AirHint found the following cheapest return flights from Chicago (ORD) to Seoul (ICN) in May 2026 (see full year).

Return flights

20 May - 31 May	Frontier Airlines
20 May - 01 Jun	WestJet
06 May - 25 May	Alaska Airlines
18 May - 27 May	Frontier Airlines
19 May - 26 May	WestJet
09 May - 24 May	Frontier Airlines
06 May - 13 May	Turkish Airlines
20 May - 10 Jun	WestJet
15 May - 23 May	WestJet
29 May - 09 Jun	WestJet
18 May - 10 Jun	Frontier Airlines
14 May - 07 Jun	WestJet
18 May - 26 May	Spirit Airlines
29 May - 07 Jun	WestJet
26 May - 26 Jun	WestJet
13 May - 19 May	EVA Air
25 May - 30 May	Alaska Airlines
18 May - 18 Jun	Air Canada
18 May - 18 Jun	Delta	direct
26 May - 26 Jun	Korean Air	direct

Also check the deals for one-way flights from Chicago to Seoul 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 Chicago to Seoul in May from 799€

Return flights