A woman browsing flight deals. Credit: Margot Cavin/Travel + Leisure Key Points Flexibility with travel dates, destinations, and airports can lead to more affordable last-minute flights.Use price alerts and deal services to stay informed about airfare drops on desired travel dates.Booking flights on Tuesdays or flying on Thursdays could help in securing cheaper ticket prices. Airfare is often one of the biggest trip expenses, but fortunately, there are still ways to save, even when booking at the last minute. But before reading on, it's important to define what we mean when we say "last minute." Generally, explains Melanie Fish, head of Expedia Group Brands public relations, "We think of last-minute as booking zero to six days from departure." Additionally, while booking a last-minute flight can be stressful and expensive, Fish tells Travel + Leisure that "there are some strategies you can use to find cheaper fares." Kyle Maltz, COO and partner at Dollar Flight Club, a travel membership service that saves…