MIAMI — Southwest Airlines began service to Mexico on Sunday, part of its second wave of international destinations. The cities of Cancun, and Los Cabos joined the list, both of which were inherited from AirTran Airways during their 2011 merger.

Service to Cancun is now offered from Hartsfield Jackson Atlanta International Airport and Baltimore/Washington Thurgood Washington International Airport (Both routes started on August 10th). The city will also receive service to Milwaukee in the form of a once weekly Saturday-only flight started on August 16th. Expansion will continue throughout the year as Southwest introduces service to Denver on October 7th, along with Austin and Chicago-Midway on November 2nd.

Los Cabos started receiving daily flights from Orange County International Airport on August 10th with additional service scheduled to Denver on October 11th, and Austin on November 2nd.

The recent international route expansion comes just over one month after Southwest Airlines began international service starting with Aruba, Montego Bay, Jamaica, and Nassau, Bahamas. Southwest will continue its international expansion by adding several key international destinations throughout the second half of 2014 such as Mexico City and Punta Cana. Like the Mexico routes that began this week, all of the carrier’s international destinations thus far have been former AirTran routes. Southwest will continue to assume its subsidiaries routes into 2015.

More international destinations to Latin America and the Caribbean will be announced as the merger with AirTran Airways is completed.