Ryanair has been fined €370,000 in the Netherlands for offering fares withouit fees and surcharges, leading consumers to pay "considerably more" than the advertised fare.
The Dutch consumer authority said Ryanair had violated European regulations by failing to make the full costs of bookings clear.
Ryanair dismissed the decision as "littered with errors" and said it would appeal.
The authority found: "Ryanair offered air fares on its website that did not include all foreseeable and unavoidable costs, such as fees and surcharges.
"Consumers paid considerably more than the air fares that were initially displayed."
It said consumers were not given the option to correct details before completing a booking, that the airline was difficult to contact and it failed to provide information in Dutch.
A Ryanair spokesman said: "The decision of the Dutch consumer authority is littered with errors.
"Ryanair will appeal this unfounded decision and confirms its website fully complies with all EU and Dutch consumer protection regulations."
The authority said Ryanair had revised its booking process and now provides accurate prices.
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