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<a href="https://www.makcorps.com/">MakCorps - Hotel Price Comparison API</a> 
1) Provides data from more than 200 OTAs like Booking, Expedia, Agoda, etc. 
2) Compare prices and provide JSON response with top&nbsp; cheapest vendors 
3) Search any city, any hotel of any country. 
4) FREE pack available with 420 requests per month. 
&nbsp;

Answer for How to get free travel APIs?

There are almost no absolutely free APIs in the travel industry. One way or another, you have to pay for product use. That said, you may enroll in affiliate programs to share commission fees with a provider or just try sandbox versions for your MVP. Here are some popular APIs that you can get kinda free or with shared fees.
<a href="https://sandbox.amadeus.com/api-catalog" target="_blank" rel="noopener">Travel Innovation Sandbox by Amadeus</a> 
Sandbox APIs include: flights, hotels, cars, trains, and points of interest. 
How? Just register, get your API key, and you’re good to go. 
Limitations: No commercial use. No more than 5 concurrent transactions and no more than 5,000 calls per user per month. 
Use cases: PoC, testing, student works.
<a href="https://developer.sabre.com/resources/getting_started_with_sabre_apis/how_to_get_a_token">API Explorer by Sabre</a> 
Flights, hotels, ground transportation, and cruises. Additionally, fare ranges, low fare forecasts and history, top flight destinations, and air travel seasonality. 
How? After you fill out the test API form, the Sabre account manager will contact you and provide you with a token. 
Limitations. No commercial use. You get access to REST APIs only, while Sabre also suggests a set of SOAP APIs. Depending on your profile, some APIs may not be available at all. 
Use cases: PoC, testing.
<a href="https://skyscanner.github.io/slate/?_ga=1.104705984.172843296.1446781555#api-documentation">Skyscanner API</a> 
The API includes info on flights. As soon as you generate over about $1300 worth of revenue per month, you can start earning. 
How? You directly request API access from Skyscanner. 
Limitations. Only info sourcing with no booking. They’ll vet you. Live flights calls are limited to 100 per minute, flights cache up to 500 per minute, car hire up to 100 per minute. 
Use cases: Metasearch startups.
<a href="https://opensky-network.org/apidoc/rest.html">OpenSky API</a> 
You get real-time flight and aircraft info. 
How? It’s open and can be used right away. 
Limitations. Noncommercial use. 
Use cases. PoC, student works, nonprofit projects.
<a href="https://developers.booking.com/api/commercial/index.html?version=2.2&amp;page_url=getting-started">Booking.com API</a> 
The API is mostly aimed at accommodations. You become their affiliate partner and <a href="https://affiliates-support.booking.com/hc/en-us/articles/115011981748-How-is-your-affiliate-commission-percentage-calculated-">receive part of the booking fee</a>. 
How? Apply for an affiliate program and receive your API access. 
Limitations. Booking will vet you. Some APIs may not be available and no more than 20 simultaneous API connections are allowed. 
Use cases. Accommodation booking. 
Very similar terms are available at <a href="https://partners.agoda.com/">Agoda Affiliate Program</a> as they belong to Booking Holdings.
<a href="https://developer.expediapartnersolutions.com/about/">Expedia Rapid APIs</a> 
The APIs are also aimed at accommodations. As with Booking.com, you get an affiliate fee. 
How? Apply for the affiliate program and receive your API access. 
Limitations. Each API has its limits of updates per message. Consult the FAQ at each API documentation for specifics. 
Use cases. Accommodation booking.
<a href="https://developer.ticketmaster.com/products-and-docs/apis/getting-started/">Ticketmaster APIs</a> 
Ticketmaster provides info about and ticket reservations for concerts and sport events. They have two open APIs that are free to use. 
How? You have to create an account on the developer portal. 
Limitations. Up to 5000 API calls per day. 
Use cases. Tour and attraction services. 
Other suggestions to try?

How to get free travel APIs?

Well I think you should try&nbsp;<a href="https://www.flightapi.io/">FlightAPI</a> Which will provide you with 4 different kind of APIs:1) Flight tracking API which tracks any flight around the world in real-time by providing you the height , coordinates, speed &amp; other essential data in JSON format.2) Flight Price Comparison API , which provides flight fares for any type of journey from multiple vendors &amp; airlines.3) Nearby Airport &amp; Airport Schedule&nbsp; API4) Autocomplete API &amp; IATA code APIAlltogether it's&nbsp; a nice API. Do try it's FREE pack.

