Cheap Flights to Washington County from ₩134,800

View ₩134,800 flight on Tue, May 12, 2026Opens in a new window

Popular airlines to Washington County

  • American Airlines

  • Delta

  • United

  • Southwest Airlines

  • Frontier Airlines

  • Alaska Airlines

  • Air Canada

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How much is the cheapest flight to Washington County?

Prices were available within the past 7 days and start at ₩134,800 for one-way flights and ₩277,400 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Thu, Jun 4 - Wed, Jun 10
SEA
Seattle
STL
St. Louis
₩277,400 Roundtrip, found 20 hours ago
₩277,400
Roundtrip
found 20 hours ago
Select Delta flight, departing Thu, Jun 4 from Seattle to St. Louis, returning Wed, Jun 10, priced at ₩277,400 found 20 hours ago
United
Thu, Jun 4 - Wed, Jun 10
SEA
Seattle
STL
St. Louis
₩485,500 Roundtrip, found 20 hours ago
₩485,500
Roundtrip
found 20 hours ago
Select United flight, departing Thu, Jun 4 from Seattle to St. Louis, returning Wed, Jun 10, priced at ₩485,500 found 20 hours ago
Delta
Fri, May 8 - Tue, May 12
ATL
Atlanta
STL
St. Louis
₩579,000 Roundtrip, found 5 days ago
₩579,000
Roundtrip
found 5 days ago
Select Delta flight, departing Fri, May 8 from Atlanta to St. Louis, returning Tue, May 12, priced at ₩579,000 found 5 days ago
American Airlines
Thu, Jun 4 - Wed, Jun 10
SEA
Seattle
STL
St. Louis
₩689,500 Roundtrip, found 20 hours ago
₩689,500
Roundtrip
found 20 hours ago
Select American Airlines flight, departing Thu, Jun 4 from Seattle to St. Louis, returning Wed, Jun 10, priced at ₩689,500 found 20 hours ago
Delta
Sat, Jun 27 - Sun, Jul 5
LHR
London
STL
St. Louis
₩1,699,000 Roundtrip, found 12 hours ago
₩1,699,000
Roundtrip
found 12 hours ago
Select Delta flight, departing Sat, Jun 27 from London to St. Louis, returning Sun, Jul 5, priced at ₩1,699,000 found 12 hours ago
KLM
Sat, Jun 27 - Sun, Jul 5
LHR
London
STL
St. Louis
₩1,783,000 Roundtrip, found 12 hours ago
₩1,783,000
Roundtrip
found 12 hours ago
Select KLM flight, departing Sat, Jun 27 from London to St. Louis, returning Sun, Jul 5, priced at ₩1,783,000 found 12 hours ago
Delta
Thu, Nov 12 - Thu, Jan 14
ICN
Seoul
STL
St. Louis
₩1,870,000 Roundtrip, found 2 days ago
₩1,870,000
Roundtrip
found 2 days ago
Select Delta flight, departing Thu, Nov 12 from Seoul to St. Louis, returning Thu, Jan 14, priced at ₩1,870,000 found 2 days ago
Air Canada
Thu, Nov 12 - Thu, Jan 14
ICN
Seoul
STL
St. Louis
₩1,963,300 Roundtrip, found 2 days ago
₩1,963,300
Roundtrip
found 2 days ago
Select Air Canada flight, departing Thu, Nov 12 from Seoul to St. Louis, returning Thu, Jan 14, priced at ₩1,963,300 found 2 days ago
Korean Air
Thu, Nov 12 - Thu, Jan 14
ICN
Seoul
STL
St. Louis
₩1,970,000 Roundtrip, found 2 days ago
₩1,970,000
Roundtrip
found 2 days ago
Select Korean Air flight, departing Thu, Nov 12 from Seoul to St. Louis, returning Thu, Jan 14, priced at ₩1,970,000 found 2 days ago
Qatar Airways
Wed, Jul 22 - Mon, Aug 17
ICN
Seoul
STL
St. Louis
₩2,083,200 Roundtrip, found 4 days ago
₩2,083,200
Roundtrip
found 4 days ago
Select Qatar Airways flight, departing Wed, Jul 22 from Seoul to St. Louis, returning Mon, Aug 17, priced at ₩2,083,200 found 4 days ago

Trending flights to Washington County

These prices were available within the past 7 days. Prices quoted are per person, round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Thu, Nov 12 - Thu, Jan 14
ICN
Seoul
STL
St. Louis
₩1,870,000 Roundtrip, found 2 days ago
₩1,870,000
Roundtrip
found 2 days ago
Select Delta flight, departing Thu, Nov 12 from Seoul to St. Louis, returning Thu, Jan 14, priced at ₩1,870,000 found 2 days ago

Frequently asked questions

How do I find cheap flights to Washington County that have flexible change policies?
At Expedia, we've been channeling our inner yogi to provide you with the most flexible airfares on the market. Just check the "No change fee" box right under the filter heading "Flexible change policies" to find your dream flight to Washington County.
Which airlines fly to Washington County?
With a great range of airlines operating flights into or near Washington County, you're not short on choice:

  • Southwest Airlines - 2,214 flights to or near Washington County each month, including 2,214 flights to Lambert-St. Louis Intl. Airport (STL) per month.
  • American Airlines - 789 flights to or near Washington County each month, including 789 flights to Lambert-St. Louis Intl. Airport (STL) per month.
  • Delta Air Lines - 650 flights to or near Washington County each month, including 650 flights to Lambert-St. Louis Intl. Airport (STL) per month.

How can I find cheap tickets to Washington County?
You'll always nab an amazing deal with Expedia, but our "flexible dates" feature makes it that much easier. Enter your preferred travel date, then click on the flexible dates box above to compare prices for nearby days. ₩277,400 was the best price for a flight to Washington County in the last seven days.
How much is a flight to Washington County?
You could have scored a return ticket to Washington County from anywhere between ₩277,400 and ₩2,083,200 in the last seven days. For one-way trips departing from Seattle (SEA), the lowest amount paid during this time was ₩134,800.
What are the most popular airports to fly into in Washington County?
Book your flight to Lambert-St. Louis Intl. Airport (STL) and sample the best that Washington County has to offer. As the region's primary entry point, approximately 4,902 flights touch down here every month.
When is the cheapest time to fly to Washington County?
Fly out on a Tuesday to raise your chances of landing the cheapest flight to Washington County. Mondays are usually the next most affordable day to depart. Saturday is typically the costliest day to fly anywhere.
How much is a plane ticket to Washington County?
Fares to Washington County varied from ₩277,400 to ₩2,083,200 in the last seven days. Generally, the sooner you make a reservation, the better the deal.
What is the best time to go to Washington County?
July, August and September are the most popular months to venture to Sullivan, one of Washington County's most interesting cities. Summertime here starts June 20. Average temperatures vary from 65ºF to 85ºF across this season, so organize your travels around then if you're into warmer weather.
What months are the cheapest to book a flight to Washington County?
February is the ideal month to bag an awesome deal to Washington County. Keep in mind that the most expensive time to make a booking in the States isn't during the height of summer, but the month of December.

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