If you’re looking to travel by plane in the upcoming months you may want to check out the nationwide airfare sale that Southwest has just kicked-off.

The airline is pricing flights based on mileage. Here is a breakdown of the fares:

Flights of up to 450 miles are $30
Fly 451-1000 miles and pay $60
Fly 1001-1500 miles and pay $90
Fly 1501 + miles and pay $120

The fares are one-way, and are available for online purchase today through 11:59 p.m. PDT Oct. 28, 2010. They are good for travel every day except Sundays between Dec. 1, 2010, and Dec. 15, 2010, and between Jan. 4, 2011, and Feb. 16, 2011.

To make a reservation visit: www.southwest.com

Again, this is a nationwide sale, but here is an idea of what fares you’ll find out of Philadelphia – $30 one-way to Boston, Buffalo, Cleveland, Columbus, Pittsburgh or Providence. $60 one-way to Chicago, Detroit, and Nashville. $90 one-way to Austin, Dallas and Houston. $120 one-way to Denver, Las Vegas, San Diego and San Francisco.

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