Next European Parliament election will be in 2029.

Edit: there was a copypaste of voting requirements here, from https://eur-lex.europa.eu/EN/legal-content/summary/voting-ri.... This is apparently wrong; you can also vote if you're not residing in the EU, only EU citizen. (I thought this was the case, and that link not saying that made me suspicious.) How it is possible that they've put up incorrect information on voting rights, I have no clue.

Actual reference, this time legal text: https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A...

Any person who, on the reference date:

(a) is a citizen of the Union within the meaning of the second subparagraph of Article 8 (1) of the Treaty;

(b) is not a national of the Member State of residence, but satisfies the same conditions in respect of the right to vote and to stand as a candidate as that State imposes by law on its own nationals,

shall have the right to vote […]

So either citizenship or residency is sufficient.

I was talking about voting for the position held by Ursula, the president of EU commission, not the EU parliamentary elections.