u/Capital_Target8633

I need to get to Heathrow terminal 4 from Bristol Bus station, I don't live near temple meads and so train is out of the option for me.

Usually, I get on the national express buses around 6 hours before my flight, since it takes 2 ~ 3 hours to get to Heathrow and I don't want to be late. However, national express is pretty expensive (around 20 pounds for 1 trip, still cheaper than train without railcard), but I'm considering looking at other buses, like Flixbus.

Any opinions on whether I should make the switch to Flixbus instead of NatEx?