Southwest Airlines Low Fare Calendar September 2026 Schedule Assessment Overview
Southwest Airlines Low Fare Calendar September 2026 Schedule Assessment Overview. That means you can now book some fall flights now. The next extension will be on on may 8th, 2025, and it will open the schedule through january 26, 2026.

Keep in mind that our basic fare comes with more restrictions than our other fares. Visit southwest.com to view the southwest low fare calendar and find the cheapest airfare of the season. Here are the details you’ll need to book those remaining flights you’ve considered for 2025 or the first week of 2026.