|Commenced operations||23 April 2018|
|Parent company||Ryanair DAC|
Ryanair Sun is a Polish airline headquartered in Warsaw. It is a subsidiary of the Irish airline company, Ryanair Holdings, and a sister airline to Ryanair, Ryanair UK, Malta Air and Laudamotion. Formed in 2017 and initially positioned as a charter airline without any scheduled services, Ryanair Sun has begun to operate scheduled flights behalf of Ryanair out of Poland. In March 2019, Ryanair announced that the Ryanair Sun will be rebranded as Buzz in autumn 2019.
On April 3, 2018, the carrier received an Air operator's certificate granted by the Polish Civil Aviation Authority. It started operations on 23 April 2018 and the first flight took place on 26 April 2018, on the route from Pozna?-?awica Airport to Zakynthos International Airport. In Poznan and Wroclaw the carrier will use the infrastructure of already existing bases, while in Katowice and Warsaw new ones were created. Representatives of the carrier announced that all five aircraft in the Ryanair Sun fleet will receive Polish registration numbers. During summer 2018, Ryanair Sun operated one own Boeing 737-800 registered as SP-RSA. The aircraft was employed on charter flights from Warsaw-Chopin.
In September 2018 Ryanair announced the closure of its own Polish bases by 1st January 2019. Operations were to be transferred to Ryanair Sun, meaning Ryanair Sun would operate on behalf of its parent company. Cabin and flight crew were made redundant at Ryanair and were given the option to apply as self-employed contractors for a Polish-based aviation agency, Warsaw Aviation. Warsaw Aviation itself would then lease out the self-employed contractors to Ryanair Sun. In late October 2018, the then-only Ryanair Sun aircraft SP-RSA ceased charter operations out of Warsaw Chopin. The aircraft subsequently replaced Ryanair mainline capacity out of Warsaw Modlin, now operating scheduled services on behalf of its parent company. Starting from November 2018, several former Ryanair-operated Boeing 737 were moved from the Irish to the Polish registry and now operated by Ryanair Sun on behalf of its parent companies scheduled flights out of Poland.
In March 2019, Ryanair announced that the airline would be rebranded as Buzz from autumn 2019. Buzz was the name of a UK budget airline Ryanair bought from KLM in April 2003. Buzz will still operate scheduled and charter flights from its bases in Poland, and aims to expand its fleet from 17 Boeing 737-800s to 25 by summer 2019. 
As of May 2019, the Ryanair Sun fleet consists of the following aircraft:
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