Kiwi meets both requirements 1 and 2, allowing searching across broad ranges of dates and airports, including open jaw searches. In my experience it gives a pretty good representation of the cheapest options, especially multiple-ticket options.
For your example, you can do a single search from “Western Europe+Central Europe” to “Eastern Asia+Southeastern Asia” departing in next 30 days returning in 60-90 days. The cheapest results it’s finding at the moment are €353 for Air China round trip from Paris to Taipei (or Hong Kong), followed by €400 for Swiss from Amsterdam to Phuket City. Of course the results change frequently—but I think that’s unavoidably caused by actual changes in the airfares.
If you travel enough to make it worth the price, take a look at the numerous (but expensive) tools at OAG
My copy of Azuon does include Etihad, Cebu, & KLM. They request that we tell them about ones they don’t handle. I am surprised that it does not include Iberia, Czech, & Lufthansa. Oddly, the scroll is broken so I can’t look for Qatar & Turkish.
I would suggest you do the search(es) on Azuon, see which dates/routes have low prices, and use that info to search again on other sites.
UPDATE: Beginning late 2017, Azuon has always said (falsely) there are NO flights between two countries. I think it was Korea and Taiwan, but it may have been one of those and USA. Several different multi-week time periods. Similarly, for several months, Azuon has consistently said that ONLY Southwest flies to/from ANY city in USA on ANY day in those months. I gave up on Azuon and canceled my subscription. Now I use Kiwi to tell me the the best date and airport for a good price, then check the same flight on other sites where it is usually three to five percent cheaper. After finding a good deal, sometimes I ask Flighfox to find me a better one.
Try Adioso. They specialize in broad/vague searches, both by time and destination, and cover many (although not all) low-cost carriers as well.
Don’t expect to find all possible flights with this though: due to the reasons explained in Mark Mayo’s answer, the sheer number of combinations available is so huge (especially with broader searches) that it’s impossible to cover them all.
Basically, no. I know you won’t like the answer, but like many others on this site, I’ve also looked for such a site, and finally someone posted in the [chat] a document about Flight Computational Complexity. Essentially, for just San Fran to Boston on one day there might be 30,000 combinations to search, let alone other dates and so on, and for a long flight where it might take 5-6 airports, there can be 10^15 flight combinations! Multiply by dates, classes, multiple people on the site, and essentially it’s just not possible to do such a complex search, using optimised versions of Dijkstra’s shortest path calculations and others – it’s too much to process.
Google’s possibly our best bet one day, given their processing capabilities – they’ve bought ITA Software, and Google Flights is getting good. However, not yet. For now you have to do what all the ‘experts’ do – use the tools you know work ‘well enough’ for various areas – skyscanner for Europe/Cuba, kayak for others, matrix.itasoftware for clever paths or advanced routing codes, and so on :/
Credit:stackoverflow.com‘
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