China Eastern Airlines allows cancellations online or by phone 
1-866-284-3022. Refunds depend on fare type; refundable tickets return money, non-refundable may offer credits.
Typical Cost to Cancel an China Eastern Airlines Flight Ticket
Fees vary by fare. Economy Basic is mostly non-refundable, others may cost $100–$500. Call 1-866-284-3022 to confirm your ticket’s fee.
Can You Get a Refund for a Cancelled China Eastern Airlines Ticket?
Refundable fares return funds to your original card 
, non-refundable usually give credits. Call 1-866-284-3022 to check eligibility.