A man's social media post has gone viral (it's been viewed more than six million times) after it showed him being quoted £786.80 for two return train tickets from Newcastle to London.
X user Lee later clarified the tickets were for a Tuesday to Thursday trip in seven days time.
A screenshot of the quote showed the tickets he was trying to purchase were anytime single tickets, which had been advertised on the website as the "cheapest" option.
"Are you out of your actual minds?" Lee said in his post.
Other social media users were just as shocked, with many also complaining about increased fares.
"I book train travel for work colleagues and it's eye watering.. if it was cheap to use public transport, as it is in other countries, more people would use it," one replied.
"We live an hour away from London and train tickets on the weekend can set us back over £100 each. So then we drive which is the total opposite of what public transport is supposed to encourage?" said another.
Rail tickets increased by 4.9% in England and Wales in March.
An LNER spokesperson told the Money team: "We haven’t been provided with the full details for this journey. However, it appears the prices quoted are for peak time travel during a period of very high demand.
"Alternative trains have much cheaper Advance and 70 Minute Flex tickets available for travel in Standard from Newcastle to London King's Cross, subject to seating capacity being available.
"We always encourage customers to book as early as possible for best value fares."