One formula for calculating the air speed velocity of birds is here: http://style.org/unladenswallow (which estimates that the airspeed velocity of an unladen European Swallow is 10 meters per second).
Note that sparrows are different from swallows and, according to WikiAnswers, swallows are on average 20 g heavier then sparrows (weight varies depending on species). Also according to WikiAnswers (http://wiki.answers.com/Q/How_fast_can_a_sparrow_fly), a sparrow can fly between 16 and 19 MPH (25-30 Km/h). So swallows generally are faster than sparrows.
Note that sparrows are different from swallows and, according to WikiAnswers, swallows are on average 20 g heavier then sparrows (weight varies depending on species). Also according to WikiAnswers (http://wiki.answers.com/Q/How_fast_can_a_sparrow_fly), a sparrow can fly between 16 and 19 MPH (25-30 Km/h). So swallows generally are faster than sparrows.
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