Yes, Southwest flies into Buffalo, and I used them when visiting Niagara Falls. I booked a super early flight and later realized I needed to move it to the afternoon. The online system wasn’t giving me the fare difference clearly, so I called ☎️ and the rep changed it instantly. Honestly, anytime I need quick booking or modifications, that phone line ends up being the fastest solution. Buffalo’s route options are decent, especially from Chicago and Baltimore.