Four out of five long journeys in the UK cost more by train than by plane, almost three times the price in some cases.
The huge differences were revealed when airlines launched dozens of cheap domestic routes amid a travel boom this year.
Taking the train was more expensive in most cases, which one? the researchers found, with an average margin of 49 percent.
The biggest difference was a round trip from Birmingham to Newquay, Cornwall, with flights at £ 67 and a train at £ 180 – 2.7 times more.
The consumer champion said the price advantage for flying is a disaster for the environment, given the sheer amount of greenhouse gases created by theft.
Aircraft CO2 emissions are on average six times higher than those caused by the train, which means travelers face a difficult choice between cheaper and shorter flights or a more environmentally friendly train ride .
Boris Johnson was criticized last month for traveling to Cornwall for the G7 event as the Queen set an example by traveling by train.
Four out of five long journeys in the UK cost more by train than by plane – almost three times the price in some cases [Stock image]
Which? said the Birmingham to Newquay rail route involved two changes. At the same time, the total travel time for both legs of the trip would be more than ten hours longer than by plane.
But flying on this route would emit more than five times as much CO2, creating an average of 156 kg of emissions per passenger compared to 27 kg by train.
Round-trip flights between Bristol and Newcastle cost £ 87 per person, compared to £ 172 by train, which would take at least six more hours of travel time. Alarmingly, a return flight would emit 203 kg of carbon dioxide per person, compared to 33 kg for the train.
The flight routes with the highest emissions were Edinburgh to Bournemouth and Glasgow to Southampton with 287 kg of CO2 per person. The figure for the train was 52 kg.
Which? Travel Editor-in-Chief Rory Boland said: “Travelers who choose to take the train face significantly higher fares and journey times, putting those who wish to reduce their environmental impact at a disadvantage. “
EasyJet is offering 12 new routes with one-way tickets for as little as £ 14.99.
But John Sauven of environmental activists Greenpeace UK said: “Domestic flights have long been a symbol of how our economic system incites our own destruction.
“The UK government claims to be a climate leader, but is considering lowering taxes on domestic flights when they are cheaper than train fares on many routes. “
The industry body, the Rail Delivery Group, pointed out that rail transport is subject to higher fuel tariffs than airplanes, and suggested the travel times used by Which? were misleading as train stations are usually located in city centers while airports are outside of the city.
A spokesperson said: “Taking the train is one of the most environmentally friendly ways to travel, which is why we are calling on the government to take a ‘polluter pays’ approach to transport taxes, unlike the law. zero on fuel for airplanes compared to the 40 percent Electricity Tax for powering trains.
Aircraft CO2 emissions are on average six times higher than those caused by the train, which means travelers face a difficult choice between cheaper and shorter flights or the more environmentally friendly rail route [Stock image]