出かけるの

going out

→ 出掛ける
phrase Uncommon #14,029
going out 出かける means “to go out.” Sentence-final の adds an explanatory or questioning tone; 出かけるの? commonly means “Are you going out?” The related form 出かけるんだ states or emphasizes that someone is going out.
JA: 明日はどこへ出かけるの?
EN: Where are you going out to tomorrow?

何時ごろ出かけるの

About what time are you heading out?

出かけるの

Are you going out?

— 恋する惑星 (1994)

出かけるの

I'm heading out.

— 箪笥<たんす> (2003)

今夜は出かけるの

Are you going out tonight?

また出かけるの

Are you going out again?

いつ買い物に出かけるの

When are you going shopping?

どこかに出かけるの

Are you going somewhere?

悪いけどもう出かけるの

Sorry, but I’m heading out now.

— ダーク・プレイス (2015)

トムってよく出かけるの

Does Tom go out often?