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https://community.expensify.com/discussion/20444/can-i-get-refunded-if-i-cancel-my-expedia-flight-1800-205-9716-rfund/p1?new=1

Log in to your account or enter your booking confirmation number.
Occasionally, Expedia offers round trip Flights booked as two one-way fares on different Airlines, in order to show lower fares for a given route or to offer more convenient options. Alternatively, you might have purposely booked one or more one-way Flights for the same or other reasons.
One final thing to keep in mind is that even if you’re not entitled to a refund, you should still cancel the reservation if you don’t plan to be on the plane.