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Singapore Airlines via DealBase offers select round-trip flights to Asia and Europe, with prices starting from $612.07. That's the best price we could find for select routes by at least $31. Book this travel deal by September 30 for travel through November 30. Buy Now Tips On the DealBase landing page, click on "Singapore Airlines" in the top line to see this sale. We found this price on flights departing on November 12 from Seattle, WA (SEA) to Manila, Philippines (MNL), with return on November 20. All prices, dates, and booking details were valid at the time of publication.