This paper offers elaborate analyses regarding the effects of social-as well as institutional trust as parts of social capital on subjective well-being (SWB) by using data from the European Social Survey, including 36 countries and eight time-points between 2002 and 2016. We analyze (1) The development of trust and SWB on the aggregate level; (2) The effect of trust on SWB on the individual cross-sectional level; and (3) The longitudinal and crosssectional effect of trust on SWB on the aggregate level while considering control variables based on previous research. We observe a weak positive trend regarding social trust as well as SWB over time, but no significant change in institutional trust. However, trends are far from homogeneous across countries. In accordance to previous studies, we find a positive effect of social trust on SWB. This effect holds on the individual cross-sectional level for every participating country, but also on the longitudinal level. In view of institutional trust, we see a positive effect on SWB on the individual and aggregate cross-sectional level, but not over time. Thus, this study particularly sheds new light on this relation, indicating that it´s cross-sectional relation is due to confounding variables. Moreover, we observe no relation between economic growth and SWB after controlling for unemployment, but a positive effect of decreasing unemployment and inflation on SWB. Our data suggests that establishing an environment with high social trust across Europe would be rewarded with a happy society.