WOW Air is having another sale, with cheap flights to Iceland starting at $99 one-way, or $198 round-trip. If you haven't been to this popular northern destination yet, here's a chance to get a great deal.

The cheapest fares to Reykjavik are available from New York City, Boston, Pittsburgh, Cleveland, Cincinnati, Detroit, Chicago, and Washington, D.C. The cheapest travel dates vary by origin airport, and are available throughout the year.

If your dates are flexible, you can likely find a $198 round-trip flight, however even without a lot of flexibility, there are good deals in the $240-$340 price range.

WOW Air is a budget airline, meaning passengers must always be careful to check extra fees for any services they may want, like checked baggage or in-flight meals. (But then, what airlines don't have you worrying about extra fees nowadays?)

Once you're in Iceland, there's lots to do — in the winter, you can go hunting for the Northern Lights or spend some time at the spa. In the summer, Iceland offers up to 21 hours of daylight, making a road trip around the Ring Road or a hike to a waterfall appealing activities.