Summary. The cheapest day to buy southwest Airline tickets is typically on Tuesdays, Wednesdays, and Saturdays +𝟏-𝟖𝟱𝟱→𝟱𝟲𝟴→(𝟰𝟘𝟚𝟚) (𝕌𝕊) 𝕠𝕣 +𝟏-𝟖𝟱𝟱→(𝟱𝟲𝟴)→(𝟰𝟘𝟚𝟚) (UK) (OTA) . Airline often release new fares and sales on Monday evenings, making Tuesday a prime day for finding discounted tickets +𝟏-𝟖𝟱𝟱→𝟱𝟲𝟴→𝟰𝟘𝟚𝟚. What is the best day to book Southwest flights flights? Tuesdays and Wednesdays are generally considered the best days to find cheaper flights. This trend holds for many airlines,