Answer for What is the best flight API to integrate?

It depends. There’s no single best flight API. Your choice depends on the specific problem you’re trying to solve (e.g. enable flight and fare search, or track flight status with departure and arrival times, or enable flight booking). Generally, there are two basic options: source data from global distribution systems (or GDSs, the major, worldwide flight aggregators) or directly from airlines. In some cases, you can check APIs by tech providers like FlightStats.
If you need the widest airline coverage and you want to implement flight booking, check GDS APIs by <a href="https://beta.developer.sabre.com/home">Sabre</a>, <a href="https://support.travelport.com/webhelp/uapi/uAPI.htm#Introduction.htm%3FTocPath%3D_____1">Travelport</a>, and <a href="https://developers.amadeus.com/self-service">Amadeus</a>. Each of them covers about 400 active airlines. They search for flights and low fares, and do booking and ticketing. The problem with this approach is that some airlines like Lufthansa set surcharges for booking through GDSs because they want to encourage direct booking or direct cooperation with resellers.
So, the option is to integrate and partner directly with each airline you need. That, however, presents an even larger number of problems as there are only about <a href="https://www.iata.org/whatwedo/airline-distribution/ndc/Pages/ndc-airlines.aspx">40 airlines</a> that have standardized XML-based APIs and each of them is slightly different. So, the engineering effort may be enormous. On the bright side, with direct connections, you get the widest ancillary booking support, seat selection, baggage customization options, etc. The most balanced approach to flight search and booking is to combine GDSs with some direct integrations.
If your goal is general info without booking capabilities, you may not need GDS or direct integration. The first place to go for fresh flight fare data is <a href="https://www.atpco.net/products">ATPCO</a>, the main fare distribution provider. The largest pool for timetables, routes, and connections is provided by <a href="http://www.innovata-llc.com/timetables/">Innovata</a>, a travel tech company. Also check <a href="https://developer.flightstats.com/">FlightStats</a> and <a href="https://www.flightradar24.com/business/data-services">Flightradar24</a> for flight and airport details like delay indexes, arrivals and departures, aircraft equipment, airport FIDS, flight status, etc. 
If you need something simple and don’t want to go through raw airline data, you may contact OTAs or metasearch platforms to integrate their APIs. The key provider here is <a href="https://skyscanner.github.io/slate/?_ga=1.104705984.172843296.1446781555">Skyscanner</a>, but also consider <a href="https://hackathon.expedia.com/docs/public/api/">Expedia</a> or <a href="https://docs.kiwi.com/">Kiwi</a>.
For more details, have a look at our <a href="https://www.altexsoft.com/blog/engineering/travel-and-booking-apis-for-online-travel-and-tourism-service-providers/">travel API's articles</a>.

&nbsp; 
I would recommend to check HitchHiker&rsquo;s Flight API, because it provides access to all major GDS like Amadeus, Travelport and Sabre. Furthermore it offers direct connections to a great number of low-cost and full-service carriers. 
&nbsp; 
Link: <a href="https://www.hitchhiker.net/index.php/our-solutions/#flightapi">https://www.hitchhiker.net/index.php/our-solutions/#flightapi</a> 
&nbsp;&nbsp;

I like using Travelpayouts for API. They provide it for Aviasales and Jetradar. It&rsquo;s a metasearch API so the user searches a bunch of airline offers from your site, but the actual payment is done at the airlines&rsquo; site. Which is a very good thing because I&rsquo;m not be responsible, if there&rsquo;re any problems with the flight. 
The best thing is that it&rsquo;s completely free. The next best thing is that their support team is quick to answer and actually helpful.(Unlike Skyscanner who I&rsquo;ve tried working with.) Also, they work with CPA. If you have quality traffic, than it&rsquo;ll be way more profitable than CPC.

