Basic fares for transatlantic WOW air flights are usually really low an include only a flight ticket and one small personal bag with dimensions 42x32x25cm and weight up to 10 kg. You need to pay extra for everything else: a normal size carry-on, checked baggage, seat reservation etc. Note that there is also no meal service unless you book Wow Premium fare, pre-order meal or buy snacks on board.
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While many theories exist around booking specifically on a Tuesday to save money, the reality is there is no consistent truth to exactly which days are cheapest to fly. Most of the time it is cheaper to leave on a weekday, though this isn't always the case. Your best strategy is to get a quick visual of prices for a whole month to see what days are cheapest for your specific route. Here's how: