$561 Cheap Frontier Airlines flights Boston (BOS) to St. Louis (STL)

$561 Cheap Frontier Airlines flights Boston (BOS) to St. Louis (STL)

Prices were available within the past 7 days and start at $561 for one-way flights and $457 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Dec 23 - Wed, Dec 31

BOS

Boston

STL

St. Louis

$457 Roundtrip, found 1 day ago

$457

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Tue, Dec 23 from Boston to St. Louis, returning Wed, Dec 31, priced at $457 found 1 day ago

Tue, Dec 23 - Wed, Dec 24

BOS

Boston

STL

St. Louis

$532 Roundtrip, found 1 day ago

$532

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Tue, Dec 23 from Boston to St. Louis, returning Wed, Dec 24, priced at $532 found 1 day ago

Tue, Dec 23 - Mon, Dec 29

BOS

Boston

STL

St. Louis

$602 Roundtrip, found 1 day ago

$602

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Tue, Dec 23 from Boston to St. Louis, returning Mon, Dec 29, priced at $602 found 1 day ago