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Southwest Airlines and Singapore Airlines Announce Interline Partnership to Connect 120 U.S. Cities
Southwest Airlines and Singapore Airlines have just inked a deal that could make crossing the Pacific as simple as a single tap. On June 10, 2026, the two carriers announced an interline partnership that lets passengers book one ticket that covers flights on both airlines. The agreement, set to take effect in 2026, spans almost 120 U.S. cities served by Southwest and is accessed through three major West Coast gateways.
For travelers, the new arrangement means a single check‑in and baggage transfer between the two carriers, with no extra handling fees. If a connection is missed, the partnership guarantees free rebooking on the next available flight—an advantage that disappears when itineraries require separate tickets. Bookings can be made through Singapore Airlines’ website, travel agents, and other online travel platforms that support interline tickets, and the airlines will issue electronic tickets for itineraries that include the other carrier.
Southwest, headquartered in Dallas, Texas, is the fourth‑largest U.S. airline by passengers carried as of 2024. The carrier operates an all‑Boeing 737 fleet and serves more than 100 destinations across 42 states, Washington, D.C., Puerto Rico, and several Caribbean locations. In 2026, Southwest will add service to St. Thomas, Sint Maarten, Santa Rosa/Sonoma County, Knoxville, and Anchorage. The interline partnership adds a new dimension to Southwest’s strategy of connecting U.S. travelers with international destinations through its growing network of foreign partners.
Singapore Airlines, the flag carrier of Singapore, operates a global network that includes more than 160 aircraft and serves destinations in Asia, Europe, North America, and beyond. The airline is a member of Star Alliance and has earned a reputation for high service quality. By partnering with Southwest, Singapore Airlines gains a seamless gateway into the U.S. domestic market, allowing passengers from Singapore to reach almost 120 U.S. cities on a single ticket. The partnership also provides Singapore Airlines customers with access to Southwest’s extensive network of regional and domestic routes.
Interlining differs from codeshare agreements in that it focuses on ticketing and baggage handling rather than flight marketing. The bilateral agreement between Southwest and Singapore Airlines enables both carriers to issue electronic tickets for itineraries that include the other airline, a capability that is increasingly important as airlines seek to simplify travel for passengers. Southwest’s current list of foreign partners includes China Airlines, Condor, EVA Air, Icelandair, Philippine Airlines, Turkish Airlines, and All Nippon Airways, making Singapore Airlines its eighth foreign partner.
The partnership is expected to begin service in 2026 and will be available to passengers booking through standard distribution channels. Both airlines have indicated that the agreement will enhance connectivity for travelers and support their respective growth strategies. While the partnership does not involve a merger or alliance membership, it represents a significant step in expanding cross‑border travel options. Future developments may include additional gateways or expanded service to other U.S. cities as the partnership matures.
For travelers, the new arrangement means a single check‑in and baggage transfer between the two carriers, with no extra handling fees. If a connection is missed, the partnership guarantees free rebooking on the next available flight—an advantage that disappears when itineraries require separate tickets. Bookings can be made through Singapore Airlines’ website, travel agents, and other online travel platforms that support interline tickets, and the airlines will issue electronic tickets for itineraries that include the other carrier.
Southwest, headquartered in Dallas, Texas, is the fourth‑largest U.S. airline by passengers carried as of 2024. The carrier operates an all‑Boeing 737 fleet and serves more than 100 destinations across 42 states, Washington, D.C., Puerto Rico, and several Caribbean locations. In 2026, Southwest will add service to St. Thomas, Sint Maarten, Santa Rosa/Sonoma County, Knoxville, and Anchorage. The interline partnership adds a new dimension to Southwest’s strategy of connecting U.S. travelers with international destinations through its growing network of foreign partners.
Singapore Airlines, the flag carrier of Singapore, operates a global network that includes more than 160 aircraft and serves destinations in Asia, Europe, North America, and beyond. The airline is a member of Star Alliance and has earned a reputation for high service quality. By partnering with Southwest, Singapore Airlines gains a seamless gateway into the U.S. domestic market, allowing passengers from Singapore to reach almost 120 U.S. cities on a single ticket. The partnership also provides Singapore Airlines customers with access to Southwest’s extensive network of regional and domestic routes.
Interlining differs from codeshare agreements in that it focuses on ticketing and baggage handling rather than flight marketing. The bilateral agreement between Southwest and Singapore Airlines enables both carriers to issue electronic tickets for itineraries that include the other airline, a capability that is increasingly important as airlines seek to simplify travel for passengers. Southwest’s current list of foreign partners includes China Airlines, Condor, EVA Air, Icelandair, Philippine Airlines, Turkish Airlines, and All Nippon Airways, making Singapore Airlines its eighth foreign partner.
The partnership is expected to begin service in 2026 and will be available to passengers booking through standard distribution channels. Both airlines have indicated that the agreement will enhance connectivity for travelers and support their respective growth strategies. While the partnership does not involve a merger or alliance membership, it represents a significant step in expanding cross‑border travel options. Future developments may include additional gateways or expanded service to other U.S. cities as the partnership matures.
