$154 Find Cheap Southwest Flights from Boston to St. Louis

When to Book Flights with Southwest from Boston to St. Louis

• How far in advance should I book tickets for a flight with Southwest from Boston to St. Louis?

  Generally, when trying to get a below average price for your ticket, try to book around 17 days before departure. For the cheapest possible price, our data suggests booking 27 days before departure.

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

  With an average price of $466 return, Southwest is not the cheapest airline to fly from Boston to St. Louis with. Instead, for the lowest price, our data suggests flying with Spirit Airlines, where a return flight costs $186 on average.

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

  In the last 3 days, the lowest price for a flight with Southwest from Boston to St. Louis was $190 for a return flight and $118 for a one-way flight.

• Does Southwest fly direct to St. Louis from Boston?

  Yes, Southwest does offer direct flights for the route, with around 2 flights per week.

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

  On average, the cheapest day of the week to fly from Boston to St. Louis with Southwest is Monday, when prices are around $151. The most expensive day is generally Saturday, where the average price is around $216.

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

  The cheapest month for Southwest flights to St. Louis from Boston is generally February, where plane tickets cost $210 on average. If possible, try to avoid the most expensive months of October and January, where tickets cost $422 and $495 respectively.