When Does Southwest Release Flights For December 2025. Here’s how to be a flight booking pro and discover the optimal moments to snap up those coveted low fares. The airline said on thursday that its passengers will be able to book a reserved seat in late 2025 and those seats will start to become available on flights in early 2026.

The southwest flights schedule is now open for booking through august 4, 2025. On december 12, 2024, we will open our schedule for sale through october 1, 2025.