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Turkish Airlines via Booking.com have round trip airfares travelling from Chicago (ORD) to Hanoi Vietnam (HAN) for $ 865, making 1 stop in Istanbul both ways. These are promotional economy fares that include a personal item, a carry-on bag and a free checked bag.

Travel Availability:

Departs ORD: Sept 8, 10-11, 17, 24-25, 29; Oct 1-2, 8-9, 15-16, 23, 27, 30; Nov 6, 13
Returns: Sept 16, 18-19, 23-25, 30; Oct 1-3, 7-10, 14-17, 21-24, 28-29, 31; Nov 4-5, 7, 11-12, 14, 21