AirHint found the following cheapest return flights from Washington (DCA) to Hanoi (HAN) in May 2026 (see full year).

Return flights

05 May - 12 May	Korean Air
11 May - 18 May	Korean Air
11 May - 31 May	Korean Air
12 May - 19 May	Korean Air
12 May - 18 May	Korean Air
11 May - 29 May	Korean Air
12 May - 01 Jun	Korean Air
11 May - 03 Jun	Korean Air
13 May - 20 May	Korean Air
05 May - 22 May	Korean Air
05 May - 19 May	Korean Air
05 May - 23 May	Korean Air
11 May - 05 Jun	Korean Air
12 May - 10 Jun	Korean Air
05 May - 05 Jun	Korean Air
12 May - 13 Jun	Korean Air
12 May - 11 Jun	Korean Air
11 May - 01 Jun	Korean Air
11 May - 09 Jun	Korean Air
12 May - 15 Jun	Korean Air

Also check the deals for one-way flights from Washington to Hanoi in May.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Washington to Hanoi in May from $776

Return flights