Whales are seen in the feeding grounds of Antarctica after long migrations from warmer water where they breed. The best time to watch them is from February to March. Whales are too busy feeding to spend time entertaining us any earlier, although you will see them.
In the Arctic, whales are wary of the sound of engines, so they are harder to encounter than in Antarctica. The species are different too - narwhal and beluga are found only in the north.