Southwest Airlines weighs relocation to Boeing Field.

Jun. 15--Low-fare giant Southwest Airlines, upset about the skyrocketing cost of flying out of Seattle-Tacoma International Airport, is considering moving its Seattle operations to Boeing Field.

Southwest has been quietly talking with county officials for more than a year about flying out of King County International Airport, as Boeing Field is officially known. The discussions reached the point that it was time to inform the County Council and the public of a possible agreement, County Executive Ron Sims said yesterday.

The nation's biggest domestic carrier, Southwest has made an art of keeping its costs low by avoiding premium-priced airports and flying out of second-tier locations, such as Oakland instead of San …