Scottish MPs spent more than £700k on flights to and from Westminster in a year.
Figures from the Independent Parliamentary Standards Authority, which lists MPs expenses, showed that the 59 MPs spent £736,651.55 on air travel between December 2021 and November 2022.
This means the average MP spent £320.14 on flights per week that parliament was sitting.
The 45 SNP MPs spent £549,786.62, while the six Conservatives spent £77,838.40 and the four Lib Dem MPs spent £65,712.94. Labour's sole MP Ian Murray spent £9,312.52 while Alba spent £16,404.44.
The figures raise questions over the environmental impact and the cost of MPs regularly taking domestic flights.
Campaigners have said the statistics showed Scottish politicians were not "really serious about cutting carbon."
It comes just months after Scottish Greens co-leader and Scottish Government minister Lorna Slater called for the UK to copy France in banning domestic flights where other forms of travel are available.
On average each Scottish MP spent £12,485.62 on flights between December 2021 and November 2022. The average SNP MP spent £12,217.48, the average Tory spent £12,973.07 and the average Lib Dem spent £16,428.24.
Lib Dem Alistair Carmichael had the most air travel expenses at £36,331.81. This was unsurprising as he represents the Orkney and Shetland islands.
Several of the other high-spenders were from the islands or the north of Scotland.
But West of Scotland SNP MPs Carol Monaghan, Patricia Gibson, Chris Stephens, Ronnie Cowan and independent MP Margaret Ferrier all spent more than £17,600 on flights despite there being a direct train route from Glasgow to London. The average train time between the two cities takes less than six hours.
SNP Westminster leader Stephen Flynn spent £17,151.96 in flights from his Aberdeen South constituency to Westminster, while Scottish Tory leader Douglas Ross spent £9,037.42.
East Lothian Alba MP Kenny MacAskill and Tory Scotland Secretary Alister Jack, who represents Dumfries and Galloway, did not expense any air travel costs.
SNP MPs John McNally and Martyn Day, who represent Falkirk and Linlithgow and East Falkirk, both spent under £350 on flights. Lib Dem North East Fife MP Wendy Chamberlain was the only other MP to spend less than £1,000 on air travel.
Director of campaign group Transform Scotland Colin Howden said: "Scottish politicians claim to care about climate change yet their actions betray them. If they are really serious about cutting carbon then they should be choosing to travel by train rather than jumping on a plane.
"Transport is the biggest contributor to climate change, and air travel is the most damaging form of transport. Flying is five times more polluting than trains, while most of the trains running from Edinburgh to London emit up to 97% less carbon.
"For journeys between Central Scotland and London in particular, travelling by train is often just as quick as flying and comes with other benefits such as the ability to work on the train."
Director of campaign group Flight Free UK Anna Hughes said: "At a time of climate crisis, it is irresponsible to be using public funds to pay for carbon-intensive travel between Scottish cities and London, especially when there is a low-carbon alternative available. Taking the train between Edinburgh and London saves more than 90% on carbon emissions compared to a flight.
"At over £450 for a typical return journey, it's not even as though MSPs are using air travel to save money. In reality it's cheaper, just as quick and much lower-carbon to take the train.
"The Scottish parliament declared a climate emergency in 2019, but that means nothing if it's not followed up with action. It is up to all of us to do all we can to reduce emissions, and that includes our politicians."
An SNP spokesperson said: "Scottish MPs are required to travel to Westminster each week - and naturally have higher travel costs due to the longer distance involved.
"When Scotland becomes an independent country, the cost of travelling to Westminster will be zero. Until then, SNP MPs will continue to represent their constituents and hold the Westminster government to account."
A Scottish Conservatives spokesperson said:
“All of these claims have been submitted in line with Parliamentary guidelines.
“Scottish Conservative MPs travel to Westminster each week to stand up for their constituents and ensure the focus is on Scotland’s real priorities, such as the cost-of-living crisis, fixing our NHS and strengthening our economy.
“That is in sharp contrast to SNP MPs who continue to push for another divisive independence referendum at every turn.”
A Scottish Lib Dem spokesperson said: "Scottish Liberal Democrat MPs are active representatives in both their constituencies and in Westminster and as such a significant amount of travel is part of the job, particularly when you represent both Scotland's most northerly islands and its most northerly mainland constituency."
Scottish Labour, Alba and Margaret Ferrier were contacted for comment.
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