Det blev inget byte i dag, eftersom samma försening påverkade hela resan.

In Swedish, det blev is a very common way to describe an outcome or what ended up happening.

Here, det blev inget byte means something like:

• there was no transfer/change
• it ended up not requiring a transfer
• it turned out that there was no transfer

The det here is an impersonal subject, similar to English it in it rained or it turned out fine.

The verb blev is the past tense of bli, which often means:

• become
• get
• turn out

So det blev often has the sense of it turned out / there ended up being rather than simply it was.

Because byte is an ett-word in Swedish: ett byte.

The negative forms agree with the gender of the noun:

• ingen for en-words
• inget for ett-words
• inga for plural nouns

So:

• en resa → ingen resa
• ett byte → inget byte
• förseningar → inga förseningar

That is why inget byte is correct.

Inget byte means no transfer/change or not any transfer/change.
This is the normal way to negate a noun phrase.

Swedish usually uses ingen / inget / inga before nouns, not inte.

Compare:

• Det blev inget byte. = There was no transfer.
• Det blev inte bra. = It didn’t turn out well.

So:

• inte usually negates verbs, adjectives, or whole clauses
• ingen / inget / inga usually negates nouns

In this sentence, byte most likely means a change or transfer during a journey, such as changing:

• trains
• buses
• lines
• connections

So inget byte means no transfer / no change of vehicle.

The noun byte can also mean other kinds of change or exchange in different contexts, but in travel-related sentences it very often refers to a transfer.

I dag is a time expression meaning today.

It is very common to write it as two words: i dag.
You may also see idag written as one word. Both occur, but i dag is often preferred in more careful or traditional writing.

For a learner, the important thing is that both mean the same thing:

• i dag = today
• idag = today

Eftersom means because or since.

It introduces a reason:

• Det blev inget byte, eftersom samma försening påverkade hela resan.
• There was no transfer, because the same delay affected the whole journey.

Learners sometimes confuse eftersom with för att:

• eftersom = because
• för att can mean in order to, and sometimes also because in informal usage

In a sentence like this, eftersom is very clear and natural for giving a reason.

Yes. Eftersom introduces a subordinate clause, and subordinate clauses in Swedish follow different word-order rules from main clauses.

In this particular sentence, the difference is not very obvious because there is no sentence adverb like inte, alltid, or ofta. But the clause is still subordinate:

• eftersom samma försening påverkade hela resan

A useful rule is:

• in a main clause, the finite verb is usually in second position
• in a subordinate clause, sentence adverbs normally come before the finite verb

For example:

• Main clause: Samma försening påverkade inte hela resan.
• Subordinate clause: ... eftersom samma försening inte påverkade hela resan.

So yes, eftersom does affect the grammar, even if this sentence does not show the most obvious example of it.

In Swedish, samma usually comes directly before the noun, and the noun is usually in its indefinite form:

• samma dag = the same day
• samma problem = the same problem
• samma försening = the same delay

So samma försening is the normal pattern.

English speakers sometimes expect something more like the same delay, with a separate definite marker, but Swedish does not usually do that here.

Påverkade is the past tense of påverka, which means to affect, to influence, or to impact.

So:

• påverka = infinitive
• påverkar = present
• påverkade = past
• påverkat = supine / past participle-related form in compound tenses

In this sentence, påverkade simply means affected.

Because hela often goes with a definite noun when you mean the whole ...:

• hela dagen = the whole day
• hela veckan = the whole week
• hela resan = the whole trip/journey

So hela resan means the whole journey.

This is a very common Swedish pattern:

• hela
  • definite singular noun

You do not normally say hela resa here.

The det does not refer to a specific thing like it often does in English. Instead, it is an impersonal or formal subject.

Swedish often uses det in sentences about:

• weather
• time
• general situations
• what happened or turned out to be the case

Examples:

• Det regnade. = It rained.
• Det blev sent. = It got late.
• Det blev inget byte. = There was no transfer / It turned out there was no transfer.

So this det is mainly there because Swedish grammar wants a subject in the sentence.

Yes. Resa is a broad word and can often be translated as:

• trip
• journey
• travel

In this sentence, hela resan could naturally be understood as:

• the whole trip
• the whole journey

The best English choice depends on context, but the Swedish word itself is flexible.

The comma here is a punctuation choice separating the main clause from the reason clause:

• Det blev inget byte i dag
• eftersom samma försening påverkade hela resan

In Swedish, commas before subordinate clauses are often more optional than in English, especially in shorter sentences. So you may see both:

• Det blev inget byte i dag, eftersom ...
• Det blev inget byte i dag eftersom ...

Both can be acceptable, depending on style and clarity. The comma is not the most important thing for understanding the grammar.