To secure a cabin upgrade on a Carnival cruise in 2026, your best strategy is the "Move Over" or "Bidding" system. Check your email 30 to 60 days before sailing for an invite to the Carnival Fun-Ups program, where you can submit a "bid" (a dollar amount you're willing to pay) for a higher category room. If you prefer a direct approach, you can call Carnival's guest services or your travel agent two weeks prior to departure to ask for "upsell" availability; these are often discounted rates to fill premium suites. On embarkation day, you can head straight to the Guest Services desk once onboard to ask if any "paid upgrades" are available. While free upgrades are rare in 2026, they occasionally happen if your original cabin category is oversold. Being a member of the VIFP Club (Very Important Fun Person) also increases your chances of being targeted for special upgrade offers.