Attempting to secure a cheaper rail ticket by putting the holiday back a further month didn't succeed. For that weekend, it is cheaper to travel to Barcelona (£34), Dublin (£36), Oslo (£37), Milan (£44), Pisa (£46) and Venice (£57).
Cllr John Coyne, Liverpool council's sole Green Party councillor, said: "What these figures show is that the cost to the environment of flying is not reflected in the price of an air ticket.
"I do not think this will be allowed to continue and, at the moment, we are in a unique position where people can travel across Europe for less than travelling by train to London.
"Train ticket prices keep rising, and it is no incentive for people to use the train, when the car and the aeroplane remains such an attractive proposition.
"The Government needs to correct the rail pricing system so that companies can pass savings on to passengers."
A spokesman for Passenger Focus said: "The network is becoming a rich man's railway. Many families can no longer afford to travel by train unless they are super-organised about booking tickets and have a railcard. If people don't have flexibility for when they can travel, it is becoming very expensive to travel by train."
A recent University of Oxford study concluded that domestic tourism was beginning to suffer from the growth in cheap air travel.
Figures suggest that flying brings into the economy £9.9bn in tourism pounds, well short of the £13.4bn which is leaving the country at the same time.
A spokesman for Transport group Transport 2000 said: "This has been caused by a massive growth among airlines. A return flight to Los Angeles can sometimes be had for the same price as a return train ticket from London to Glasgow."
Announcing the recent price increases on the trains, the Association of Train Operating Companies promised operators would "continue to raise their game".
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