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I was browsing flight price at Singapore Airlines website, and a one-way flight from SIN to SFO cost this much:

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That's quite expensive. I tried browsing around and found that a return flight from SFO to SIN and back to SFO cost much cheaper:

enter image description here

It's really weird because the second ticket includes the exact same flight that cost 1900+, but it's almost half the price. The reason for this counter-intuitive situation is explained in the answers this question One-way versus return airfare tickets

If I am located in Singapore and my intention is to fly one-way to SFO, is it safe to book the flight in the second picture and only board SFO-SIN leg? Will they deny me because I miss the SIN-SFO flight?

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marked as duplicate by Mark Mayo, Marcel C., Ankur Banerjee Jul 14 '13 at 14:29

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.

Hello guys who voted duplicate, Thanks for pointing out to the other question. Can I refocus the question on whether it is okay to board only the second flight, will it be reopened? – Saif60 Jul 14 '13 at 14:58
The second part of your question has been previously covered in Do you have to take the second leg of a flight? – Ankur Banerjee Jul 14 '13 at 15:02
@AnkurBanerjee it's not the same. That question was about taking only the first leg in a multi-leg one-way ticket. This one is about taking only the second leg of a direct return ticket. – Saif60 Jul 14 '13 at 15:47
Essentially the answer's the same. :) See this other question: Is it fair to buy a return ticket I know I will never use just because it's cheaper? – Ankur Banerjee Jul 15 '13 at 5:05
You're comparing SGD to USD... the first flight is still more expensive (USD$1530), but not by nearly as much as you imply--at least by today's exchange rate. – Flimzy Jan 20 '15 at 6:13

First off, no it is not safe to discard the first leg. If you buy a return (or any multi leg) ticket, missing the first flight on it (or any interim flights if there are more than one) will void the remaining flight(s) on the ticket.

As for why the one-way ticket is more expensive, that has already been answered in detail here: One-way versus return airfare tickets

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