--- title: "Washington to Yeosu cheap flights (IAD to RSU) - Expedia" description: "Cheap Flights from Washington (IAD) to Yeosu (RSU) start at for one-way and for round trip. Earn your airline miles on top of our rewards!" canonical: "https://www.expedia.com/lp/flights/iad/rsu/washington-to-yeosu" language: en-US market: US currency: USD prices_as_of: 2026-11-12T22:49:43Z --- # Cheap Flights from Washington (IAD) to Yeosu (RSU) ![A coastal cityscape with a rocky shoreline, a bridge, and a distant mountain range.](https://images.trvl-media.com/place/3042/10773ff2-1fa7-4798-9c83-4cc25586c5f1.jpg?impolicy=fcrop&w=1200&h=500&q=medium) ## Popular airlines from Washington Dulles Intl. Airport (IAD) to Yeosu (RSU) [American Airlines](https://www.expedia.com/Flights-Search?leg1=from:IAD,to:RSU,departure:11/26/2026TANYT&leg2=from:RSU,to:IAD,departure:12/3/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AA"}}]) [United](https://www.expedia.com/Flights-Search?leg1=from:IAD,to:RSU,departure:11/26/2026TANYT&leg2=from:RSU,to:IAD,departure:12/3/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"UA"}}]) [Southwest Airlines](https://www.expedia.com/Flights-Search?leg1=from:IAD,to:RSU,departure:11/26/2026TANYT&leg2=from:RSU,to:IAD,departure:12/3/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"WN"}}]) [Delta](https://www.expedia.com/Flights-Search?leg1=from:IAD,to:RSU,departure:11/26/2026TANYT&leg2=from:RSU,to:IAD,departure:12/3/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"DL"}}]) [Frontier Airlines](https://www.expedia.com/Flights-Search?leg1=from:IAD,to:RSU,departure:11/26/2026TANYT&leg2=from:RSU,to:IAD,departure:12/3/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"F9"}}]) [JetBlue Airways](https://www.expedia.com/Flights-Search?leg1=from:IAD,to:RSU,departure:11/26/2026TANYT&leg2=from:RSU,to:IAD,departure:12/3/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"B6"}}]) [Alaska Airlines](https://www.expedia.com/Flights-Search?leg1=from:IAD,to:RSU,departure:11/26/2026TANYT&leg2=from:RSU,to:IAD,departure:12/3/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AS"}}]) ### Be in the know Get alerts if flight prices drop or rise\* ### Book smarter Save up to 30% on select hotels after you book a flight\* ### Earn twice Earn your airline miles on top of our OneKeyCash [Learn about One Key](https://www.expedia.com/welcome-one-key) ## Book with confidence ### Washington to Yeosu Flights #### The cheapest times to fly from Washington to Yeosu On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Washington to Yeosu are during the month of . You can find some of the cheapest flights from Washington to Yeosu with Expedia's search tool and vast selection of airlines. #### The best time to book a flight from Washington to Yeosu Sunday is one of the best days to book for cheap flights from Washington to Yeosu: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance. #### How to find cheap round-trip tickets from Washington to Yeosu Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Washington to Yeosu in 2026\. You can also book with separate airlines for your outbound and return journeys, from one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference\*. This is available for a small fee, and is free to One Key Gold and Platinum tier members. Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Washington to Yeosu flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps. You could also save big by booking one of Expedia's [vacation packages](https://www.expedia.com/package-deals). Bundling together your Washington to Yeosu airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures. *\*Terms apply.* *Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023\. The percentages you see are averages.* ## Frequently Asked Questions ### How much does a flight from Washington, DC (IAD-Washington Dulles Intl.) to Yeosu (RSU) cost? You can find cheap one-way flights and cheap return flights IAD to RSU with Expedia. