It's hoped to get a new franchisee in place for Alderney Week, which begins on 7 August.
Guernsey Ports says it was given little notice of the intended closure of the Aviator Cafe, which stopped operating last night (31).
Alderney Week, which is the busiest travel time of the year for the island, will see people arriving in number from Saturday 5 August.
Ports says several businesses have said they're interested in running the cafe short term, until the end of the year.
These will be treated as formal expressions of interest.
It's planned to get an operator in place within days. In the meantime, passengers are being reassured that while there won't be a full food and drinks service, there is a fresh drinking water dispenser in the terminal.
Next year, work is planned to go ahead on rebuilding the terminal and a new, longer runway.

Marine life focus of special documentary screening in Guernsey
New clubhouse facilities for Guernsey's Victoria Park stadium
Those living with Dementia in Guernsey can take a virtual walk down memory lane
Anglers warned after litter and minor damage at Guernsey's main harbour
Alderney airlinks "operating as usual" following disruption
Guernsey's Wildlife Hospital nears completion
Guernsey's 50th Swimarathon raises more than £70,000
Scheme to help Guernsey residents cover rental deposits