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For the Cheapest Airfares, Don't Shop on Sundays

It’s the age-old question that bedevils airline travelers: Is this a good fare? The Internet is rife with advice on when to buy and when to fly, a mix of maxims that frequently serves to confuse fare shoppers more than they enlighten: Buy on Tuesdays! Avoid Friday flights!

We have another. (You knew this was coming.) The latest fare study, by a Boston-area travel-tech startup called Hopper, found that Thursday is the cheapest day to purchase a ticket, with weekends the worst. The best fares were found for Wednesday departures, while returns were cheapest on Tuesday for domestic flights and on Wednesday for international trips. Friday was the most expensive day to fly home both domestically and abroad, likely because Friday and Sunday are two of the heaviest traffic days for airlines worldwide.