The round-trip ticket is not from the airline. Can I get a refund if the departure flight informs me that my return trip is delayed?

You'd better change the ticket, otherwise, there is no way to refund the ticket. Airline refund can be handled by airline customer service phone or ticket agent, and the refund fee varies according to different airlines. Generally speaking, full-price tickets for first class, business class and economy class are free of refund fees; Economy class tickets are refunded between 30% and 99% of the fare, and a refund fee of 10% of the face price is charged; If the refund is between 50% and 69% of the fare, a refund fee of 20% of the face price will be charged; If the refund is between 40% and 49% of the ticket price, a refund fee of 50% of the face price will be charged. Refund of tickets with fares less than 40% discount shall be implemented according to the specific use of freight products, and generally cannot be returned or changed. Airport construction fees and fuel costs can be refunded, but they cannot be refunded if you buy insurance.