with Southwest from St. Louis to San Diego

• Is Southwest the cheapest airline to fly with from St. Louis to San Diego?

  With an average price of $484 return, Southwest is not the cheapest airline to fly from St. Louis to San Diego with. Instead, for the lowest price, our data suggests flying with Frontier, where a return flight costs $201 on average.

• What is the cheapest Southwest flight from St. Louis to San Diego?

  In the last 3 days, the lowest price for a flight with Southwest from St. Louis to San Diego was $257 for a return flight and $166 for a one-way flight.

• Does Southwest fly direct to San Diego from St. Louis?

  Yes, Southwest does offer direct flights for the route, with around 10 flights per week.

• What’s the cheapest day of the week to fly from St. Louis to San Diego with Southwest?

  On average, the cheapest day of the week to fly from St. Louis to San Diego with Southwest is Monday, when prices are around $138. The most expensive day is generally Saturday, where the average price is around $195.

• What’s the cheapest month to fly from St. Louis to San Diego with Southwest?

  The cheapest month for Southwest flights to San Diego from St. Louis is generally August, where plane tickets cost $206 on average. If possible, try to avoid the most expensive months of June and January, where tickets cost $430 and $503 respectively.