Southwest & Singapore Airlines Join Hands For A New Partnership

June 9, 2026

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Singapore Airlines – Southwest Interline Partnership
Southwest Making Moves
What This New Partnership Isn’t
The Pundit’s Mantra
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Southwest has added another international partner.. As per Travel Weekly, Southwest has begun an interline partnership with Singapore Airlines, allowing international travelers to connect between Singapore Airlines and nearly 120 airports in Southwest’s network through shared gateways in Los Angeles, Seattle and San Francisco. For Southwest, this is another sign that the airline is slowly moving away from being the purely domestic, self-contained carrier many travelers have known for decades.

Singapore Airlines – Southwest Interline Partnership

The new partnership lets travelers book a single itinerary involving Singapore Airlines and Southwest. Tickets can be purchased through travel advisors, travel websites and Singapore Airlines’ direct channels. However, they are not available through Southwest’s own direct channels, which is an important limitation.

In practical terms, this is useful for travelers flying Singapore Airlines into the U.S. and then connecting onward to smaller or secondary American cities served by Southwest. Instead of booking separate tickets and hoping everything works, travelers can now book a more coordinated itinerary. That is especially helpful because Southwest has a large domestic network, but historically limited international partnership connectivity.

Southwest Making Moves

Singapore Airlines is now Southwest’s eighth interline partner since early last year, joining carriers such as Turkish Airlines, Icelandair and All Nippon Airways. That tells you where Southwest is heading. The airline does not need to fly widebody aircraft to Asia or Europe to become more relevant internationally. It can instead use partners to feed traffic into its domestic network. This also gives international airlines more access to U.S. cities where Southwest is strong.

What This New Partnership Isn’t

An interline partnership is not the same thing as a full frequent flyer partnership. Based on the current details, this appears to be about connectivity and ticketing, not a major loyalty tie-up. So I would not assume meaningful Rapid Rewards earning, redemption or elite benefits with Singapore Airlines unless the airlines announce that separately. For now, the real benefit is convenience.

The Pundit’s Mantra

I like this move by Southwest. Singapore Airlines is one of the strongest airline brands in the world. For Southwest to connect into that network through Los Angeles, Seattle and San Francisco gives it more international relevance without dramatically changing its own operation. That said, this is still a modest partnership from a miles and points perspective.

The biggest limitation is that these itineraries are not bookable directly through Southwest. That makes the partnership less visible to everyday Southwest customers. However, Southwest is slowly becoming a more conventional airline. Assigned seats, more partners, broader distribution and now more international connectivity. For longtime Southwest loyalists, that may feel strange.

However, for travelers who want easier connections between Asia and smaller U.S. cities, this is a useful development.

What do you think about this new tie up between Singapore Airlines and Southwest? Tell us in the comments section.

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