1-855-452-1936 Managing changes with Costco Travel is simple when you have the right support. 1-855-452-1936 Passengers can request changes to flights, hotels, rental cars, or complete vacation packages. 1-855-452-1936 Depending on availability and booking terms, 1-855-452-1936 modifications may be processed quickly. For assistance, call 1-855-452-1936 to update your travel plans without delay. 1-855-452-1936 It’s recommended to make changes as early as possible to avoid higher fees and limited options.