How to save money on flights: what works, what is folklore

Flight advice is unusually full of folklore. Some of it was true a decade ago. Most of it never was.

What follows is ranked by how much it changes the number you pay, starting with the myths so you can stop spending attention on them.

Stop doing these

Incognito mode does nothing. Sophia Lin, a director of product management for travel at Google, told Travel + Leisure in June 2025 that incognito mode, browsing history, search history and switching devices do not affect the prices shown in Google Flights. Prices move because seat inventory and demand move. The reason the myth survives is that fares on busy routes change often enough that anyone who searches twice will eventually see two different numbers, and a story about surveillance is more satisfying than a story about fare buckets.

There is no magic booking day. “Book on a Tuesday” comes from an era when airlines filed fare changes on a weekly cycle. That is not how fare distribution works now. The day you buy is close to irrelevant. The day you fly is not, which is a different claim entirely and one of the few pieces of folklore with something behind it.

Waiting for a “sale” is not a strategy. Nothing requires a fare labelled as a sale to be lower than the route’s ordinary price, and most are not. That is the whole subject of why most flight deals are not deals.

What actually moves the number

1. Be flexible on dates before anything else. This is the largest lever available to an ordinary traveller and it is not close. Shifting a departure by one or two days, especially away from Friday and Sunday, routinely changes the fare by double-digit percentages. Every serious flight search tool has a flexible-date grid or a cheapest-days view. Open it before you commit to a date, not after.

2. Check both ends of the route. Second airports are frequently cheaper, sometimes by a wide margin, and the effect is strongest where a low-cost carrier operates from a secondary field. Run the search from each airport near you and into each airport near your destination. This costs five minutes and regularly finds more than every other tip on this list combined. The mechanism, and which named metros it applies to, is in two airports, forty miles apart, and a $300 gap.

3. Know what you are comparing against. A price only means something relative to what the route normally costs. $620 is either excellent or poor depending entirely on the route, and there is no universal good number. Ten minutes with a flexible-date calendar gives you a range you trust, and after that every fare you see is instantly readable. The full method is in how to tell if a flight price is good.

4. Decide your number before you start looking. Panic-booking the first fare that looks passable, and regret-booking a countdown-timer “deal,” are the same error pointing in opposite directions. Pick a price you would be content to pay before you open a search, and hold that line in both directions.

5. Price the whole ticket, not the fare. On low-cost carriers the headline number is a component, not a total. Add a cabin bag, a seat, and whatever the payment fee is, on the exact itinerary you would actually book. Do this before concluding that the budget option is cheaper, because reasonably often it is not.

6. Consider two one-ways. Especially on longer trips, and especially when mixing carriers. The saving is real when it appears. The cost is that two separate tickets are two separate contracts, so a delay on the first does not obligate anyone on the second.

7. Book economy fares directly with the airline. Not for the price, which is usually identical, but for what happens afterward. Changes, cancellations and disruption handling are all simpler when there is no intermediary, and the US 24-hour refund rule does not apply to bookings made through third-party agents.

8. Watch for mistake fares, and move fast. Every so often a fare gets loaded wrong and a route sells for a fraction of its normal price. These are corrected within hours. They reward whoever was already watching, never whoever searched hardest afterward, and there is more on them in how mistake fares work.

The part none of this fixes

Every item above requires you to go and do it, repeatedly, for each route you might fly.

That is the thing flight advice consistently skips. The tips are sound. Somebody still has to apply them, on a schedule, for every trip they would consider taking, indefinitely. Nobody does. Not because the advice is hard, but because doing it forty times a year for six possible trips is a part-time job with no salary.

Flydar takes over that last part: you describe the routes once, and the “is this below normal for this route” test runs on your behalf, with an email only when the answer is yes.

The short version

• Flexible dates first. Everything else is secondary.
• Check every airport at both ends.
• Establish the route’s normal range before you judge any fare.
• Pick your number in advance and hold it.
• Price the total, including bags and fees.
• Book direct.
• Ignore anything with a countdown on it.