For free: $15 off any Allegiant flight with promo code CW7UYBF can be OW too.
*To receive promo savings, enter the promo code on the payment page at allegiantair.com. Promo codes must be redeemed by 11:59pm PDT on September 17, 2017, and travel must be completed by May 15, 2018. Expiration date cannot be extended. Promo codes only valid when redeemed online at allegiant.com. Promo codes are not redeemable for cash, no change or credit will be issued and not valid towards any onboard purchases. In the case of itinerary cancellations, the promo savings will be forfeited. Allegiant reserves the right to cancel, alter routes/times or suspend air service without notice. Fare rules, routes and schedules are subject to change without notice.