1 adult Total: USD 243.80 On Travelocity:

Flight: KLM Airlines flight 1152 on a Boeing 737 Jet
Depart: Gothenburg, Sweden (GOT)- Sun, Sep 26 6:55am
Arrive: Amsterdam, Netherlands (AMS) - Sun, Sep 26 8:25am

Flight: KLM Airlines flight 1163 on a Boeing 737 Jet
Depart: Amsterdam, Netherlands (AMS)- Sat, Oct 02 7:50pm
Arrive: Gothenburg, Sweden (GOT) - Sat, Oct 02 9:15pm

Throw away the return segment on the above ticket and the following ticket.

1 adult Total: USD 334.80

Flight: Scandinavian Airlines flight 550 on a McDonnell Douglas MD80 Jet
Depart: Amsterdam, Netherlands (AMS)- Mon, Sep 27 6:45am
Arrive: Copenhagen, Denmark (CPH) - Mon, Sep 27 8:05am

Flight: Scandinavian Airlines flight 430 on a McDonnell Douglas MD90 Jet
Depart: Copenhagen, Denmark (CPH)- Mon, Sep 27 8:45am
Arrive: Gothenburg, Sweden (GOT) - Mon, Sep 27 9:30am

Flight: Scandinavian Airlines flight 1439 on a McDonnell Douglas MD80 Jet
Depart: Gothenburg, Sweden (GOT)- Tue, Oct 05 6:50am
Arrive: Copenhagen, Denmark (CPH) - Tue, Oct 05 7:35am

Flight: Scandinavian Airlines flight 547 on a McDonnell Douglas MD80 Jet
Depart: Copenhagen, Denmark (CPH)- Tue, Oct 05 9:15am
Arrive: Amsterdam, Netherlands (AMS) - Tue, Oct 05 10:35am



There are cheaper options too, but it requires playing with the dates or going on the LCC airlines.

Depending on your time flexibility on the return, leaving the 25th and returning on the 27th on KLM is 243.80 all included on KLM with non-stop flights.