Southwest Airlines' popular three-day sale now underway! Fly for cheap this summer or fall

MILWAUKEE -- Looking to book a late summer (or fall) vacation? Southwest Airlines is offering a three-day sale! You can "get up and go" with one-way flights as low as $49, $79, $99 and $129, according to Southwest.com.

IMPORTANT NOTE: You must book by June 9th for:

Below are three-day sale options out of Milwaukee, starting at $49 one way:

CLICK HERE for flights out of Milwaukee.

CLICK HERE to check prices on flights out of Chicago included in this three-day sale.