Hungarian Natasa Douchev-Janics won her semi-final, while the New Zealander Lisa Carrington, 23, also qualified well.
Douchev-Janics, 30, warned her rivals she was aiming for a gold medal to go with the silver she won in the Kayak Double earlier in the week.
She said: 'I still have some spare for the final. I wouldn't say that this was not a full race, but now I'll go back to paddle and practice the few strokes that I have to.
'If I win the race tomorrow, then I'll be satisfied.'
Meanwhile, tomorrow's men's Canoe Single (C1) 200m final is likely to be a straight contest between France's Mathieu Goubel and Germany's Sebastian Brendel.
Goubel who missed out in the final of the men's 1000m, said he wanted to 'make things right'.
He said: 'I put all my anger into this race. I was disappointed after not making the final in the 1000m.'
I put all my anger into this race. I was disappointed after not making the final in the 1000m.Mathieu Goubel
In the men's Kayak Double (K2) 200m, it was the Russians who dominated.
Yury Postrigay and Alexander Dyachenko beat the British pairing of Liam Heath and Jon Schofield into second, while in the other semi-final Raman Piatrushenka and Vadzim Makhneu qualified in first.
The only upset of the day came in the men's Kayak Single (K1) 200m, where Piotr Siemionowski finished sixth and did not qualify for the final.
The 24-year-old was seen as potential rival to Great Britain's Ed McKeever, who is one of the favourites to claim gold.
Also competing in the women's K1 heats was 17-year-old Iranian Arezou Hakimimoghaddam, who told how she had to take up kayak instead of swimming to compete at the Olympics.
She trained for six years as a swimmer in women-only pools but rules in Iran prevented her from stripping down to a swimsuit in front of men, as she would have had to do at the Games.
The youngest Olympian to compete at Eton Dorney this week donned a hijab and wetsuit as she came seventh in her heat - not enough for the finals.
Speaking afterwards, she said: 'I am very happy to be here in London representing Iran. It was a good result for me and also for Iran that we have two people in the kayak and also in the rowing.'