United has round-trip flights from Houston (IAH) to Singapore (SIN) for $665-$680 with a connection. Flights February to May. No Weekends. Departures on Monday, Tuesday, Wednesday, and Thursday. Extended Weekends available.
Like most United/ANA flights to Asia, this fare allows a stopover in Tokyo for about $120 more. This is useful if you want to spend time in both countries.
You can also save an additional 16% off your Hotel or up to $150 for Flight+Hotel packages on CheapTickets by using the “WANDERLUST” or “ADVENTURE150” coupon codes at checkout (before finalizing your booking).
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Click for more details and booking links Cheap Flights: Houston to Singapore $665-$680 r/t – United