kono eki made no untin ha takai node, teikiken ga aru to tasukaru.

この駅までの means to this station or more literally the fare up to this station.

Breakdown:

• この駅 = this station
• まで = up to / as far as
• の = links that whole phrase to the noun that follows

So:

• この駅までの運賃 = the fare to this station

Here, まで creates the destination range, and の turns that phrase into something that can modify 運賃.

You can think of it like:

• [this station up to] + fare

which becomes natural English as the fare to this station.

まで focuses on the endpoint: as far as this station.

With transportation and fares, Japanese often uses まで because the idea is the cost up to a certain destination.

So:

• この駅までの運賃 = the fare as far as this station

If you used に or へ, it would sound more like direction or destination in a general sense, not specifically the fare calculated up to that point. For fares, までの運賃 is very natural.

は marks 運賃 as the topic.

• 運賃は高い = As for the fare, it is expensive

This does not necessarily mean the fare is the grammatical subject in the English sense. It means the sentence is talking about the fare and then saying something about it.

Using は also gives a slight contrastive feel in some contexts, like:

• The fare is expensive
  possibly implying that something else may not be.

But here it is mostly just the normal topic marker.

運賃 specifically means a fare, especially for transportation such as trains, buses, or taxis.

• 運賃 = transportation fare
• 料金 = fee/charge in a broader sense

So:

• train fare → 運賃
• hotel fee, service fee, admission fee, etc. → often 料金

In this sentence, 運賃 is the most precise word because it is talking about the cost of traveling to a station.

Both ので and から can mean because, but they feel a little different.

• ので sounds a bit more explanatory, softer, and slightly more formal/polite
• から sounds more direct and conversational

So:

• 運賃は高いので、定期券があると助かる。 = Since the fare is high, having a commuter pass would help.

This sounds natural and mildly explanatory.

If you said:

• 運賃は高いから、定期券があると助かる。

that would also be grammatical, but a bit more direct.

Because 高い is an i-adjective.

For i-adjectives, you attach ので directly:

• 高い → 高いので

For na-adjectives and nouns, you usually need な before ので:

• 便利 → 便利なので
• 学生 → 学生なので

So:

• 高いので is correct
• 高いなので is incorrect

定期券 means a commuter pass or season ticket, usually for regular travel on trains or buses.

It is the kind of pass you buy for repeated travel between fixed points, often for:

• commuting to work
• going to school

So in this sentence, the speaker is saying that because the fare is high, having a commuter pass would be helpful.

Both can express the idea of having a pass, but they feel a little different.

• 定期券がある = there is a commuter pass / I have a commuter pass
• 定期券を持っている = I am holding/possessing a commuter pass

In Japanese, ある is very commonly used to say that someone has an inanimate thing.

So:

• 車がある = I have a car
• 時間がある = I have time
• 定期券がある = I have a commuter pass

This is very natural.
持っている is also possible, but it emphasizes possession more directly.

Yes, と is a conditional here.

• ある = to have / to exist
• と = if / when
• 助かる = it helps / I’m saved / that would be helpful

So:

• 定期券があると助かる = If I have a commuter pass, that helps
• more natural English: Having a commuter pass would help
• or It would really help if I had a commuter pass

In this sentence, と gives a natural if that condition is true, this is the result feeling.

助かる literally comes from the idea of being saved or helped, but in everyday Japanese it often means:

• that would help
• that would be a big help
• that would make things easier

So here it does not mean a dramatic rescue. It means something like:

• A commuter pass would really make things easier
• It would be helpful to have a commuter pass

It often carries a practical, slightly personal feeling.

The person being helped is understood from context, usually the speaker or someone relevant in the conversation.

So this sentence probably implies something like:

• I’d be helped
• it would help me
• it would make things easier for me/us

Japanese often leaves out subjects and objects when they are obvious from context. That is very normal.

A fully explicit version might be something like:

• 私は定期券があると助かる。

But in natural Japanese, leaving out 私 is usually more natural.

Yes, grammatically it can sound fairly general, but in real context it usually implies having one available to the person concerned.

Because Japanese often omits the owner, the phrase can be interpreted as:

• If I have a commuter pass, it helps
• If you have a commuter pass, it helps
• Having a commuter pass is helpful

The exact meaning depends on context. In many everyday situations, listeners naturally understand it as the speaker’s point of view unless something else is stated.

Because in Japanese, the because/since clause often comes first.

• 運賃は高いので、... = Because/Since the fare is high, ...

Japanese commonly puts the reason before the result. English can do the same, but translations may vary:

• Because the fare to this station is high, having a commuter pass would help.
• Since the fare to this station is high, it would help to have a commuter pass.

Both match the Japanese structure well.

It is basically plain style, but ので gives it a somewhat softer, more polite tone than a blunt plain sentence.

Notice:

• 高い
• ある
• 助かる

These are plain-form endings, not polite です / ます forms.

A more explicitly polite version could be:

• この駅までの運賃は高いので、定期券があると助かります。

That would sound more appropriate in formal conversation.

Yes. A few natural alternatives are:

• この駅までの運賃は高いので、定期券があると便利だ。
  = Since the fare to this station is high, a commuter pass is convenient.

• この駅までの運賃は高いので、定期券があるとかなり助かる。
  = Since the fare to this station is high, having a commuter pass would help a lot.

• この駅までの運賃は高いから、定期券があると助かる。
  = Because the fare to this station is high, having a commuter pass would help.

Each version changes the nuance slightly, but the original sentence is natural and clear.