:This passage is related only by Mark. Compare [http://biblehub.com/mark/7-31.htm parallel versions of Mark 7:31.]
:The names of Σιδῶνος ''or'' Σιδονία "Sidon" and Τύρου "Tyre" always designate the cities themselves; they are never used as the name of their general geographical region (see [http://biblehub.com/commentaries/mark/7-31.htm commentaries on Mark 7:31]). The King James Bible uses them as the name of the whole region, "departing from the coasts of Tyre and Sidon". Others read "the district of Tyre and Sidon" (Matthew 15:21), "the region of Tyre and Sidon" (Mark 7:24). Compare the [https://biblehub.com/interlinear/mark/7-31.htm interlinear text of Mark 7:31] where the region of Tyre is separate from Sidon. Sidon is about 20 miles north of Tyre.
:In [https://www.biblegateway.com/passage/?search=Matthew+11%3A21-22&version=RSVCE Matthew 11:21-22] and [https://www.biblegateway.com/passage/?search=Luke+10%3A13-14&version=RSVCE Luke 10:13-14] Jesus bears witness that he did not do mighty works in Tyre and Sidon (compare Matthew 10:5 and Luke 9:52-53). There is no indication in the Gospel telling why Jesus turned from the region of Tyre first in a northern direction, and went through Sidon, and then returned south to the east side of the lake, so that from Sidon he arrived at the Sea of Galilee on the farther side of Jordan, and journeyed through the midst of the regions belonging to Decapolis. Why Jesus went from Tyre through Sidon to the Sea of Galilee is no mystery. There was a well-travelled trade road between Tyre and Sidon, and another well-travelled trade road from Sidon through the mountains and south to the Sea of Galilee, so that by the ordinary course of using these established trade route "highways" in that part of the country Jesus would have simply passed from Tyre through Sidon on his way back to the Sea of Galilee. This whole distance travelled from Tyre to Sidon and south to the Sea of Galilee across the Jordan River through Decapolis, and then on to the mountain south of the Sea of Galilee where he fed the multitude (Mark 8:1-10) was a journey of more than 80 miles on foot.