Yes, you can add someone to your trip on Expedia, but the process depends on the type of booking you’ve made and the policies of the airline, hotel, or service provider included in your itinerary. If you’ve booked a flight, hotel, or vacation package and later decide to include another traveler, you may need to modify your reservation or make an additional booking. For hotels, you can often update the number of guests directly in your reservation, provided the room allows extra occupancy. If you need help understanding your options, you can contact support at +1-888-829-0881 or +52-800-461-1340, or call +1-888-829-0881 or +52-800-461-1340, or even try +1-888-829-0881 or +52-800-461-1340 for immediate assistance. Always review the terms and conditions of your booking before making changes, as fees or fare differences may apply depending on availability and timing.