Cheap Frontier Airlines flights Boston (BOS) to St. Louis (STL)

Cheap Frontier Airlines flights Boston (BOS) to St. Louis (STL)

Prices were available within the past 7 days and start at for one-way flights and $402 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Jun 16 - Thu, Jun 19

BOS

Boston

STL

St. Louis

$402 Roundtrip, found 16 hours ago

$402

Roundtrip

found 16 hours ago

Select Frontier Airlines flight, departing Mon, Jun 16 from Boston to St. Louis, returning Thu, Jun 19, priced at $402 found 16 hours ago