The Abra app supports loading money with credit cards and then converting to crypto, as of March this year: https://www.abra.com/blog/20-new-cryptocurrencies/

The Revolut app also supports the same, but in more countries and with more different types of credit cards accepted: https://www.revolut.com/au/cryptocurrency

As @OmegaStarScream mentioned, Virwox.com has very high fees. Though they do allow some interesting conversions such as Paypal -> BTC if you're willing to accept the high overheads. Virwox is pretty much instant, as are both of the apps mentioned above.

CEX.IO requires a bit more setup and I've found their KYC to be incredibly slow. Coinmama is more light weight, but has a speedier KYC in my experience.