Transport for London (TfL) confirmed to Event that two trains an hour will run to Olympia from 10am to 11pm, for the duration of the show at the Olympia exhibition centre.
The showjumping competition is the first major event at the venue after the regular weekday tube service ends on Friday 9 December.
As reported by Event, TfL confirmed the closure of weekday services to Olympia in September, causing concern in the industry.
When the decision was announced, TfL said that special services could operate to serve large weekday events at the exhibition centre.
London International Horse Show director Simon Brooks-Ward said: "We are delighted that London Underground have recognised the need for the underground service to Olympia for visitors to the Horse Show. Whilst Olympia offers parking and the overground train service, the underground is an integral part of our visitors travel requirements".
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