Economy class tickets from HCMC to Hanoi are sold out while business class tickets are available at VND9 million (US$380) as people travel to attend the Blackpink concert Saturday.
Source: VNExpress International,
https://e.vnexpress.net/news/travel/one-way-air-ticket-from-hcmc-to-hanoi-costs-380-as-blackpink-show-nears-4635471.html