People have always "traveled" to get abortions. But, as the AMA discovered a hundred years ago, many "respectable" physicians performed abortions for their best patients, so very often they had to go no further than their family doctor's office. However it remained a dangerous procedure until the invention of penicillin in the 1940s. Antibiotics did not become readily available to the public until after WWII.
That's true. That's why, while we can't get statistics for abortion during the time it was illegal, you can draw some inference from old records, when "sepsis" was just listed as cause of death for women of childbearing age.