Compare prices online using accurate and fair search engines. Finding the cheapest flights requires a rigorous search involving multiple search engines and airlines. However, many airfare search engines are actually owned or operated by major airlines, meaning unbiased searches are off the menu. Rather than sticking to search engines you see advertised on television, look for search engines that hunt down the cheapest fares among large airlines and small ones alike.
If your country’s currency is currently strong compared to others around the world, search airfare in a country where the currency is weaker. For example, the US dollar is strong and the New Zealand currency is weak. I found a one-way flight from Australia to NYC for $1,000 USD but when I searched on the NZ version of the airline, I found the same ticket for $600 USD. It’s the same airline, same flight, and same booking class. It was just booked in a different currency. This tip does not always work, but it works often enough that it’s something worth trying if your currency is currently doing well.
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In Google Chrome or Safari, incognito is enabled by hitting Command (or “Control” if using PC), Shift, “N”. For Mozilla Firefox or Internet Explorer, hit Command (or “Control” if using a PC), Shift, “P”. This will open a new browser window where your information is not tracked, thus not inflating prices as you search. Note: if you're using an older version of OS X, open Safari then click “Safari” in the menu bar, and select “Private Browsing”.