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see our cheapest fares first, and use the Price Tracking tool to receive alerts when IAD to RSU ticket fares go up or down. ### What is the cheapest month to fly from Washington, DC (IAD-Washington Dulles Intl.) to Yeosu (RSU)? The cheapest month to fly from IAD to RSU is when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you're able to. Use the calendar view in your search to see which months have low fares on this route. ### Which airlines fly direct from Washington, DC (IAD-Washington Dulles Intl.) to Yeosu (RSU)? Enter IAD to RSU and your travel dates, then apply the 'Nonstop' filter to see only direct flights. ### What is the cheapest airline that flies from Washington, DC (IAD-Washington Dulles Intl.) to Yeosu (RSU)? United is the airline that flies from Washington, DC (IAD) to Yeosu (RSU). Use Expedia's flight search tool to compare airlines on this route and find our cheapest option for your trip. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget. *\*Prices based on flights available on Expedia in the last year.* ### How do I find cheap flights from Washington, DC (IAD-Washington Dulles Intl.) to Yeosu (RSU)? To find a cheap flight from Washington, DC (IAD-Washington Dulles Intl.) to Yeosu (RSU), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up [Price Tracking](https://www.expedia.com/why/price-tracking) and receive alerts when fares go up or down. ### What is the best time to fly from Washington, DC (IAD-Washington Dulles Intl.) to Yeosu (RSU)? The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience. ### What is the earliest flight from Washington, DC (IAD-Washington Dulles Intl.) to Yeosu (RSU)? Sort flights by "Departure (earliest)" on Expedia to find the earliest flight from IAD to RSU. To compare more early flights, use the "Early Morning" and "Morning" filters in your search. ### Can you fly business or first class from Washington, DC (IAD-Washington Dulles Intl.) to Yeosu (RSU)? Select the "Business class" and "First class" filters when looking for IAD to RSU flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip. ### How do I earn miles on a Washington, DC (IAD-Washington Dulles Intl.) to Yeosu (RSU) flight with Expedia? It's easy to earn miles on a Washington, DC (IAD-Washington Dulles Intl.) to Yeosu (RSU) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of [One Key™](https://www.expedia.com/welcome-one-key), you can also earn OneKeyCash™\* on top of your airline miles when you book with Expedia. \*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands. ### Is it cheaper to buy a plane ticket from Washington, DC (IAD-Washington Dulles Intl.) to Yeosu (RSU) at the last minute? Typically, booking a last minute flight from Washington, DC (IAD-Washington Dulles Intl.) to Yeosu (RSU) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare. ### Is it cheaper to book a Washington, DC (IAD-Washington Dulles Intl.) to Yeosu (RSU) flight and hotel package? Securing a Washington, DC (IAD-Washington Dulles Intl.) to Yeosu (RSU) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars. ### Can I cancel or change the date of my flight from Washington, DC (IAD-Washington Dulles Intl.) to Yeosu (RSU)? If you booked your Washington, DC (IAD-Washington Dulles Intl.) to Yeosu (RSU) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in [your itinerary](https://www.expedia.com/trips) or confirmation email. Or, head to our [Customer Service portal](https://www.expedia.com/helpcenter/) if you'd like more information. ## Travel information | Origin airport | Washington Dulles Intl. Airport | | ------------------- | ------------------------------- | | Destination airport | Yeosu | | Distance | 7,092 miles away | ## Explore a world of travel with Expedia - [Lodging](?equalTargetTab=tab-0) - [Flights](?equalTargetTab=tab-1) - [Packages](?equalTargetTab=tab-2) - [Cars](?equalTargetTab=tab-3) - [Vacation Rentals](?equalTargetTab=tab-4) - [Things to Do](?equalTargetTab=tab-5) - [Guest Houses in Yeosu](https://www.expedia.com/Yeosu-Guest-Houses.d3042-aaGuestHouses.Travel-Guide-Accommodation) - [4 Star Hotels in Wau](https://www.expedia.com/4Star-Wau-Hotels.s40-0-d3000747573.Travel-Guide-Filter-Hotels) - [Chinnam Hotels](https://www.expedia.com/Chinnam-Hotels.d3000733661.Travel-Guide-Hotels) - [Hak-Dong Hotels](https://www.expedia.com/Hak-Dong-Yeosu-Hotels.0-n553248635976007437-0.Travel-Guide-Filter-Hotels) - [Honeymoon Resorts & in Yeosu](https://www.expedia.com/Yeosu-Hotels-Honeymoon-Hotels.0-0-d3042-tHoneymoonHotels.Travel-Guide-Filter-Hotels) - [Cheap Hotels in Suncheon](https://www.expedia.com/Suncheon-Hotels-Cheap-Hotels.0-0-d6084632-tCheapHotels.Travel-Guide-Filter-Hotels) - 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