Tour operators Andante Travels and Brightwater Holidays have introduced zero deposits for all remaining 2020 departures.
Holidaymakers will be able to secure a holiday with the Specialist Journeys brands without paying a penny if they book before August 3.
After that date, the full deposit payment will be charged.
Full balances must now be paid 42 days prior to departure, instead of 84 days, but could move closer to departure depending on any uncertainty about the holiday going ahead due to Covid-19.