In the commercial and advertising world, Warburton is the voice in the Carrier Corporation commercials for their air-conditioning and HVAC units, and was the voice of Superman in The Adventures of Seinfeld and Superman for American Express. He is the voice of "Lewis" in the "Clark & Lewis Expedition" radio commercials for Horizon Air. In August 2009, Warburton played a high-end PC in a "Get a Mac" ad for Apple Inc. Warburton became the spokesman for Japanese automaker Honda's "Good Reasons" advertising campaign in September 2011. He is the voice in NAPA's "Can of Know How" commercial. In 2015, Warburton became the star of National Car Rental commercials "Be the Boss of You". And he became the voice in the current "Discover Fresh" radio ad campaign by Souplantation, a California-based buffet-style restaurant chain (the restaurant is known as "Sweet Tomatoes" in other markets).