Jag funderar på om bussen är försenad igen.

Because fundera på is a very common expression in Swedish meaning to think about, to wonder about, or to consider.

• Jag funderar by itself can exist, but it feels incomplete in many everyday contexts.
• Jag funderar på om... means I’m wondering whether...

So in this sentence, på belongs naturally with funderar.

Here, om means whether or if.

It introduces an indirect yes/no question:

• Är bussen försenad? = Is the bus delayed?
• Jag funderar på om bussen är försenad. = I’m wondering whether the bus is delayed.

So this om is not the same as the om that can mean about or if in other situations. Here it specifically introduces the idea of uncertainty: whether the bus is delayed.

Because after om, this becomes an indirect question, not a direct question.

Compare:

• Direct question: Är bussen försenad?
• Indirect question: ...om bussen är försenad

In Swedish, indirect questions usually use normal statement word order:

• subject + verb
• bussen är

So even though English also changes this in a similar way, it is important to notice that Swedish does too.

Bussen is the definite form of buss, meaning the bus.

• en buss = a bus
• bussen = the bus

The sentence is talking about a specific bus that the speaker has in mind, not just any bus. For example, maybe it is the bus they are waiting for or normally take.

This is very typical in Swedish: the definiteness is often added as an ending:

• en bok → boken
• en buss → bussen

Försenad means delayed.

For transport, it is often better translated as delayed rather than just late:

• Bussen är försenad = The bus is delayed

A person can be sen (late), and a bus can also be sen in some contexts, but försenad is especially common for things like buses, trains, flights, deliveries, and schedules.

Igen means again.

So the sentence is not just saying the bus may be delayed — it suggests this has happened before:

• Jag funderar på om bussen är försenad. = I’m wondering whether the bus is delayed.
• Jag funderar på om bussen är försenad igen. = I’m wondering whether the bus is delayed again.

This often adds a slight feeling of annoyance, surprise, or resignation.

Putting igen at the end is the most natural position here.

Swedish often places words like igen late in the clause:

• Bussen är försenad igen.

That makes igen modify the whole situation: the bus is delayed again.

Other word orders may be possible in special contexts, but this final position is the normal and easiest one for learners to use.

They are similar, but not always identical.

• Jag undrar om... = I wonder if / whether...
• Jag funderar på om... = I’m thinking about / I’m wondering whether...

Undrar often sounds a bit more direct and natural for a simple question in your mind.
Funderar på can sound a bit more reflective, like you are thinking it over.

In many everyday situations, both are possible:

• Jag undrar om bussen är försenad igen.
• Jag funderar på om bussen är försenad igen.

The second can feel slightly more like I’m sitting here thinking about it.

Swedish uses the simple present where English often uses the present progressive.

So:

• Jag funderar literally = I think / I wonder
• but naturally in English it is often translated as I’m wondering

This is very normal. Swedish does not use a special -ing form the way English does.

So Jag funderar på om bussen är försenad igen is perfectly natural Swedish for what English might express as I’m wondering whether the bus is delayed again.

Yes. In this sentence, both if and whether are possible in English.

• I’m wondering if the bus is delayed again.
• I’m wondering whether the bus is delayed again.

Whether is sometimes a bit more formal or precise, but if is very common in everyday English. The Swedish word om covers this use.

Yes, it is a complete statement.

The main clause is:

• Jag funderar på = I’m wondering / thinking about

Then it is followed by a subordinate clause:

• om bussen är försenad igen = whether the bus is delayed again

So the whole sentence is not a direct question to another person. It is a statement about the speaker’s thoughts.

That is why it ends with a period, not a question mark.