$140 Cheap Frontier Airlines flights St. Louis (STL) to Boston (BOS)

$140 Cheap Frontier Airlines flights St. Louis (STL) to Boston (BOS)

Prices were available within the past 7 days and start at $140 for one-way flights and $220 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Aug 4 - Tue, Aug 11

STL

St. Louis

BOS

Boston

$220 Roundtrip, found 4 days ago

$220

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Tue, Aug 4 from St. Louis to Boston, returning Tue, Aug 11, priced at $220 found 4 days ago

Tue, Aug 11 - Sat, Aug 15

STL

St. Louis

BOS

Boston

$235 Roundtrip, found 1 day ago

$235

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Tue, Aug 11 from St. Louis to Boston, returning Sat, Aug 15, priced at $235 found 1 day ago

Tue, Aug 11 - Thu, Aug 20

STL

St. Louis

BOS

Boston

$244 Roundtrip, found 1 day ago

$244

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Tue, Aug 11 from St. Louis to Boston, returning Thu, Aug 20, priced at $244 found 1 day ago

Thu, Aug 6 - Tue, Aug 11

STL

St. Louis

BOS

Boston

$248 Roundtrip, found 4 days ago

$248

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Thu, Aug 6 from St. Louis to Boston, returning Tue, Aug 11, priced at $248 found 4 days ago

Tue, Aug 11 - Fri, Aug 21

STL

St. Louis

BOS

Boston

$250 Roundtrip, found 1 day ago

$250

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Tue, Aug 11 from St. Louis to Boston, returning Fri, Aug 21, priced at $250 found 1 day ago

Tue, Aug 4 - Mon, Aug 17

STL

St. Louis

BOS

Boston

$259 Roundtrip, found 4 days ago

$259

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Tue, Aug 4 from St. Louis to Boston, returning Mon, Aug 17, priced at $259 found 4 days ago

Sat, Aug 15 - Thu, Sep 3

STL

St. Louis

BOS

Boston

$263 Roundtrip, found 4 days ago

$263

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Sat, Aug 15 from St. Louis to Boston, returning Thu, Sep 3, priced at $263 found 4 days ago

Sat, Aug 15 - Fri, Aug 21

STL

St. Louis

BOS

Boston

$265 Roundtrip, found 1 day ago

$265

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sat, Aug 15 from St. Louis to Boston, returning Fri, Aug 21, priced at $265 found 1 day ago