That's just 2p more than the cost of a single journey from zone 1-4 in London.
The airline has slashed its prices on return flights by up to £30, with the sale ending at midnight tonight.
Fares start from £2.92 one-way – running from London Stansted to Oslo Torp in Norway, Lviv in Ukraine and Olsztyn – Mazury in Poland – click here to book.
There are are further flights for under a fiver though, to both Goteborg Landvetter and Stockholm in Sweden, plus flights to Malaga, Barcelona, Valencia and Murcia for under £8.
The discounts are for flights between next January and May.
Customers trying to log in to the site were informed it was "down for maintenance" for several hours overnight on November 19.
Customers have 48 hours to check in online or they face being charged £55 to check in at the airport and with the site down some were hit by charge.
One Twitter user said: "Customer service, both online and on the phone, refused to acknowledge the website being down and/or having the ability to check in online.
"Think that's called scamming people for having a shoddy website
The Sun Online has contacted Ryanair for an explanation.
There are plenty of travel deals out there today for Black Friday – check out our round-up here.
Prices were correct at time of publication.
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