$940+ Cheap flights from California to Ulsan (USN)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/28. Fares are subject to change and may not be available on all flights or dates of travel.
Find cheap flights from California to Ulsan with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from California to Ulsan
Keep the following information in mind while searching for California to Ulsan flight deals. Data was last updated October 30, 2025.
Round-trip from | $3,136 (Mytrip) |
|---|---|
One-way from | $940 (Korean Air) |
Find flight deals from California to Ulsan
Best flights from California to UlsanDiscover carefully curated flight deals from California to Ulsan that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 30, 2025.
Discover carefully curated flight deals from California to Ulsan that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 30, 2025.
This Mytrip deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Cheapflights Fare Finder
Use the filters below to find and compare flights from California to Ulsan that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
San FranciscoUlsan
SFO - USN
SFOUSN
San Francisco
Thu 3/26
12:10 am-4:55 pm
2 stops24h 45m
Ulsan
Sat 4/11
9:00 am-4:35 pm
2 stops23h 35m
San FranciscoUlsan
SFO - USN
SFOUSN
San Francisco
Wed 1/28
11:40 am-8:50 am
1 stop28h 10m
San FranciscoUlsan
SFO - USN
SFOUSN
San Francisco
Thu 1/22
11:40 am-8:50 am
1 stop28h 10m
San FranciscoUlsan
SFO - USN
SFOUSN
San Francisco
Mon 1/26
1:35 pm-7:40 pm
2 stops37h 05m
San FranciscoUlsan
SFO - USN
SFOUSN
San Francisco
Sun 1/25
4:02 pm-8:50 am
2 stops47h 48m
San FranciscoUlsan
SFO - USN
SFOUSN
San Francisco
Fri 1/23
11:40 am-8:50 am
1 stop28h 10m
San FranciscoUlsan
SFO - USN
SFOUSN
San Francisco
Sat 1/24
11:40 am-8:50 am
1 stop28h 10m
Best time to book a flight from California to Ulsan
Have a flexible travel schedule? Discover the best time to fly to Ulsan from California with our price prediction graph.
Cheapflights Insights
Everything you need to know about your flight from California to Ulsan
What is the cheapest month to book a flight from California to Ulsan?
Currently, February is the cheapest month in which you can book a flight from California to Ulsan (average of $574). Flying from California to Ulsan in December is currently the most expensive (average of $1,193). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from CA to USN?
Find hourly flight availability from California to Ulsan. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 30, 2025.
Unlike in the evening, when flights are generally more expensive, you can save up to 30% on flights from California to Ulsan by exploring options for tickets in the afternoon.
What is the cheapest day to fly from California to Ulsan?
Use this chart to determine the cheapest time to fly round-trip from California to Ulsan. Price data was last updated on March 30, 2025.
Travelers seeking maximum savings on their California to Ulsan flight should consider departing on Monday mornings when fares are most often at their lowest. Thursday evenings flights should be avoided if possible as fares are typically the most expensive at this time.