https://www.devex.com/people/what-is-the-cheapest-day-to-book-flights-on-spirit-2475992https://www.devex.com/people/what-is-the-cheapest-day-to-book-flights-on-spirit-2475992https://www.devex.com/people/what-is-the-cheapest-day-to-book-flights-on-spirit-2475992https://www.devex.com/people/what-is-the-cheapest-day-to-book-flights-on-spirit-2475992https://www.devex.com/people/what-is-the-cheapest-day-to-book-flights-on-spirit-2475992https://www.devex.com/people/what-is-the-cheapest-day-to-book-flights-on-spirit-2475992https://www.devex.com/people/what-is-the-cheapest-day-to-book-flights-on-spirit-2475992https://www.devex.com/people/what-is-the-cheapest-day-to-book-flights-on-spirit-2475992https://www.devex.com/people/what-is-the-cheapest-day-to-book-flights-on-spirit-2475992