madogawa no seki wo onegaisimasu.

窓側 is read まどがわ and means the window side.

In this sentence, it refers to a seat on the side near the window, such as on a train, airplane, or in a restaurant. So it is not just window; it is specifically the side by the window.

の connects nouns.

Here, 窓側の席 literally means window-side seat.

You can think of the pattern as:

A の B = B associated with A

So:

• 窓側 = window side
• 席 = seat
• 窓側の席 = a seat on the window side

席 means seat, place, or spot where someone sits. It is the natural word when talking about where you want to sit.

By contrast, 椅子 means the physical object chair.

So if you are asking for seating, 席 is the right word because you are asking for a place, not for a chair as an object.

を marks the thing being requested.

Here, the thing you want is 窓側の席.

So:

• 窓側の席 = window-side seat
• を = marks that as the object
• お願いします = please / I’d like / I request

Together, it means you are requesting that kind of seat.

お願いします is a very common polite expression. In this kind of situation, it means something like:

• please
• I’d like ...
• that, please

It comes from the verb 願う, which has the idea of requesting or asking for something.

So 窓側の席をお願いします is literally something like I request a window-side seat, but in natural English it is more like A window seat, please.

Japanese often leaves out information that is obvious from context.

In this situation, everyone understands that the speaker is talking about their own preference, so there is no need to say 私は or anything similar.

Japanese often sounds more natural when the subject is omitted if it is clear already.

Yes. It is a very natural polite request.

It works well in places like:

• restaurants
• cafés
• trains
• airplanes
• buses
• waiting areas

Japanese often uses short, polite requests like this instead of full explicitly stated sentences.

It is polite and standard.

お願いします is appropriate in everyday service situations. It is neither rude nor unusually formal.

If you want to be even more formal, you could say:

• 窓側の席をお願いいたします。
• 窓側の席をお願いできますか。

But 窓側の席をお願いします。 is already perfectly good in most situations.

They are similar, but not exactly the same.

• 窓側 = the window side, often contrasted with the aisle side
• 窓際 = right by the window, at the window edge

For trains and airplanes, 窓側 is especially common because there is usually a clear contrast between window side and aisle side.

For example:

• 窓側 ↔ 通路側
  window side ↔ aisle side

In a café or restaurant, 窓際の席 is also very common when you mean a seat right next to the window.

You might be understood, but 窓側の席 is more natural when you mean a seat on the window side.

窓の席 sounds less standard because 窓の simply means of the window or window’s, which is not the normal way to describe this kind of seat choice.

So if you are choosing between window and aisle, 窓側の席 is the better expression.

It is read:

まどがわ の せき を おねがいします

A few pronunciation notes:

• 窓側 = まどがわ
• 席 = せき
• を is usually pronounced お in modern Japanese speech
• お願いします = おねがいします

Also, in normal writing, Japanese is usually written without spaces:

窓側の席をお願いします。

The spaces are often added only for learners.