AirHint found the following cheapest return flights from Washington (IAD) to Cancun (CUN) in May 2026 (see full year).
Return flights
| 18 May - 23 May | United | direct | |
| 01 May - 04 May | United | ||
| 14 May - 17 May | Avianca | ||
| 22 May - 25 May | United | direct |
Also check the deals for one-way flights from Washington to Cancun in May.
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