WELLINGTON, New Zealand--Travel-booking software company Serko Ltd. said it plans to raise up to 55 million New Zealand dollars ($36.4 million) from the sale of new shares as it seeks to ride out a travel slump brought on by the coronavirus pandemic.

The company, whose shareholders include the owner of Booking.com, is aiming to raise NZ$45 million from institutional investors and NZ$10 million from retail investors, it said Thursday.

The shares in the institutional placement are offered at a floor price of NZ$4.35, which is a 3.5% discount to the last closing price.

Serko, which has cash reserves of NZ$33.6 million, forecast monthly cash losses of NZ$2 million to NZ$4 million over the remainder of its current financial year.

It said the fundraising will allow it to take advantage of growth opportunities when international travel returns to more normal levels.

Write to Stephen Wright at stephen.wright@wsj.com