AirHint found the following cheapest return flights from Seattle (SEA) to Cancun (CUN) in May 2026 (see full year).

Return flights

01 May - 09 May	Volaris
14 May - 24 May	Volaris
26 May - 02 Jun	jetBlue
29 May - 03 Jun	Volaris
15 May - 24 May	Volaris
27 May - 01 Jun	Volaris
22 May - 25 May	Volaris
27 May - 01 Jun	Aeromexico	direct
29 May - 03 Jun	Aeromexico	direct
01 May - 09 May	Aeromexico	direct
26 May - 02 Jun	Aeromexico	direct
16 May - 24 May	Delta	direct
14 May - 24 May	Aeromexico	direct

Also check the deals for one-way flights from Seattle to Cancun 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 Seattle to Cancun in May from $397

Return flights