Хорошо, что мы договорились о времени встречи.

Yes. Хорошо, что... is a very common Russian pattern meaning It’s good that... or It’s a good thing that....

In this sentence, хорошо is not just an ordinary adverb like well. It functions as an impersonal predicate: Russian often uses words like хорошо, плохо, жаль, важно in this way.

So:

• Хорошо, что мы договорились... = It’s good that we agreed...
• literally: Good, that we agreed...

Russian often leaves out the equivalent of it is in this kind of sentence.

Because что introduces a subordinate clause.

The structure is:

• Хорошо = main statement
• что мы договорились о времени встречи = clause explaining what is good

So Russian puts a comma before что:

• Хорошо, что...

This is very standard with clauses introduced by что.

Договорились is the past tense plural form of договориться.

It means:

• to come to an agreement
• to agree on something
• to settle something by agreement

So here мы договорились means we agreed or we came to an agreement.

It is not the same as simply we spoke or we discussed. It implies a result: the agreement was reached.

Because договорились is perfective, and this sentence focuses on the completed result.

Compare:

• мы договаривались = we were agreeing / we were negotiating / we had discussions
• мы договорились = we reached an agreement

In this sentence, the important idea is that the matter is settled, so договорились is the natural choice.

The -сь is the reflexive ending (short form of -ся).

In договориться, it does not mean a literal reflexive action like wash oneself. Instead, it is just part of the verb and helps form the meaning to reach an agreement with each other.

So:

• договорить = to finish saying something
• договориться = to come to an agreement

These are different verbs with different meanings.

After the preposition о (about, concerning), Russian normally uses the prepositional case.

So:

• о чём? = about what?
• о времени = about the time

That is why it is not о время, but о времени.

Also, время is an irregular noun, so its forms are a little special:

• nominative: время
• prepositional: о времени

Because the whole phrase is inside the prepositional phrase о времени встречи.

The head noun is время:

• base form: время встречи = the meeting time / the time of the meeting

But after о, время changes to the prepositional case:

• о времени встречи = about the meeting time

So only время changes because of о.
встречи stays in the genitive because it means of the meeting.

Because время встречи means the time of the meeting.

In Russian, one noun often modifies another by using the genitive case:

• время встречи = time of the meeting
• день рождения = day of birth = birthday
• центр города = center of the city

So here:

• время = time
• встречи = of the meeting

Then the full phrase becomes:

• о времени встречи = about the time of the meeting

Yes, often it could be omitted if the subject is clear from context.

Russian frequently drops subject pronouns when they are understood:

• Хорошо, что договорились о времени встречи.
• Хорошо, что мы договорились о времени встречи.

Both are possible.

Including мы makes the subject more explicit and can add a bit of emphasis or clarity.

The given word order is the most neutral and natural:

• Хорошо, что мы договорились о времени встречи.

Russian word order is flexible, but changing it changes the emphasis. For example, you could move things around in conversation, but some versions sound marked or less natural.

The standard order here is best for learners because it clearly shows:

1. the reaction: Хорошо
2. the clause introduced by что
3. the action: мы договорились
4. the topic of agreement: о времени встречи

This verb is very commonly used with о + prepositional when you mean agree on/about something:

• договориться о времени
• договориться о встрече
• договориться о цене

So in this sentence:

• договорились о времени встречи = agreed on the meeting time

You may also see other patterns with this verb in different meanings, but договориться о чём-то is the standard one for reaching agreement on a topic.

No, not in the same meaning.

• о времени встречи = about the time of the meeting
• на встречу = to the meeting / for the meeting

So if you said мы договорились на встречу, that would mean something closer to we arranged a meeting or we agreed to meet, not we agreed on the meeting time.

The original sentence is specifically about settling the time, so о времени встречи is the correct phrase.