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聞いたら

hear (about); find out, ask (someone)

→ 聞く
聞い ask + たら Conditional (“if/when”)
verb · informal Rare #22,246
hear (about); find out 聞いたら means “if/when [someone] hears or learns the information,” often followed by a reaction.
JA: お母さんが聞いたらきっと泣くわ！
EN: Mom will surely cry when she hears!
Conjugation of 聞く
Conditional
聞け聞いたら聞けば聞かれたら

彼がそれを聞いたら喜ぶよ。

He’ll be happy to hear that.

お母さんが聞いたらきっと泣くわ！

If Mom heard that, she’d definitely cry!

— 紅の豚 (1992)

マキが聞いたら怒るわね

Maki would be mad if she heard that.

— 魔女の宅急便 (1989)

答え聞いたら、驚くかも。

You might be surprised when you hear the answer.

その話を聞いたら父のことを思いだした。

Hearing that story reminded me of my father.

ああ、ジェナ、お客様方は、別の宇宙船が来たと聞いたら少し動揺するかもしれないわ

Oh, Jenna, the guests might be a little unsettled when they hear that another spaceship has arrived.

聞いたら喜ぶよ

They’ll be happy to hear that.

— オデッセイ (2015)

彼らはそのニュースを聞いたらびっくりするでしょう。

They’ll be surprised when they hear the news.

それを聞いたら怖くて…何か忠告を頂けます？

Hearing that scares me... Could you give me some advice?

— シカゴ (2002)

verb · informal Rare #45,149
ask (someone) Use this sense when asking a person a question.
JA: 先生に聞いたら、すぐに答えてくれた。
EN: When I asked the teacher, they answered right away.
Conjugation of 聞く
Conditional
聞け聞いたら聞けば聞かれたら

違う人に聞いたら違う答えだった。

When I asked someone else, I got a different answer.

さっきマーニーって聞いたらあんなに驚いてたじゃない

You were so surprised when I asked about Marnie just a minute ago, weren’t you?

— When Marnie Was There (2014)

聞いたら答えろ

If I ask you something, answer me.

— タクシー運転手 約束は海を越えて (2017)

トムに何を聞いたらいい？

What should I ask Tom?