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Furious customers have been commenting on prices that appear to have more than tripled in some cases.
Jet2, Ryanair, and TUI - amongst others - have come in for criticism for hiking up the costs.
These increases are even after Thomas Cook customers were left with no holiday at all after cancellations due to the grand old travel company's failure.
One person was shocked to discover that flights to Gran Canaria with Ryanair had increased from £24.99 to £82.99.
Another man discovered that his £3,700 honeymoon booked with First Choice had increased to £10,000 practically overnight.
Screenshots showed that a Jet2 package holiday to Cyprus leapt up by £1,500 as well.
A return flight with Jet2 between Manchester and Tenerife climbed to £808 from £442 as well.
According to reports, the First Choice and TUI websites went down, but then returned with prices significantly higher. One customer tweeted: "You're [sic] website goes into 'cleaning mode' and when it's back up? £1,000pp more. Horrible."
Another Twitter user commented: "@jet2tweets should be ashamed of yourselves..... same holiday I was looking at last week is now a price difference of bout £600 ever since Thomas cook announced news of going bust..... shocking."
Guy Anker, from MoneySavingExpert.com told the Sun: "We saw this for the Champions League final in May where Tottenham and Liverpool football fans were fleeced going to Madrid.
"I don't for one second buy that it's just supply and demand.
"Where prices have rocketed overnight at a time when Thomas Cook collapses, I think it's an outrageous piece of profiteering."
LADbible reached out to Ryanair, TUI (of whom First Choice is a subsidiary), Virgin, Jet2 and EasyJet for a comment.
TUI said: "We really feel for everyone affected by the collapse of Thomas Cook.
"Unfortunately, we've had to cancel any TUI and First Choice bookings featuring Thomas Cook flights for any customers due to travel from Monday 23rd September until 31st October 2019.
"We will be contacting these customers to offer a full refund or to explore alternative options, should they still wish to travel.
"TUI uses a dynamic pricing model which means that our prices can go up or down. There are many variables which have to be taken in to account including peak dates of travel, regional airport differences and which channel our customers book through."
Jet2 said: "Our pricing, as is common practice in the travel industry, is based on the principle of supply and demand. As supply reduces, an inevitable consequence is that prices increase. "
"However, we are looking at adding more supply (flights and seats) to help customers at this time."
Virgin Atlantic said: "We have not increased fares on specific routes that were previously also operated by Thomas Cook, nor have we changed any of our pricing policies since Thomas Cook ceased trading.
"We always want to provide the most competitive prices for customers wishing to book future trips with us, and as with all airlines, we operate a dynamic pricing system that is based on availability and demand."
easyJet said: "We are sorry to see the news about Thomas Cook and appreciate the anxiety that their customers will be facing now.
"easyJet is working with the CAA to provide a fully crewed A320 aircraft to support the repatriation efforts over the coming days and customers can find out how to book on to the repatriation flights through the CAA website www.thomascook.caa.co.uk.
"We do not artificially increase prices, however our pricing is demand-led which means that prices rise as fewer seats are available to book."
We'll update the statements here as they come in...
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