Step 5: Search your itinerary and convert the price to dollars
Now, find your desired flight on the local airline's site and note the cost in that currency. Also, make certain the flight is departing from your country of origin and not the other way around. Hate to accidentally book a ticket from Oslo to New York when you already live in Williamsburg.
Open a new window and, using this currency converter, determine if the local-currency fare is cheaper than the one your originally turned up on Kayak or Orbitz.
Step 6: Check the terms and conditions
BIG NOTE HERE: Some airlines are hip to your little scam and only let you pay in their country's currency with credit cards from that country. It’s not a common policy, but might take you by surprise. If you find that's the case, be prepared to abort the mission and/or wire your buddy in Oslo the cash.
Step 7: Book it!
Your credit card will convert the currency for you (after a small fee), and you’ll be all set. Congratulations. You've just successfully arbitraged your way (we think) to a cheaper airline ticket.
A final word of warning...
Though Tripdelta told us that it isn’t necessary, some people have reported needing to use a proxy server or VPN to make this work. Simply, the foreign airline website knows you're booking from the United States so you need to, in essence, make it think you're in Norway. At that point, it's up to you whether the savings are worth the added technical hassle of installing/setting up a VPN.
And finally, while some tickets are hundreds of dollars cheaper in other currencies, other times the savings can be nominal. So don't go in expecting a huge windfall. But if you’re the sort of person who enjoys spending your spare time looking for ways to save cash, this is definitely worth trying for your next trip overseas. If for no other reason than you’ll have something new to talk about with Mr. Arbitrage.
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Matt Meltzer is a staff writer with Thrillist. Follow him on Instagram: @meltrez1.