Techtalks: Traveltech

Hi there,
 
That’s actually the question small partners of QPX Express asked themselves in 2018 when the API was ceased. Modeling on Google Flights API, what we seek in substitutes are:
 
1. search for multiple airlines, including low-cost carriers
2. diverse filtering options
3. easy-to-use interface
 
Booking processing isn’t first on our list, as it’s not what a metasearch engine like Google Flights is aimed at. Now, to the candidates.
 
Skyscanner. Another metasearch engine, Skyscanner offers a suite of subscription-free flight search APIs. It pays commissions according to your conversion and traffic quality. The APIs aggregate over 250 airlines and compare them using powerful search algorithms to retrieve the cheapest prices, routes, and dates. This also includes Inspirational search features. Use Flights Browse Prices API for cached content and Flights Live Prices API for real-time queries. Besides flights, Skyscanner also provides APIs to connect car hire and hotel fare data. You can request the API access here. 
 
Travelfusion. Over 150 low-cost carriers are in your pocket if you connect to the Travelfusion Direct Connect XML API. This API also supports fully automated booking processes. So you can either book from your side or redirect to the supplier's website. If you aim at packaged tours, consider Travelfusion Fast API. Prior to using the XML APIs, you’ll have to register and sign the license agreement with set fees.
 
Kiwi.com. The coverage of Kiwi’s API set is about the same size as the Travelfusion’s. It includes both legacy and low-cost carriers. The booking is processed on the OTA’s side. Besides the general flight API capabilities, there’s an API that offers travel tips to customers helping them save time and money. To use the Kiwi API, register for their partner portal Tequila. You’ll get a 3 percent commission on every processed booking.
 
Kayak. If your traffic exceeds 100,000 visitors a month, you’re able to integrate Kayak searches and results into your platform. You can do so by enrolling in their affiliate program. You select the data you need among flights, cars, hotels, trains, packages. 
For more options, check out our article on flight booking API providers.

Thanks Alex Soft team for providing a comprehensive response.

Furthermore, all three Flight APIs you've highlighted appear to hold great potential as alternatives to the Google Flight API for both developers and travel businesses. I recently came across this in-depth article on Google Flight API that not only elucidates the entire journey from the inception to the discontinuation of the Google Flight API but also presents an alternative solution. I believe this alternative could prove highly valuable to businesses seeking reliable flight-related data.