Southwest said in a news release that the two airlines unveiled the deal June 8 at the International Air Transport Association's annual meeting in Rio de Janeiro. The arrangement lets travelers buy one combined itinerary instead of booking each leg separately, connecting at three shared U.S. West Coast gateways the carrier named as Los Angeles International Airport, Seattle-Tacoma International Airport and San Francisco International Airport, Channel News Asia reported.
From those hubs, Singapore Airlines customers can connect onward to the roughly 120 destinations Southwest serves but the Singapore Airlines does not reach directly, the company said, from Knoxville, Tennessee, to Anchorage, Alaska, both among the five U.S. airports Southwest began serving in 2026.
For travelers in Vietnam and Southeast Asia, the practical payoff runs through Changi. Singapore Airlines flies daily from Ho Chi Minh City and Hanoi to Singapore, and its budget arm Scoot serves Da Nang, Nha Trang and Phu Quoc, according to the carriers' published schedules. A passenger leaving Tan Son Nhat can now, in principle, hold a single reservation through Changi and a West Coast gateway to a Southwest city that no carrier previously offered on one ticket.
