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Sanibel Island is approximately 23 miles southwest of downtown Fort Myers, and Captiva lies north of 12-mile-long Sanibel. If you're flying into Southwest Florida International Airport, an on-demand taxi for up to three passengers to Sanibel or Captiva costs about $60–$68; additional passengers are charged $10 each. Sanibel Island is accessible from the mainland via the Sanibel Causeway (toll $6 round-trip). Captiva Island lies across a small pass from Sanibel's north end, accessible by bridge.