Turkey is also seeking to return to the US-led F-35 fighter jet programme, from which the country was ousted in 2019 following its purchase of Russian-made S-400 missile defence systems.
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The UK and Turkey signed a preliminary agreement on Wednesday for the sale of Eurofighter Typhoon fighter jets to Turkey, marking a significant step in Ankara's efforts to modernise its air fleet.
Turkish Defence Minister Yaşar Güler and his British counterpart, John Healey, inked a memorandum of understanding during a defence industry fair in Istanbul, Turkey's Ministry of National Defence said.
NATO member Turkey has long aimed to buy 40 Eurofighter jets, which are built by a consortium of British, German and Italian companies.
Germany reportedly initially opposed the sale but later reversed its position. Britain led negotiations on behalf of the consortium.
A Turkish defence ministry statement said the memorandum takes the two countries "one step closer to a full agreement on the Typhoon."
"Both Ministers welcome signature as a positive step towards bringing Turkey into the Typhoon club and share a mutual ambition to conclude the necessary arrangements as soon as possible," it added.
Turkish officials have said that they are still negotiating over pricing and technical terms, saying that they have received an initial offer and expect to submit a counter-proposal.
Turkey is also seeking to return to the US-led F-35 fighter jet programme, from which the country was ousted in 2019 following its purchase of Russian-made S-400 missile defence systems.
The US said the systems were incompatible with NATO tech and posed a risk to the F-35s.
Turkey is also developing a domestic fifth-generation fighter jet, the KAAN, which is slated to be operational in 2028.