As carbon emissions increase, coastal waters are experiencing climate change impacts including ocean warming (OW) and decreases in pH via ocean acidification (OA). Supporting a multi-million fishery in the western Atlantic, the Atlantic surfclam, Spisula solidissima solidissima has demonstrated sensitivities to climate change phenomena; however, potential synergistic effects and behavioral responses relevant to larval transport have yet to be investigated. Specifically, if climate change induces larval behavioral changes, the time and space in the water column that larvae occupy will change, which may affect dispersal patterns. This study used laboratory experiments to measure surfclam larval mortality, growth, swimming behavior and pelagic larval duration (PLD) (i.e. time to settlement) in response to projected OW and OA scenarios using a experimental design that assessed both main and interactive effects. While mortality did not differ between treatments, growth increased under OW and was reduced under OA. While the percent of swimming larvae did not differ between treatments, OW yielded lower swimming speeds. Furthermore, OW but not OA reduced PLD. These results suggest that while projected climate change scenarios may not increase larval mortality, development and behavior relevant to transport may be altered, thereby affecting dispersal patterns and settlement success. Specifically, larvae with a shorter PLD and that swim slower and therefore spend less time in the surface mixed layer may experience reduced dispersal distances. Scaling up these behavioral changes to larval transport patterns may provide insight regarding projected spatial changes in settlement success and recruitment.