There has been talk around the likely cancellation of the MLB 2020 London Series between the St. Louis Cardinals and Chicago Cubs event since opening day was pushed back, but on Wednesday, April 1, the event was officially cancelled by MLB. Ticket holders who purchased tickets via Ticketmaster or London Stadium will automatically receive full refunds, including service charges.
Further information can be found on the official MLB and London Series releases:
Based on the current communications from MLB, there is no plan to postpone the games until 2021. Therefore as it stands, all St. Louis Cardinals home games in 2021 will remain in Missouri with no further plans for a London Series.