Quiero comprar un billete de ida.

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Breakdown of Quiero comprar un billete de ida.

• querer: to want
• un: a
• comprar: to buy

Questions & Answers about Quiero comprar un billete de ida.

Why is it quiero and not yo quiero?

In Spanish, the subject pronoun is often omitted because the verb ending already tells you who the subject is.

• quiero = I want
• The -o ending shows it is yo

So Quiero comprar... is completely natural.
You can say Yo quiero comprar... if you want extra emphasis, contrast, or clarity, but it is not necessary.

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Why is it un billete and not una billete?

Because billete is a masculine noun in Spanish.

• el billete
• un billete

Even though the word ends in -e, that does not automatically make it masculine or feminine. Nouns ending in -e can be either, so you usually have to learn the gender with the noun.

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What exactly does de ida mean here?