Don't go anywhere without these 6 Alamo coupons and promo codes for April April. Whether you're looking for a free upgrade or multi-day discount, these coupon codes are sure to get you the savings you need before you head out. When you need a reliable rental car, look no further than Alamo. Their massive fleet is filled with a wide variety of vehicles that are ideal for everything from a short business trip to a cross-country family vacation.