Αν όλα πάνε καλά, θα αναχωρήσουμε στην ώρα μας.

Here αν means if.

In this kind of future condition, Greek normally uses:

• αν
  • verb in the if-clause
• θα
  • verb in the main clause

So:

• Αν όλα πάνε καλά = If all goes well
• θα αναχωρήσουμε στην ώρα μας = we will depart on time

A very common learner mistake is trying to say Αν όλα θα πάνε καλά. In standard Greek, that is not how this pattern works. You usually do not put θα after αν in this kind of sentence.

Πάνε is from the verb πάω / πηγαίνω, which means to go.

Here it is the 3rd person plural form: they go.

So literally:

• όλα πάνε καλά = all things go well

In natural English, that becomes everything goes well or all goes well.

This expression is extremely common in Greek:

• Όλα πάνε καλά. = Everything is going well.

Yes. Όλα is literally all (things), so it is grammatically plural.

Greek often says όλα where English would simply say everything.

So:

• όλα = all things / everything
• όλα πάνε καλά = everything is going well

This is very natural Greek, even though English prefers a singular-looking word like everything.

No. It is not past tense here.

Modern Greek forms the future with θα + a special verb form. In this sentence:

• θα αναχωρήσουμε = we will depart

The form αναχωρήσουμε is the perfective non-past form used after words like θα, να, and αν.

It may look a bit like an aorist-related form, but in this sentence it clearly refers to the future because of θα.

Why this form and not αναχωρούμε?

Because the departure is seen as a single complete event:

• θα αναχωρήσουμε = we will depart
• θα αναχωρούμε would suggest something habitual or repeated, which does not fit here

Both can relate to leaving, but αναχωρώ is more formal and more specifically means depart.

So:

• αναχωρώ = depart
• φεύγω = leave / go away

αναχωρώ is especially common for:

• flights
• ships
• trains
• organized or scheduled departures

That makes it a very good choice here, because the sentence sounds like a planned departure.

A more everyday version could be:

• Αν όλα πάνε καλά, θα φύγουμε στην ώρα μας.

That is also natural, but slightly less formal.

Literally, στην ώρα μας means at our time.

But idiomatically, it means:

• on time
• at our scheduled time

The μας means our, because the sentence is about our departure. So the idea is:

• we will depart at our proper/scheduled time

In English, we usually just say on time, without the possessive. Greek often uses this kind of structure more explicitly.

Στην is the contracted form of σε την.

So:

• σε + την = στην

This contraction is completely normal and very common in everyday Greek.

For example:

• στην πόλη = in/to the city
• στην ώρα μας = at our time / on time

You should think of στην as the usual form in natural speech and writing.

Because καλά is the normal everyday adverb here.

In Modern Greek, καλά is very commonly used to mean well, especially in ordinary speech and in fixed expressions like:

• Είμαι καλά. = I’m well / I’m fine.
• Όλα πάνε καλά. = Everything is going well.

Καλώς does exist, but it is more formal or appears in set expressions such as:

• Καλώς ήρθατε. = Welcome.

So in this sentence, καλά is the natural choice.

Yes, you could, but it is not the most natural version here.

• Αν όλα πάνε καλά is the usual, idiomatic phrase.
• Αν όλα πηγαίνουν καλά is understandable, but it sounds a bit more like an ongoing process and a bit less fixed as an expression.

Greek often prefers πάω in this phrase:

• Όλα πάνε καλά.

So for a learner, the safest and most natural version to remember is:

• Αν όλα πάνε καλά, θα αναχωρήσουμε στην ώρα μας.

Yes. Greek word order is more flexible than English.

You could also say:

• Θα αναχωρήσουμε στην ώρα μας, αν όλα πάνε καλά.

This means the same thing:

• We will depart on time, if all goes well.

The original version puts the condition first, which is very common:

• If all goes well, we will depart on time.

So the choice is mostly about emphasis and style, not a major change in meaning.