GDS is a worldwide &ldquo;Global Distribution System&rdquo; computerized reservation network used as a single point of access for accommodating airline seats, hotel rooms, rental cars, and other travel related items by travel agents, online reservation sites, and large corporations. 
There are various flight API available in the market like sabre,travelport, Amadeus. it's totally depends upon on your requirment As per my opinon Amadeus GDS is one of the major GDS systems,The Amadeus software GDS integration providers offer you benefits like the control on live inventory, Easy connectivity, Real-time pricing, Automatic content update, Multiple channels for distribution and utilization.

What is the best flight API to integrate?

Thanks a lot for your descriptions. What are the conditions for get access to enterprise API? Where I can find a sample of contract for access to Enterprise API services? 
  
Best regards

Answer for How to integrate the Amadeus API with my travel website? Are there any project examples?

Amadeus has two API packages: Web Services and Travel Innovation Sandbox. The former is created for students or startups, as an exploration stage before the actual production. Amadeus Web Services also has two sets of APIs: Self-Service and Enterprise.
Self-Service is also a testing-only environment, but the production usage promises to be available soon. To try it out, review Amadeus’ <a href="https://developers.amadeus.com/self-service">catalog of REST/JSON APIs</a> and then <a href="https://developers.amadeus.com/create-account">create an account</a> in the Developers portal. In your personal profile, you will automatically get an API key that allows you to start testing APIs right away. 
Enterprise APIs require <a href="https://developers.amadeus.com/contact-us-enterprise">requesting an access</a>. The approval takes longer to receive, but you will get access to the full Amadeus API catalog. You can read about each API in the Enterprise stack <a href="https://developers.amadeus.com/enterprise">here</a>.
As for examples, see <a href="https://aladdintravel.com/">Aladdin Travel</a> – a travel management company that uses Amadeus GDS to organize corporate and student travel. There’s also <a href="https://www.titantravel.co.uk/">Titan Travel</a> that specializes in escorted and solo tours. It switched to Amadeus exclusively after unsuccessfully trying to handle Galileo systems also.

Greetings dear Maryana. 
I filled that form many times! I sent email to comercial@es.amadeus.com also. I called your office in Iran and they didn't know even what is API !! It's very bad. While I filled a request form on Travelport website and they sent Trial Username and Password within 24 hours and we are working on their platform. Can you please introduce a specified person in Amadeus Developer team (in central office, not in Iran) that help us?
Best regards 
Mahdi Nasrabadi

Hi Mahdi, 
 Enterprise APIs are currently in beta and Amadeus doesn't disclose its conditions for granting access to them. So, the only way to know is to contact them directly. We would recommend you to try Self-Service APIs as the program will give you quick access to production and the functionality pool is wide.

Copywriter/Editor

Thank you Maryana. 
Unfortunately Amadeus has a very poor support team! We sent email to request Test access to their email for five times but they didn't answer anyone! What is the correct email of developers support team to we contact them for get test access to enterprise API codes? 
&nbsp; 
Best regards

Hello Archi,
You can describe your problem to our sales people and they will suggest what can be done. Just fill the form or contact them directly here <a href="../../contact-us/">https://www.altexsoft.com/contact-us/</a>.

@Archi 
Enterprise API is massive yes but once you get it going, its requires lots of time in understanding all the parameters/input needed from the SOAP requests to get the desired results. 
If you know what results you want as per your project scope, then you will need to read and understand the technical documentation A to Z.&nbsp; And dont forget, session management is vital before you can get any certification from Amadeus. 
Cheers PC

That's unfortunate, Mahdi. Have you tried phoning one of their physical offices? Find the closest to you here https://corporate.amadeus.com/en/contact-us/all-offices. As we don't know what emails you tried to access, we can recommend trying sending the form from here (just choose your industry) https://amadeus.com/en/contact/contact-sales. Let us know if this helps!

Hi Saikat,
The Self-Service APIs offer 2 different environments: - Test environment: free of charge but limited (limited number of API calls per month and access to a subset of the production data). Good for prototyping and testing. - Production environment: No restriction on the number of API calls and access to production live data without restrictions with a pay-as-you-go business model. &nbsp; Moving from test to production is fully automated on the portal, no need to contact Amadeus for this.
Cheers, Anthony

Developer Relations Manager

Mahdi, I'm afraid we're not related to Amadeus and can't help with customer service questions. This is a forum aimed to help API seekers and developers share their experiences. Nonetheless, we'd like to hear how your interaction with Amadeus continues - this will be very useful for everyone struggling with the same problem.

