Cheap United flights St. Louis (STL) to Boston (BOS)

Cheap United flights St. Louis (STL) to Boston (BOS)

Prices were available within the past 7 days and start at for one-way flights and $646 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Sun, Sep 13 - Thu, Sep 17

STL

St. Louis

BOS

Boston

$646 Roundtrip, found 17 hours ago

$646

Roundtrip

found 17 hours ago

Select United flight, departing Sun, Sep 13 from St. Louis to Boston, returning Thu, Sep 17, priced at $646 found 17 hours ago