Билет на самолёт обычно дороже, чем билет на поезд.

With билет, Russian normally uses на + accusative for the thing you have a ticket for:

• билет на поезд
• билет на самолёт
• билет на автобус
• билет на концерт

So this is the standard Russian pattern. It does not translate word-for-word as English on.

• в самолёт would mean into the plane
• для самолёта would mean for the plane

Neither of those means plane ticket.

They are in the accusative singular because they follow на in the pattern билет на + something.

In this sentence, though, you do not see any ending change, because:

• самолёт is an inanimate masculine noun
• поезд is also an inanimate masculine noun

For inanimate masculine nouns, the accusative looks the same as the nominative.

So:

• nominative: самолёт

• accusative: самолёт

• nominative: поезд
• accusative: поезд

If the noun were different, you would see the case more clearly, for example:

• билет на электричку
• билет на выставку

Russian often uses the singular to make a general statement about a whole category, just as English can say:

• A plane ticket is usually more expensive than a train ticket.

So билет here means something like a plane ticket / a ticket of that kind in general.

You could also say:

• Билеты на самолёт обычно дороже, чем билеты на поезд.

That would also be correct, and it sounds a bit more like plane tickets are usually more expensive than train tickets. The singular and plural versions are both natural.

Дороже is the correct standard comparative form of дорогой.

• дорогой = expensive
• дороже = more expensive

This comparative is formed irregularly, with a stem change:

• дорог- → дорож-

So the correct form is дороже, not дорогее.

Russian often uses these short comparative forms:

• быстрый → быстрее
• дешёвый → дешевле
• дорогой → дороже

You can also use the longer analytical form:

• более дорогой

For example:

• Билет на самолёт обычно более дорогой, чем билет на поезд.

But in this sentence, дороже is the most natural choice.

Because дороже is a comparative form, and these short comparatives are normally invariable. They do not change for:

• gender
• number
• case

So you get:

• билет дороже
• машина дороже
• билеты дороже

The form дороже stays the same.

That is different from full adjectives like дорогой / дорогая / дорогое / дорогие, which do agree with the noun.

Чем is the normal Russian word for than after a comparative.

So:

• дороже, чем билет на поезд = more expensive than a train ticket

This is one of the most common comparison patterns in Russian:

• лучше, чем
• быстрее, чем
• дороже, чем

It introduces the second thing being compared.

Yes. Russian also allows a comparison with the genitive after a comparative.

So you can say:

• Билет на самолёт обычно дороже билета на поезд.

This means the same thing.

Both versions are correct:

• дороже, чем билет на поезд
• дороже билета на поезд

The version with чем often feels clearer and more explicitly parallel, especially when the compared phrase is longer.

In the present tense, Russian usually omits the verb to be.

So where English says:

• A plane ticket usually is more expensive...

Russian simply says:

• Билет на самолёт обычно дороже...

This is completely normal.

If the sentence were in the past or future, you would see a form of быть:

• Билет на самолёт был дороже...
• Билет на самолёт будет дороже...

Yes, it could be left out if the meaning is obvious.

The full sentence repeats the noun for clarity and balance:

• Билет на самолёт обычно дороже, чем билет на поезд.

A shorter version is also possible:

• Билет на самолёт обычно дороже, чем на поезд.

In that shorter version, the second билет is understood.

The repeated version is a little clearer and especially useful for learners, while the shorter one is common in everyday speech.

Yes. Russian word order is fairly flexible, and обычно can move.

For example:

• Билет на самолёт обычно дороже, чем билет на поезд.
• Обычно билет на самолёт дороже, чем билет на поезд.

Both are natural.

The difference is mostly about emphasis:

• Билет на самолёт обычно... = neutral flow
• Обычно билет на самолёт... = slightly stronger focus on usually

Not every position sounds equally natural, but Russian does allow more movement than English.

Russian has no articles, so билет can mean:

• a ticket
• the ticket
• tickets in a generic sense, depending on context

In this sentence, the meaning is generic: it is talking about plane tickets and train tickets in general.

If Russian needs to be more specific, it can use other tools, such as:

• context
• word order
• demonstratives like этот = this

For example:

• Этот билет на самолёт дороже. = This plane ticket is more expensive.

But in your sentence, no extra marker is needed.

The stress is:

Биле́т на самолёт обы́чно доро́же, чем биле́т на по́езд.

A few useful points:

• ё is always stressed, so самолёт is stressed on the last syllable
• in many everyday texts, Russians write самолет instead of самолёт, but it is still pronounced самолёт
• по́езд is stressed on the first syllable

For learners, it is very helpful to remember ё, even when native texts leave the dots off.