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This question already has an answer here:

How does the first stage of the Falcon 9 rocket launch and land at Cape Canaveral, Florida? I was under the impression that its trajectory sends it about 60 miles off the coast. It makes sense to land on a platform at sea. It would have to backtrack a long distance to land near the launch location. Am I missing something or not understanding the SpaceX launch/landing procedure?

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marked as duplicate by Russell Borogove, Jan Doggen, uhoh, Phiteros, SF. Feb 20 '17 at 11:04

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    $\begingroup$ Hi and welcome to the Space stackexchange! Your question's quite sensible, put simply it does indeed cost more propellant to return to launch site rather than down range and so this only works when there is a margin. That all said do please have a nose through the suggested duplicate question and its answers and perhaps some of the related questions listed on the right side here, there is a lot written already. Many of the folks here like people to put a little effort in to make a start on a subject and this is as good a way as any. $\endgroup$ – Puffin Feb 19 '17 at 16:29
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Your understanding is correct. The first stage has to come to a halt, then fly back to the Cape.

This is done for flights where there's enough margin (fuel left over after stage separation) to fly back.

If there's less fuel left, they can land on a barge in the ocean. This takes less fuel than flying back.

SpaceX prefers to land the stage on land (recovery is easier, no ships needed), and on many missions they have enough margin to do that. Basically, they made the rocket larger than it needs to be (if you just look at launching the payload) to accommodate the propellant for landing.

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