Southwest Airlines is preparing its largest flight schedule in the carrier’s history for the upcoming summer season, staking out a massive expansion centered heavily on Austin, Nashville, and San Diego. The Dallas-based low-cost carrier officially announced an expansive 11-route network addition that introduces exciting new international service to Costa Rica, Turks and Caicos, and the Bahamas, while also restoring several long-dormant or seasonal domestic connections.
Out of the 11 newly announced routes, nine represent brand-new destinations that Southwest has never operated before. As part of this comprehensive summer route drop, the airline is strategically linking several key operational hubs and focus cities to high-demand vacation and business markets, reinforcing its competitive posture in some of the fastest-growing aviation sub-markets in the United States.
Austin-Bergstrom International Airport (AUS) emerged as the single biggest winner in the latest scheduling update. The Texas capital airport will secure a total of seven completely new or returning routes launching at the beginning of June. Southwest is leveraging its strong local presence in Austin to establish direct international links to three prominent destinations in Central America and the Caribbean, alongside a series of domestic additions tailored to summer leisure and family travel.
Meanwhile, Nashville International Airport (BNA) is also capturing a substantial share of the airline’s summer growth strategy, picking up two new island getaways alongside additional domestic connectivity. On the West Coast, San Diego International Airport (SAN) is slated to receive new direct service to the Deep South, paired with an influx of increased frequencies on a host of existing routes.
Southwest’s New and Returning Routes
The freshly minted service lines are scheduled to operate during the peak summer travel window, running between June 3 and August 2, 2027. This schedule alignment aims to capture the surge in vacation travel demand typical of the mid-summer months.
Leading the charge in Austin, Southwest will introduce weekend service to Guanacaste Airport (LIR) in Liberia, Costa Rica, opening up a major international eco-tourism market for Texas travelers. Similarly, the airline will launch weekend service from Austin to Lynden Pindling International Airport (NAS) in Nassau, Bahamas, and Punta Cana International Airport (PUJ) in the Dominican Republic.
In addition to these tropical international getaways, Austin will welcome back daily seasonal service to Portland International Airport (PDX), a route that has remained dormant since it was last flown in 2018. Austin travelers will also gain seasonal Saturday service to Sarasota Bradenton International Airport (SRQ) in Florida, last operated in 2023, alongside new weekend service to Savannah/Hilton Head International Airport (SAV) in Georgia and Saturday service to Bozeman Yellowstone Airport (BZN) in Montana.
Nashville International Airport is similarly expanding its international and domestic footprint for the summer season. BNA will receive two major brand-new routes to island destinations: direct service to Nassau, Bahamas, and Howard Hamilton Providenciales Airport (PLS) in Turks and Caicos. Additionally, Nashville will gain a new domestic route connecting the Tennessee hub to Boise Airport (BOI) in Idaho. This adds to Southwest’s broader network reinforcement in the region, which also includes the official return of seasonal service from Nashville to Bozeman, Montana, matching operations previously flown in the summer of 2026.
Out west, San Diego International Airport is securing new seasonal Sunday service to Will Rogers International Airport (OKC) in Oklahoma City. To complement this addition, Southwest is officially bringing back its popular seasonal offerings from San Diego to Bozeman, Montana, as well as to Pittsburgh and Columbus, Ohio, giving West Coast travelers seamless access to the Northern Rockies and the industrial Midwest.
Doubling Down on Austin and Nashville
The sheer volume of new flights underscores Southwest’s aggressive capacity deployment in its primary focus cities. In Austin, the carrier expects to operate its largest-ever flight schedule during the peak of next summer, boasting an impressive total of approximately 143 departures on peak travel days.
This ambitious expansion in the Texas capital comes amid intensifying competition. Delta Air Lines has been steadily ramping up its own route network at Austin-Bergstrom International Airport, having designated the facility as one of its prominent strategic focus cities. Despite the influx of rival carrier capacity and aggressive market positioning from legacy competitors, Southwest continues to maintain its standing as the clear market share leader at AUS, commanding a dominant position that this latest round of route additions aims to preserve and extend.
Concurrently, Southwest is planning as many as 220 daily flights out of Nashville International Airport next summer, cementing BNA’s status as one of the airline’s most vital and high-frequency operational bases in the eastern half of the country.
The heavy concentration of flight growth in Austin and Nashville is far from coincidental. Both airports are currently serving as major focal points for Southwest’s broader infrastructural investments, including ongoing construction projects to build the airline’s inaugural branded airport lounges. As these dedicated passenger lounges move closer to reality alongside these record-breaking flight schedules, Southwest is clearly signalling a long-term commitment to elevating the passenger experience and solidifying its operational stronghold in these two crucial metropolitan markets.
