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Ontario to Seoul ONT → ICN

Ontario International Airport (ONT) → Incheon International Airport (ICN)

The cheapest return found recently is $1,134 with China Airlines, 29 Nov – 10 Dec, found yesterday.

Return

The cheapest return fare on each of 13 departure dates is usually $1,203 to $1,433.

Cheapest return found recently

$1,134

29 Nov – 10 Dec · China Airlines

Ontario International Airport (ONT) → Incheon International Airport (ICN)

Leaves 10:50 p.m. · Return leaves 1:10 p.m. · 42 h 20 min of travel, both ways together

out 1 stop, back 1 stop

found yesterday

See prices for these datesCheck today's price

Cheapest nonstop return

None seen yet.

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Found recently, and the cheapest we hold

Cheapest found recently $1,134 29 Nov – 10 Decfound yesterdaySee prices for these dates

Cheapest we hold, of any age $1,069 10 Nov – 3 Decfound 4 days agoSee prices for these dates

What have prices looked like?

Over 25 days, 24 Sept to 18 Oct, the cheapest return we saw each day was $1,017 to $1,243.

$1,134, the cheapest return found recently, sits here in that range of $1,017 to $1,243.

25 days is a short history, so treat this range as an early guide.

Those were the prices on those days, not today's.

Is this a good return price?

Compared with the cheapest return fare on each of 13 departure dates from 21 Oct to 10 Aug 2027, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.

Could nearby dates be cheaper?

We hold no other 11-night return fares leaving within 3 days of 29 Nov to compare.

Every date we hold

14 fares on 13 departure dates

21 Oct – 22 Oct: $1,433, found 6 days ago10 Nov – 3 Dec: $1,069, found 4 days ago14 Nov – 20 Nov: $1,204, found 4 days ago20 Nov – 1 Dec: $1,529, found yesterday22 Nov – 3 Dec: $1,144, found yesterday29 Nov – 10 Dec: $1,134, found yesterday6 Dec – 17 Dec: $1,391, found yesterday7 Dec – 12 Dec: $1,383, found 4 days ago12 Dec – 10 Jan 2027: $1,821, found today25 Dec – 31 Dec: $1,714, found 4 days ago28 Dec – 11 Jan 2027: $1,393, found today8 Apr 2027 – 15 Apr 2027: $1,205, found 5 days ago10 Aug 2027 – 20 Aug 2027: $1,203, found 4 days agoOctNovDecAprAug
See the chart as a table
The cheapest price seen for each departure date — per traveler in Economy.
DatesFromAirlineAirportsStopsFound
21 Oct – 22 Oct$1,433United AirlinesOntario International Airport (ONT) → Incheon International Airport (ICN)out 1 stop, back nonstopfound 6 days agoSee prices for these dates
10 Nov – 3 Dec$1,069Korean AirOntario International Airport (ONT) → Incheon International Airport (ICN)out 1 stop, back nonstopfound 4 days agoSee prices for these dates
14 Nov – 20 Nov$1,204Alaska AirlinesOntario International Airport (ONT) → Incheon International Airport (ICN)out 1 stop, back 1 stopfound 4 days agoSee prices for these dates
20 Nov – 1 Dec$1,529Korean AirOntario International Airport (ONT) → Incheon International Airport (ICN)out 1 stop, back nonstopfound yesterdaySee prices for these dates
22 Nov – 3 Dec$1,144Alaska AirlinesOntario International Airport (ONT) → Incheon International Airport (ICN)out 1 stop, back 2 stopsfound yesterdaySee prices for these dates
29 Nov – 10 Dec$1,134China AirlinesOntario International Airport (ONT) → Incheon International Airport (ICN)out 1 stop, back 1 stopfound yesterdaySee prices for these dates
6 Dec – 17 Dec$1,391American AirlinesOntario International Airport (ONT) → Incheon International Airport (ICN)out 1 stop, back 1 stopfound yesterdaySee prices for these dates
7 Dec – 12 Dec$1,383United AirlinesOntario International Airport (ONT) → Incheon International Airport (ICN)out 1 stop, back 1 stopfound 4 days agoSee prices for these dates
12 Dec – 10 Jan 2027$1,821China AirlinesOntario International Airport (ONT) → Incheon International Airport (ICN)out 1 stop, back 1 stopfound todaySee prices for these dates
25 Dec – 31 Dec$1,714Korean AirOntario International Airport (ONT) → Incheon International Airport (ICN)out 1 stop, back nonstopfound 4 days agoSee prices for these dates
28 Dec – 11 Jan 2027$1,393Korean AirOntario International Airport (ONT) → Incheon International Airport (ICN)out 1 stop, back nonstopfound todaySee prices for these dates
8 Apr 2027 – 15 Apr 2027$1,205China AirlinesOntario International Airport (ONT) → Incheon International Airport (ICN)out 1 stop, back 1 stopfound 5 days agoSee prices for these dates
10 Aug 2027 – 20 Aug 2027$1,203China AirlinesOntario International Airport (ONT) → Incheon International Airport (ICN)out 1 stop, back 1 stopfound 4 days agoSee prices for these dates

