$3,027+ Cheap flights from San Francisco (SFO) 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 10/20. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — USN
Oct 15 — Oct 221
1 adult, Economy
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One-way flights from San Francisco to UlsanSearch for one-way flight options from San Francisco to Ulsan. Find affordable one-way fares based on user searches. Data last updated September 15, 2025.
Search for one-way flight options from San Francisco to Ulsan. Find affordable one-way fares based on user searches. Data last updated September 15, 2025.
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/2011:55 pmSFO - USN
3 stops44h 10mMultiple Airlines
Deal found 9/13![Multiple Airlines logo]()
$3,027
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2111:55 pmSFO - USN
3 stops44h 10mMultiple Airlines
Deal found 9/13![Multiple Airlines logo]()
$3,141
This Korean Air deal was found by Cheapflights users on 9/13. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/203:30 pmSFO - USN
2 stops48h 50mKorean Air
Deal found 9/13![Korean Air logo]()
$3,450
This Korean Air deal was found by Cheapflights users on 9/13. 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 Korean Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/216:59 pmSFO - USN
2 stops32h 36mKorean Air
Deal found 9/13![Korean Air logo]()
$4,325
Cheapflights Fare Finder
Customize your flight search to find flights from San Francisco to Ulsan that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 15, 2025.
Use the filters below to find and compare flights from San Francisco to Ulsan that are best for you.
Fly from
San Francisco
Fly to
Ulsan
Route
Depart
Return
Price
San FranciscoUlsan
SFO - USN
SFOUSN
San Francisco
Mon 10/20
11:55 pm-12:05 pm
3 stops44h 10m
$3,027
San FranciscoUlsan
SFO - USN
SFOUSN
San Francisco
Tue 10/21
11:55 pm-12:05 pm
3 stops44h 10m
$3,141
San FranciscoUlsan
SFO - USN
SFOUSN
San Francisco
Mon 10/20
3:30 pm-8:20 am
2 stops48h 50m
$3,450
San FranciscoUlsan
SFO - USN
SFOUSN
San Francisco
Tue 10/21
6:59 pm-7:35 pm
2 stops32h 36m
$4,325
Best time to book a flight from San Francisco to Ulsan
Have a flexible travel schedule? Discover the best time to fly to Ulsan from San Francisco with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from San Francisco to Ulsan
What is the cheapest time of day to fly from SFO to USN?
Find hourly flight availability from San Francisco 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 September 15, 2025.
One of the essential ways to save on airfare from San Francisco to Ulsan is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 62% on airfare.
What is the cheapest day to fly from San Francisco to Ulsan?
Use this chart to determine the cheapest time to fly round-trip from San Francisco to Ulsan. Price data was last updated on March 30, 2025.
Travelers seeking maximum savings on their San Francisco to Ulsan flight should consider departing on Monday at noon when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.