How to book the best cheap flights

1. Keep your searches top secret
   You're not crazy for thinking that a flight price has changed after searching it a few times in your web browser. Based on the cookies in your browser, flight prices do increase when a particular route is repeatedly searched, as the site wants to scare you into booking the flight quickly before prices get even higher. Always search for flights in incognito or private browsing mode to see the lowest prices.

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”.

Your cookies are reset each time you re-open an incognito window. So if you want to start with a clean slate for each flight search (so your previous searches aren't “remembered”, potentially inflating costs), close all your incognito windows, open a new one, and then perform your flight search.

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1. Use the best flight search engines
   All search engines have inflated flight costs as part of taking a cut from the airlines. Some search engines (e.g. Expedia) consistently inflate much higher than others (listed below). It pays to familiarise yourself with sites that offer the best prices.

Use These to Book
Skyscanner (or download the app) (our #1 choice)
AirFare Watchdog (good at finding sale & error fares – see tip #8)
Momondo (a broad search engine that sometimes shows cheaper fares than Skyscanner)
Kiwi.com (combines all airlines to create routes that are cheaper than booking with just 1 airline – see tip #5)

Cheapoair
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AirWander (lets you extend layovers into stopovers to visit 2 destinations with 1 trip – see tip #5)
JetRadar (includes budget airlines, which many search engines don't)
Google Flights (good tool to quickly compare flight dates – not usually the best prices)
As of 2018, most budget airlines will now appear in the broad search engines we are recommending. If you want to be 100% sure though, you can do an additional search for regional budget airlines (we've listed as many we know of further below).

Finally, no single search engine is consistently perfect (though we find Skyscanner to be the best). As such, you may need to try a combination of search engines to ensure you're not missing any results. There doesn't seem to be one that gets the cheapest flight 100% of the time.

1. Identify the cheapest day to fly out
   While many theories exist around booking specifically on a Tuesday to save money, the reality is there is no consistent truth to exactly which days are cheapest to fly. Most of the time it is cheaper to leave on a weekday, though this isn't always the case. Your best strategy is to get a quick visual of prices for a whole month to see what days are cheapest for your specific route. Here's how:

Step 1. Hop on the Skyscanner website or download the app

Step 2. Enter your departure & arrival cities

Step 3. Select “one-way” (even if flying round trip – you're just determining the cheapest days to fly out first)

Step 4. On a computer: click “Depart” but instead of entering a date, select “Whole Month”, and then “Cheapest Month” so you can browse all dates to see which is cheapest. Hit “Search flights” to easily see which date is cheapest.

In the mobile app: Tap the departure date, then change the view to “Chart”. You can easily swipe left and right to find the cheapest date, and tap on one of the bars to see the price.

Repeat these steps for your return flight if applicable. You can still book a round trip in one booking, but doing these steps first will let you see which dates are generally cheaper to fly in/out on for your round trip.

Kiwi.com and Google Flights work similarly to Skyscanner, plus they have map views as well, so you can see where the airport is. For tracking when and where is cheapest to fly, Hopper also offer price analysis and track fluctuations (i.e. when is best to fly).

1. Befriend budget airlines
   Budget airlines offer significantly cheaper tickets than their full-service counterparts. It should be obvious, but this comes with compromises such as less leg room and no “free” food/drink on-board (which by the way, is normally covered in your higher-priced ticket with full-service airlines).

If you are considering flying budget, which in our opinion is a great way to save, I'd highly recommend reading our guide on 7 must-know facts about budget airlines.

Below is a comprehensive list of budget airlines around the globe. Red indicates true budget airlines while blue implies the cheapest companies available where budget airlines don't exist or aren't plentiful.

But First… A NOTE ON BOOKING BUDGET AIRLINES. Always read the fine print and do the following:

Check where the airport location is (some budget airlines fly to airports further out of town).
Ensure you've booked & paid for your luggage allowance. Adhere to restrictions on weight, height, and # of bags allowed. Some airlines (e.g. Ryanair) will charge hefty fee if you're over. Remember, paying only for the exact luggage space/weight you need is how budget airlines keep their prices lower than traditional airlines!
Read the fine print. The best example is that Ryanair WILL CHARGE A FEE if you do not print your own ticket or adhere to their strict luggage weight and dimensions. A warning of this fee is clearly stated in all capital letters in the first sentence of your e-confirmation. In a nutshell, always read and follow instructions!
Remember, if you want to book the cheapest flight possible (not service-of-the-year-award-winner), be adaptable, do your research, and know the budget airline's requirements & restrictions.