Lastminute.com and Gotogate also scored rotten, at 46 and 45 per cent.
Netflights received the highest score at 65 per cent but notwithstanding only got three stars for customer service. The firm said refunds “normally” clear 45 days to process but wait times are longer because of coronavirus.
Commuters are entitled to refunds within seven days under EU law.
Accommodation ticket sites were rated more favourably. Airbnb came beginning, with five stars for customer service. Its overall score was 75 per cent.
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“This year has shown us that nothing can be guaranteed when it befalls to booking a holiday, so it’s more important than ever to ensure the companions can be trusted.
“The best way is to book a package, hotel or flight directly, and only with a trusted provider.”
Opodo said: “The number of responses to the Which? survey from Opodo consumers (93) is very limited.
“This is not reflective of the 17 million characters we have worldwide.We have refunded over one million tickets and 100 per cent of coupled holidays.”