Yes, in 2026, most major airline companion tickets do work for Hawaii, but the rules vary significantly by carrier. The Alaska Airlines Famous Companion Fare is a traveler favorite because it has no "blackout" dates or limited inventory; as long as two seats are available in Economy, you can use the code to bring a companion for $99 (plus taxes/fees) to any Hawaii destination Alaska flies. Hawaiian Airlines offers a one-time 50% discount for companions to cardholders, which is specifically designed for mainland-to-island routes. For Southwest Companion Pass holders, Hawaii is fully included; you can fly a companion for just the cost of taxes (about $5.60) as many times as you like. However, Delta and American Airlines companion certificates often have more "fine print"—they are typically restricted to flights within the 48 contiguous United States, though some higher-tier credit cards may include Hawaii as an exception. Always check your specific certificate's "Terms and Conditions" in your airline app before booking, as some may exclude "Basic Economy" or require specific fare classes to be available.