Originally Posted by
ofto
If you're taking the train it makes a bit more sense to get off at the first stop in Budapest-Kelenföld, though its not as nice as Keleti station, you get in 15 minutes earlier. The cab (30 min) or public transportation (60 min) will cost the same and be just as fast. Public transporation: 49 Tram to M2 Metro to 200E bus,
http://goo.gl/maps/9W4Nl.
Personally, I wouldn't get off at Kelenföld. It's out in the Styx, it's a generally unpleasant place, and it can be difficult to get a taxi from there. You can call and wait, but it might take longer, and City Taxi's airport transfer price, for example, is HUF 1,000 more expensive from there.
On public transport, it's also more expensive - you'd be using tram/metro/bus, which requires either three single tickets or a transfer ticket and a single ticket. From Keleti, metro/metro/bus only requires one transfer ticket (you don't need to validate the ticket for the metro/metro transfer).