Can I change my flight if I booked through Expedia?

Yes, you can change your flight if you booked through Expedia, but it depends on the airline’s policies and fare rules. Some flights allow changes with a fee, while others may be non-changeable. To modify your booking, log in to your Expedia account, access your itinerary, and follow the instructions provided.

Source: https://community.upwork.com/t5/Support-Forum/Can-I-change-my-flight-if-I-booked-through-Expedia/m-p/1661329#M181097