Norse Atlantic Airways is putting flights to Europe on sale for up to 15 percent off just in time for Halloween.

The scary-good deal must be booked by 7 p.m. ET on Nov. 2, or until it’s sold out, Norse Atlantic shared with Travel + Leisure. The sale is then valid for travel from Nov. 15 to March 31, 2025.

To take advantage, travelers can use the promo code “TREAT24” for up to 15 percent off select routes.

“Whether you’re seeking a winter getaway in the UK or an adventure in Norway, a cultural escape in Paris, a foodie’s delight in Italy, or a journey through the ancient wonders of  Greece, we have exclusive sale fares across our network — without compromising on quality or comfort,” Bård Nordhagen, the chief commercial officer at Norse Atlantic, said in a statement shared with T+L.

Save big on trips from New York to Berlin, London, Oslo, Rome, and Paris, or from Miami to Berlin or London. Norse Atlantic is also discounting routes like Las Vegas to London and Orlando to London.

However, while this deal is mostly treat, there is a bit of a trick too: the sale is not valid on blackout dates from Dec. 20 to Jan. 6, 2025. The savings also vary by the type of fare booked with Light fares eligible for 5 percent off, Classic fares eligible for 10 percent off, and Flextra fares eligible for 15 percent off.

Norse Atlantic was founded in 2021 and now operates a fleet made exclusively of Boeing 787 Dreamliner aircraft. The airline flies to several cities in the United States, including New York, Los Angeles, Miami, Orlando, and Las Vegas.

Onboard, travelers have a choice between two cabins: economy and premium, which features a 43-inch seat pitch.

Recently, Norse Atlantic started including 22-pound carry-on bags in its Economy Light fares when the flight is booked directly on the airline’s website.