Southwest Airlines and LOT Polish Airlines have launched a new interline partnership, giving travellers more options to connect between Southwest’s U.S. network and destinations across Europe and beyond. The agreement began on September 1, 2026.
Under the partnership, customers can book itineraries combining flights operated by both airlines through LOT Polish Airlines, travel agents and online travel websites. The arrangement expands Southwest’s reach into international markets by connecting its network with LOT’s Warsaw-based European and long-haul services.
The partnership also allows connecting passengers to travel on a single itinerary, with interline arrangements supporting features such as through-checked baggage and smoother connections between the two carriers.