For years travellers swore by a simple trick: buy plane tickets on a Tuesday afternoon and you pay less. Google’s own flight data now shows the day you book barely matters. What saves real money is the day you fly and how far ahead you buy.

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Here is what the numbers say, and a simple routine for finding a good fare without watching the screen all week.

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The Tuesday booking myth, tested

In September 2024 Google Flights published an analysis of several years of its booking data. As summarised by Thrifty Traveler, Tuesday has historically been the cheapest day to book, but only by about 1.3 percent compared with Sunday, the most expensive. On a €300 ticket, that is about four euros.

Airline fares move with demand and with how many seats are left on a flight, so there is no weekly magic hour to wait for. If a fare fits your budget and your dates, waiting for Tuesday will not change much.

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The cheapest days to fly

The day of departure makes a much bigger difference. Google’s data showed that flights on Monday, Tuesday and Wednesday were about 13 percent cheaper than flights from Friday to Sunday. On US domestic routes the gap was about 20 percent.

If your dates can move by a day or two, check the date grid or price graph in your search tool and shift the trip to the middle of the week.

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How far ahead to book flights

Timing your purchase still counts, measured in weeks, not hours. Google Flights found that fares were usually lowest:

  • US domestic flights: 21 to 52 days before departure, about 38 days on average.
  • Summer domestic trips (July and August): 13 to 44 days ahead, lowest around 21 days.
  • Christmas travel: 36 to 72 days ahead, best around 58 days.
  • Mexico and the Caribbean: 26 to 68 days ahead, lowest around 44 days.
  • Europe: around 94 days, roughly three months, ahead.

The figures are averages for travel from the United States, but the pattern holds widely: long-haul and peak-season trips reward booking early, while short domestic hops leave more room.

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Let price alerts do the watching

Google Flights price tracking monitors a route or a single flight for you. Set your airports, cabin and number of travellers, then switch on Track prices. If your dates are flexible, choose Any dates and Google emails you when the route’s minimum price drops significantly over the coming months. Alerts also warn when prices are likely to rise or when a current fare is about to expire.

Airline newsletters and loyalty programmes are worth joining for routes you fly often, since that is where sales are announced.

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Compare the total cost, not the headline fare

A cheap ticket can become expensive at checkout. Before you pay, check:

  • Baggage: is a cabin bag or checked bag included?
  • Airport: a distant secondary airport can add a long transfer or a taxi.
  • Connections: are all flights on one ticket, so the airline rebooks you if you miss a connection?
  • Change and refund rules: a flexible fare can be worth it if plans may move.
  • Seats: families who want to sit together may pay extra on basic fares.

Once booked, check the names on the ticket straight away, and be careful when sharing travel photos: our boarding-pass privacy guide explains why. For the opposite of careful planning, read about Jamie Ather's accidental Brazil booking.

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Sources