In terms of precipitation, rainfall in Ulsan ranges from 1.2 - 10.2 inches per month. July is typically the wettest month, when rainfall can reach 10.2 in. January is typically the driest time to visit Ulsan when rainfall is around 1.2 in.

If weather is an important factor for your trip to Ulsan, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

What is the cheapest day to fly round-trip from San Francisco to Ulsan?

Flights from San Francisco to Ulsan are found to be more expensive on Wednesday. This shouldn't discourage you from searching as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Ulsan.

What is the cheapest month to fly from San Francisco to Ulsan?

March is one of the best times of the year to fly to Ulsan from San Francisco. Prices for March average $1,191 per person but you can even find prices for as low as $931. The most expensive prices can be found in the month of December. Opting for a March flight can save you 52% on your journey compared to booking in December

Can I find deals for flights from San Francisco to Ulsan that include hotel bookings?

Yes. In addition to deals on San Francisco to Ulsan flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from San Francisco to Ulsan?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Francisco to Ulsan.

Can I find deals for business class flights from San Francisco to Ulsan?

Yes. Cheapflights offers flight deals from San Francisco to Ulsan by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$1,426+ Flights from San Francisco to Ulsan

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Cheap flight deals from San Francisco to Ulsan

Round-trip from	$1,426 (Korean Air)
Popular in	December
Cheapest in	March
Average price	$1,521

From San Francisco to Ulsan

Search Deals

Highest demand for flights based on searches. 14% potential increase in price ($195 potential increase over avg. RT price).

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Cheapest flight prices on average. 4% potential price decrease ($57 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in July 2025

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Find flight deals from San Francisco to Ulsan

Cheapest flights from San Francisco to Ulsan
Explore the most affordable flight options available from San Francisco to Ulsan. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 30, 2025.

Tue 8/51:10 pmSFO - USN

1 stop27h 10mKorean Air

Sat 8/169:00 amUSN - SFO

1 stop18h 00mKorean Air

Deal found 7/30

$1,426

Best flights from San Francisco to Ulsan
Discover carefully curated flight deals from San Francisco to Ulsan that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 30, 2025.

Tue 8/51:10 pmSFO - USN

1 stop27h 10mKorean Air

Sat 8/169:00 amUSN - SFO

1 stop18h 00mKorean Air

Deal found 7/30

$1,426

Last-minute flights from San Francisco to Ulsan
Discover last-minute flight deals from San Francisco to Ulsan. Data last updated July 30, 2025 and is based on user searches.

Tue 8/51:10 pmSFO - USN

1 stop27h 10mKorean Air

Sat 8/169:00 amUSN - SFO

1 stop18h 00mKorean Air

Deal found 7/30

$1,426

Fly from

Fly to

Route

Depart

Return

Price

San FranciscoUlsan

SFO - USN

SFOUSN

San Francisco

Tue 8/5

1:10 pm-8:20 am

1 stop27h 10m

Ulsan

Sat 8/16

9:00 am-11:00 am

1 stop18h 00m

$1,426

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

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?

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?

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.

Reviews of airlines servicing Ulsan

Peruse reviews from past customers who have flown with Korean Air from San Francisco to Ulsan to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Korean Air

8.4

Very good

1,121 reviews

Reviews

1 / 20

10.0

Excellent

Chris,Mar 2025

SEA - ICN

Was told the flight was overbooked so they selected only a few people to weight their bags and we were forced to check our luggage. We Once we got seated on the flight there were many seats vacant and our overhead bin was completely open. Both our luggage and our carryon were small. We had booked our tickets months in advance and we watched people carry two small suitcases on without one word to them. Am I upset?? Yes it was disappointing.

Korean Air

8.4

Very good

1,121 reviews

Korean Air

8.4

Very good

1,121 reviews

Reviews

1 / 20

10.0

Excellent

Chris,Mar 2025

SEA - ICN

Related info for your journey

Can I find deals for flights from San Francisco to Ulsan that include hotel bookings?
Yes. In addition to deals on San Francisco to Ulsan flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from San Francisco to Ulsan?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Francisco to Ulsan.
Can I find deals for business class flights from San Francisco to Ulsan?
Yes. Cheapflights offers flight deals from San Francisco to Ulsan by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

Browse thousands of different options on Cheapflights for your next trip

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$1,426+ Cheap flights from San Francisco (SFO) to Ulsan (USN)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/5. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from San Francisco to Ulsan with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from San Francisco to Ulsan

Round-trip from

Popular in

Cheapest in

Average price

Find flight deals from San Francisco to Ulsan

Cheapest flights from San Francisco to UlsanExplore the most affordable flight options available from San Francisco to Ulsan. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 30, 2025.

Explore the most affordable flight options available from San Francisco to Ulsan. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 30, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from San Francisco to Ulsan that are best for you.

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.

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 July 30, 2025.

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.

Reviews of airlines servicing Ulsan

Get insights into the airlines that provide service to Ulsan. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ulsan. Reviews last updated July 30, 2025.

Peruse reviews from past customers who have flown with Korean Air from San Francisco to Ulsan to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from San Francisco to Ulsan. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

Can I find deals for flights from San Francisco to Ulsan that include hotel bookings?

How can I find direct flights from San Francisco to Ulsan?

Can I find deals for business class flights from San Francisco to Ulsan?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for San Francisco to Ulsan

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Cheapest flights from San Francisco to Ulsan
Explore the most affordable flight options available from San Francisco to Ulsan. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 30, 2025.