Here are some of the most convenient flight search engines:
Tips for booking:
Once you’ve found the flight you want, always compare the price shown on the search engine with the price on the airline’s official website. Sometimes it’s significantly cheaper to book directly. Even if the difference is small, it’s usually better to buy from the airline directly — it will be easier to resolve issues like cancellations or delays.
Also compare prices between search engines themselves — the same flight can differ by tens or even hundreds of dollars.
Prices can vary depending on the device you're using: mobile vs desktop, Android vs Apple.
Changing your location settings or country of residence in the search engine can also affect the price.
The rule “the earlier you book, the cheaper the ticket” still holds true.