Which month looks cheapest?

November 2026 is the cheapest month — from $1,069.

October 2026From $1,4331 departure date21 Oct – 22 Oct · found 6 days agoSee prices for these dates
November 2026From $1,069Cheapest seen5 departure dates10 Nov – 3 Dec · found 4 days agoSee prices for these dates
December 2026From $1,3835 departure dates7 Dec – 12 Dec · found 4 days agoSee prices for these dates
April 2027From $1,2051 departure date8 Apr 2027 – 15 Apr 2027 · found 5 days agoSee prices for these dates
August 2027From $1,2031 departure date10 Aug 2027 – 20 Aug 2027 · found 4 days agoSee prices for these dates

Airlines on the cheapest dates: Korean Air, China Airlines, United Airlines, Alaska Airlines, American Airlines.

Premium cabin fares from Ontario to Seoul

We hold no premium economy, business or first-class fares for this route: we collect them for the busiest routes, and this one is not among them yet.

Today's prices for 29 Nov – 10 Dec in another cabin: Premium economy · Business · First

How far ahead were prices cheapest for Ontario to Seoul?

Return

The cheapest fares were 7 to 13 days before departure.

From the cheapest return each day between 24 Sept and 18 Oct (25 days), grouped by how many days ahead the flight left; one adult in economy.

Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.

Prices reflect recent searches — current fares may differ.

See these ranges as a table
Typical price in each booking range — round trip, per traveler in Economy.
Booked ahead byTypical fareCheapest dayAbove the cheapestDays of prices
7–13 days$1,065$1,065Cheapest seen11
14–29 days$1,069$1,058+0%20
30–59 days$1,118$1,017+5%17
60–89 days$1,557$1,269+46%23
90–179 days$1,205$1,051+13%18
180+ days$1,098$1,047+3%21

Could a nearby airport be cheaper?

A different airport at either end can change the fare — sometimes a lot.

Return

Los Angeles → Seoul

56 km from Ontario

$688

$446 less than flying from Ontario

29 Nov – 10 Dec · LAX → ICN · out 1 stop, back 1 stop

found yesterday

See this route

Long Beach → Seoul

60 km from Ontario

$1,243

$109 more than flying from Ontario

22 Nov – 3 Dec · LGB → ICN · out 1 stop, back 1 stop

found yesterday

See this route

Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.

One-way

Long Beach → Seoul

60 km from Ontario

$783

27 Dec · LGB → ICN · 2 stops

found 4 days ago

See this route

Cheapest recent price on each route — one way, per traveler in Economy. Distances are in a straight line.

Live price for these dates

The cheapest return found recently is for 29 Nov – 10 Dec. A live search on this page shows what those dates cost now, for one adult in economy.

Prices are what travelers' searches on Aviasales found in the last 7 days, in US dollars: the price the seller showed on Aviasales; bags may cost extra. Fares change, so check today's price before you book. How our prices work