The most popular airports for Delta are Atlanta Hartsfield-Jackson, Tampa, and Orlando according to our data. Flights to or from any of these airports should be available via Delta year-round.
The cheapest domestic Delta flight is flying Spokane to Seattle/Tacoma Intl, which is HK$609. This round-trip flight has 0 stops. For a one-way domestic Delta flight, the cheapest route is Seattle/Tacoma Intl to Portland (0 stops) for HK$305.
Based on current airline data, it looks like Delta has around 20 flights from Hong Kong Intl per week. Keep in mind that this could change based on demand and cancellations.