Can we use amadeus REST API for live application or it is only for demo purpose?

Dear Maryna 
I have signed up for the full Amadeus Enterprise API and to my surprise it is a massive SOAP endpoint system. I was expecting it to be REST/ JSON API's...&nbsp; 
Does anybody specialise or contract to help a company to consume the API.&nbsp; 
The purpose is to cut out months and months of development. 
Regards 
Archi

How to integrate the Amadeus API with my travel website? Are there any project examples?

There are mainly two types of use cases for integrating Booking.com APIs. 
Accommodation booking by travel providers. The model is quite simple. You enroll in the <a href="https://www.booking.com/affiliate-program/v2/index.en-gb.html?aid=357014;label=gog235jc-affiliateprogram-XX-v2-index-unspec-ua-com-L%3Aen-O%3AwindowsS10-B%3Achrome-N%3AXX-S%3Abo-U%3Asal-H%3As;sid=552e1d12760ef058c8be6bdbb7c0a96f">affiliate program</a> and then use the Booking.com API and other affiliate products to either sell rooms from their inventory for a part of a commission or redirect users to Booking.com. The example of the former integration is <a href="https://en.aegeanair.com/">Aegean Air</a>, a Greek airline that allows travelers to <a href="https://hotel.aegeanair.com/?lang=en">book rooms</a> in addition to flights. The latter is <a href="https://www.rome2rio.com/supported">Rome2Rio.com</a>, an itinerary planning and travel search platform. While Aegean uses full Booking.com functionality under its brand, Rome2Rio suggests accommodations, ratings, and pricing with range filters coming from the Booking.com inventory. 
APIs for channel managers. Another major API package is <a href="https://connect.booking.com/">Connectivity</a>. It suggests channel managers and other connectivity providers integrating Booking.com as one of the sales channels. Examples for integration are all the popular accommodation channel managers that you can think of (<a href="https://www.siteminder.com/channel-manager/">SiteMinder</a>, <a href="http://www.dhisco.com/">Dhisco</a>, <a href="https://www.derbysoft.com/">DerbySoft</a>, etc.) Also keep in mind that Booking.com doesn’t allow properties to connect directly. If you’re a hotel owner, you must connect via a channel manager only. You can set your <a href="https://admin.booking.com/?lang=en">property management page</a> on the Booking.com portal and pick your channel manager from there.

Answer for Does anyone know examples of Booking.com API integration?

Does anyone know examples of Booking.com API integration?

Galileo is one of three GDSs along with Apollo and Worldspan that comprise Travelport GDS. Travelport has a pretty straightforward workflow to get started with product.
<ol>
<li>Request trial access to Galileo APIs and <a href="https://developer.travelport.com/app/developer-network/request-formpage">submit a form</a> on Travelport’s website. There, you’ll have to choose your preferred GDS from the three (Galileo in your case). This is free, and you will receive a key to Galileo in a few minutes. Here’s a <a href="https://support.travelport.com/webhelp/uapi/uAPI.htm#Introduction.htm%3FTocPath%3D_____1">link to documentation</a> to help you.</li>
<li>When you’re done with testing, contact an Account Manager from your profile or Travelport itself, and they will supply you with authorization.</li>
<li>After you are authorized, contract finalization and certification will start. This is called the Pre-Production stage. Travelport asks you to complete a <a href="https://support.travelport.com/webhelp/uapi/Content/Resources/Certification/UAPI_TOPS_Questionnaire.docx">Universal API Requirements Questionnaire</a> [.docx] to evaluate your capacity needs. After completion, you should request a sales representative call to review your questionnaire and finalize certification.</li>
<li>When you receive your API certification, you enter the Production system. Make sure your developers and systems comply with <a href="https://support.travelport.com/webhelp/uapi/uAPI.htm#Getting_Started/Before_You_Begin/Requirements_and_Recommendations.htm">Travelport’s requirements</a>. You will receive further instructions from your account manager.</li>
</ol>

Techtalks: Traveltech

Other topics:

What is data profiling in ETL?

Is there any free open source image recognition API?

What is the difference between OLAP database and relational database?