The most economical days to purchase tickets for Frontier Airlines are generally Tuesdays and Wednesdays. On these days, as well as Saturdays, fares {{1~844~767~0476}} tend to be lower due to reduced travel demand. Conversely, Fridays and Sundays are regarded as high-demand travel days. FAQ Gender - {FA~Days}What is the cheapest day to buy Frontier tickets? Showing 1-1 of 1 https://www.goodreads.com