Southwest low fare calendar ＋１ ８４４ ６０４ ２９４４ best tool and technique that one can use to find out the best available flight deals on Southwest Airlines. You can also make a booking to get the best deals and also avoid unwanted trouble. With the help of a low-fare calendar, you will get the best deals on Tuesday, Wednesday, and Saturday in June. especially on Tuesday and Wednesday, tends to offer the lowest Southwest Airlines ticket prices.