Southwest has begun an interline partnership with Singapore Airlines.
International travelers can now connect between Singapore and nearly 120 airports in the Southwest network via the carriers' share stations in Los Angeles, Seattle and San Francisco.
Single itinerary tickets can be purchased through travel advisors, travel websites and Singapore Airlines' direct channels, but not via direct Southwest channels.
Singapore Airlines is now the eighth interline partner Southwest has acquired since early last year, joining Turkish Airlines, Icelandair and All Nippon Airways, among others.