Booking Holdings owns and operates Kayak (stylized as KAYAK), an American online travel agency and metasearch engine. Kayak's website and mobile apps are available in over 18 languages and in over 30 countries, including the United States, the United Kingdom, Canada, etc. It's also a good place to start because it's a search engine.

Kayak evaluates costs from a variety of websites in one place so you can quickly determine which options are the most cost-effective. Most of the time, you'll be sent to a separate website to complete your reservation. Hacker prices on Kayak are a fantastic way to save money on your travel. Instead of a round-trip on a single airline, these itineraries are made by combining two one-way tickets (typically on separate carriers). These can be excellent bargains and something that doesn’t often found in other websites' search results.

Pros:

• Kayak hacker fares
• Price tracker to keep an eye on flight prices

Cons:

• When your trip plans are highly flexible, Kayak is the best option. Because many of their most useful tools assist you in finding bargains, this site may be less appealing if you have a certain flight in mind.

Website: https://www.kayak.com/

Google Flights is an online flight booking search engine that makes it easier to buy airline tickets through third-party vendors. It was launched by Google in 2011 following a buyout. It is now part of Google Travel

After you've found a flight, Google Flights will lead you to the airline's direct website or an online travel agency (OTA) to make your purchase. It's a strong search engine based on the ITA Matrix, which was designed for travel agencies in the first place. Google Flights shows price trends as well as how your trip date may affect the cost of your ticket. It also allows you to track the pricing of a route so that you can take advantage of reduced costs when they appear. These characteristics make Google Flights an excellent tool for ensuring that the price you're paying is reasonable.

Pros:

• Price Graph shows pricing trends for your route and allows you to determine which days are the most cost-effective to fly.
• When the price of your flight rises or falls, price tracking will send you an email.
• There are several filtering options available to help you customize your search.

Cons:

• Because this search engine is so powerful and has so many possibilities, it might be confusing for a first-time tourist.

Website: https://www.google.com/flights

Orbitz, which has been around since 2001, is another dependable option that is worth considering. Orbitz.com is a travel metasearch engine and price aggregation website. Orbitz Worldwide, Inc., a subsidiary of Expedia Group, owns the website. It is based in Chicago, Illinois, at the Citigroup Center.

One feature that sets this site apart is that it has its own rewards program, called Orbitz Rewards. When you book hotels, flights, and holiday packages with Orbitz, you may earn Orbucks. Orbucks, on the other hand, can only be redeemed for hotels. When you book a flight with Orbitz, you'll get 1% of the total cost back in Orbucks. If you buy a $500 airfare, you will receive 5 Orbucks, which can be used to book a hotel. It is completely free to join the Orbitz Rewards program.

Pros:

• Orbitz Rewards allows you to earn Orbucks, which you may use to book hotel rooms.
• There is a 24-hour cancellation policy in place.
• Low Price Guarantee: Orbitz will refund the difference if you discover a cheaper price for your flight on another website within 24 hours.

Cons:

• Orbitz frequently charges a reservation fee. Before completing your purchase, check for the cost on your trip summary page.

Website: https://www.orbitz.com/

Hotwire is an online travel agency that sells airline tickets, hotel rooms, auto rentals, and vacation packages. It makes money by selling unsold travel inventory at a discount.

The primary search box on the home page allows you to enter your departure and destination cities, as well as your intended trip dates. To access the flight search, go to the main search box and pick the third tab. When purchasing a hotel and a flight together, Hotwire may save you a lot of money. Many times throughout the booking process, you'll notice pop-ups or prompts offering big discounts if you book a hotel and a flight at the same time. You could come across a Hot Rate flight when looking for your flight. These are flights where the actual hours, number of stops, and airlines are not revealed until after you have completed your purchase.

Pros:

• Hotel package offers can save money, and there's a 24-hour cancellation period.
• Guaranteed Low Prices

Cons:

• Hotwire may impose a booking fee on occasion.
  
• Hot Rate flights don't always save you a lot of money.

Website: https://www.hotwire.com/

Momondo (stylized momondo) is a fare aggregator and metasearch engine for airfares. KAYAK, a part of Booking Holdings, manages momondo, which was launched in Denmark.

On the front page, you'll find a simple search box where you may enter your trip information. One of the things that are appreciated about this site is how it shows you the pricing trends for your flight in a really graphic way. At first look, it appears that you may save money by rearranging your vacation dates. On the left-hand side of the screen, it also has a price tracker and a variety of filtering choices. It also provides Mix & Match prices, which are just two one-way tickets from various suppliers blended to bring you the cheapest price. However, unlike other services, you must book these sorts of tickets through two different websites.

Pros:

• Excellent pricing tracking tools

Cons:

• When booking Mix & Match fares, you must make two separate bookings.

Website: https://www.momondo.com/