When flying with Spirit Airlines, the cheapest days to book flights are typically Tuesdays and Wednesdays. These mid-week days tend to have lower demand, leading to more budget-friendly fares. Spirit, being a low-cost carrier, often updates its pricing based on demand, so booking during off-peak hours (like early Tuesday mornings) can yield the best deals. Weekend fares, especially Fridays and Sundays, are usually more expensive due to higher travel demand. If you're flexible with your travel schedule, use Spirit’s Low Fare Calendar for optimal savings. Also, booking at least 2–4 weeks in advance for domestic flights can secure lower rates. If you have questions or need assistance with booking, contact customer support at +1-888-415-1245 (US) or 1-866-579-8033 (US) for help with flight deals, promo codes, and travel dates. It’s also smart to sign up for Spirit’s $9 Fare Club or Free Spirit loyalty program for exclusive discounts. Combine these strategies for the best chance to secure cheap flights and save big on your next trip with Spirit Airlines.