But it was the home team Hammarby who took the lead.
Emma Westin ran deep, looked up and found Matilda Vinberg slanted backwards after 12 minutes of play.
For Vinberg, it was just a matter of shaving 1-0 to "Bajen".
The Stockholm team looked to step out of the first half with a lead - but three minutes before the break whistle Häcken equalized.
Anna Csiki found Stine Larsen with a nice insert and Larsen sent, from close range, the receipt.
Extension
None of the teams managed to get into a net mess in the second half, but the cup semi-final had to be decided in extra time.
In the second overtime quarter, Julia Karlernäs served Johanna Rytting Kaneryd in depth.
Rytting Kaneryd made no mistakes when she came free but rolled cold in 2-1 for visiting Häcken from Hisingen.
A few minutes later, Häckens Csiki received his second yellow card - and thus left the field.
But despite the expulsion, Hammarby did not manage to get a draw, get a penalty - without Häcken, reigning cup champion, won 2-1 and is ready for the cup final.
"A receipt"
-I had been on my whole team and said that: "Hit the ball in depth and I will run".
It was just running and so I put it there, says Rytting Kaneryd to C More and continues:
-We are not happy with how the game looked today, but to win and go to the final in the Swedish Cup is a proof that we are on track.
In the second semifinal, Rosengård and Eskilstuna United will meet, that match will be played tomorrow, Sunday.
The final will be played on 26 May.