If cheap domestic flights aren't getting you excited, booking a trip to Scandinavia should do the trick.
Scott's Cheap Flights found super cheap round-trip flights from major airports across the U.S. to Stockholm for travel from September through March of next year starting at $302 — but it gets better. T+L found flights from cities including New York starting at $296.
Related: Where to Eat, Drink and Play in Stockholm
Fly from Boston to Stockholm for as little as $300 round-trip, from New York City from $296, or from Los Angeles from $351.
Cheap flights are also available from Chicago, Denver, Las Vegas, Miami, and Washington D.C. If none of those are your home airport, check fares to Stockholm anyway — you might find a deal if you're flexible on travel dates.
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Some of the cheapest fares are on WOW Air (no surprise there), but other airlines including United, Icelandair, Swiss, and Air Canada also have cheap fares available.