$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 $280 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Apr 9 - Sun, Apr 12

STL

St. Louis

BOS

Boston

$280 Roundtrip, found 18 hours ago

$280

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Thu, Apr 9 from St. Louis to Boston, returning Sun, Apr 12, priced at $280 found 18 hours ago

Thu, Apr 9 - Tue, Apr 14

STL

St. Louis

BOS

Boston

$336 Roundtrip, found 18 hours ago

$336

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Thu, Apr 9 from St. Louis to Boston, returning Tue, Apr 14, priced at $336 found 18 hours ago

Thu, Apr 9 - Sat, Apr 11

STL

St. Louis

BOS

Boston

$395 Roundtrip, found 18 hours ago

$395

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Thu, Apr 9 from St. Louis to Boston, returning Sat, Apr 11, priced at $395 found 18 hours ago

Thu, Apr 9 - Thu, Apr 16

STL

St. Louis

BOS

Boston

$445 Roundtrip, found 18 hours ago

$445

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Thu, Apr 9 from St. Louis to Boston, returning Thu, Apr 16, priced at $445 found 18 hours ago

Thu, Apr 9 - Sat, Apr 11

STL

St. Louis

BOS

Boston

$514 Roundtrip, found 18 hours ago

$514

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Thu, Apr 9 from St. Louis to Boston, returning Sat, Apr 11, priced at $514 found 18 hours ago

Thu, Apr 9 - Mon, Apr 20

STL

St. Louis

BOS

Boston

$564 Roundtrip, found 18 hours ago

$564

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Thu, Apr 9 from St. Louis to Boston, returning Mon, Apr 20, priced at $564 found 18 hours ago

Thu, Apr 9 - Sat, Apr 11

STL

St. Louis

BOS

Boston

$598 Roundtrip, found 18 hours ago

$598

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Thu, Apr 9 from St. Louis to Boston, returning Sat, Apr 11, priced at $598 found 18 hours ago

Thu, Apr 9 - Sat, Apr 11

STL

St. Louis

BOS

Boston

$603 Roundtrip, found 18 hours ago

$603

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Thu, Apr 9 from St. Louis to Boston, returning Sat, Apr 11, priced at $603 found 18 hours ago

Thu, Apr 9 - Fri, Apr 17

STL

St. Louis

BOS

Boston

$674 Roundtrip, found 18 hours ago

$674

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Thu, Apr 9 from St. Louis to Boston, returning Fri, Apr 17, priced at $674 found 18 hours ago