HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Dulles Intl

$174+ Cheap flights from Santiago de los Caballeros (STI) to Dulles Intl (IAD)

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 7/16. Fares are subject to change and may not be available on all flights or dates of travel.
STI — IAD
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Santiago de los Caballeros to Dulles Intl 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 Santiago de los Caballeros to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from Santiago de los Caballeros (STI) to Dulles Intl (IAD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated June 12, 2025.

Round-trip from

$539
(Mytrip)

One-way from

$174
(Priceline)

Popular in

December

Cheapest in

August

Average price

$406
From Santiago de los Caballeros to Washington, D.C. Dulles Intl
Search Deals
One-way flight from Santiago de los Caballeros to Washington, D.C. Dulles Intl
Search Deals
Highest demand for flights based on searches. 21% potential increase in price ($166 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 16% potential price decrease ($90 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2025
Search Deals

Find flight deals from Santiago de los Caballeros to Dulles Intl

Cheapest flights from Santiago de los Caballeros to Dulles Intl
Explore the most affordable flight options available from Santiago de los Caballeros to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

This Trip.com deal was found by Cheapflights users on 6/11. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/182:10 pmSTI - IAD
1 stop21h 18mFrontier
Tue 6/2412:48 pmIAD - STI
1 stop24h 02mFrontier
Deal found 6/11$319
This Mytrip deal was found by Cheapflights users on 6/9. 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.
Fri 7/2510:55 amSTI - IAD
2 stops33h 58mMultiple Airlines
Fri 8/14:46 pmIAD - STI
3 stops41h 04mMultiple Airlines
Deal found 6/9$539
This American Airlines deal was found by Cheapflights users on 6/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/177:05 amSTI - IAD
2 stops34h 06mAmerican Airlines
Thu 6/261:08 pmIAD - STI
2 stops31h 57mAmerican Airlines
Deal found 6/11$755
This United Airlines deal was found by Cheapflights users on 6/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/176:00 amSTI - IAD
1 stop8h 27mUnited Airlines
Sun 6/229:00 amIAD - STI
1 stop6h 12mUnited Airlines
Deal found 6/11$794
This Delta deal was found by Cheapflights users on 6/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/178:53 pmSTI - IAD
1 stop15h 06mDelta
Tue 6/2412:13 pmIAD - STI
1 stop7h 14mDelta
Deal found 6/11$973

Cheapflights Fare Finder

Customize your flight search to find flights from Santiago de los Caballeros to Dulles Intl 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 June 12, 2025.
Use the filters below to find and compare flights from Santiago de los Caballeros to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Santiago de los Caballeros

Fly to

Dulles Intl

Route

Depart

Return

Price

Santiago de los CaballerosWashington, D.C.

STI - IAD

STIIAD

Santiago de los Caballeros

Fri 7/25

10:55 am-8:53 pm

2 stops33h 58m

Washington, D.C. Dulles Intl

Fri 8/1

4:46 pm-9:50 am

3 stops41h 04m

$539

Santiago de los CaballerosWashington, D.C.

STI - IAD

STIIAD

Santiago de los Caballeros

Tue 6/24

7:05 am-11:59 pm

2 stops16h 54m

Washington, D.C. Dulles Intl

Thu 6/26

1:08 pm-9:05 pm

2 stops31h 57m

$755

Santiago de los CaballerosWashington, D.C.

STI - IAD

STIIAD

Santiago de los Caballeros

Tue 6/24

6:00 am-2:27 pm

1 stop8h 27m

Washington, D.C. Dulles Intl

Sun 6/29

8:35 am-3:12 pm

1 stop6h 37m

$794

Santiago de los CaballerosWashington, D.C.

STI - IAD

STIIAD

Santiago de los Caballeros

Sun 6/22

2:34 pm-11:59 am

1 stop21h 25m

Washington, D.C. Dulles Intl

Tue 6/24

12:13 pm-7:27 pm

1 stop7h 14m

$1,116

Santiago de los CaballerosWashington, D.C.

STI - IAD

STIIAD

Santiago de los Caballeros

Wed 7/16

2:10 pm-11:31 am

1 stop21h 21m

$174

Santiago de los CaballerosWashington, D.C.

STI - IAD

STIIAD

Santiago de los Caballeros

Wed 7/16

10:55 am-11:08 am

2 stops24h 13m

$240

Santiago de los CaballerosWashington, D.C.

STI - IAD

STIIAD

Santiago de los Caballeros

Mon 7/14

2:07 pm-10:27 pm

1 stop8h 20m

$339

Santiago de los CaballerosWashington, D.C.

STI - IAD

STIIAD

Santiago de los Caballeros

Thu 7/17

7:04 am-11:58 pm

2 stops16h 54m

$397

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Best time to book a flight from Santiago de los Caballeros to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Santiago de los Caballeros 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 Santiago de los Caballeros to Washington, D.C. Dulles Intl Airport

What is the cheapest month to book a flight from Santiago de los Caballeros to Washington, D.C. Dulles Intl Airport?

Currently, August is the cheapest month in which you can book a flight from Santiago de los Caballeros to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Santiago de los Caballeros to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $349). 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 STI to IAD?

Find hourly flight availability from Santiago de los Caballeros to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 12, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 42% on flights from Santiago de los Caballeros to Washington, D.C. Dulles Intl Airport by exploring options for tickets at noon.

Rainfall in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 2.6 in.

Temperature in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

Reviews of airlines servicing Dulles Intl

Get insights into the airlines that provide service to Dulles Intl. 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 Dulles Intl. Reviews last updated June 12, 2025.
Delta
8.0
Very good
7,946 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,946 reviews
Delta
8.0
Very good
7,946 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,790 reviews
Delta
8.0
Very good
7,946 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,946 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Frontier
6.0
Okay
3,295 reviews
Delta
8.0
Very good
7,946 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

Find useful and relevant information for your journey from Santiago de los Caballeros to Dulles Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Santiago de los Caballeros to Washington, D.C. Dulles Intl?

    Located just 6.8 mi from the city center, Santiago de los Caballeros is the airport most travelers will use when flying to Washington, D.C. Dulles Intl from Santiago de los Caballeros. Booking flights from Santiago (STI) to Washington, D.C. Dulles Intl should be relatively easy as there are 0 daily outbound flights to Washington, D.C. Dulles Intl from 1 airline.

  • What are the cheapest airlines flying from Santiago de los Caballeros to Washington, D.C. Dulles Intl Airport round-trip?

    American Airlines, at $755, was found to be the cheapest airline from Santiago de los Caballeros to Washington, D.C. Dulles Intl Airport.Alternate airlines to your destination round-trip include United Airlines and Delta.

  • What are the cheapest airlines to fly from Santiago de los Caballeros to Washington, D.C. Dulles Intl Airport one-way?

    The cheapest airlines for a one-way flight from Santiago de los Caballeros to Washington, D.C. Dulles Intl Airport are Frontier ($174), United Airlines ($339), and American Airlines ($397).

  • Can I find deals for flights from Santiago de los Caballeros to Dulles Intl that include hotel bookings?

    Yes. In addition to deals on Santiago de los Caballeros to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Santiago de los Caballeros to Dulles Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Santiago de los Caballeros to Dulles Intl.

  • Can I find deals for business class flights from Santiago de los Caballeros to Dulles Intl?

    Yes. Cheapflights offers flight deals from Santiago de los Caballeros to Dulles Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Santiago de los Caballeros to Washington, D.C. Dulles Intl Airport?

    Currently, August is the cheapest month in which you can book a flight from Santiago de los Caballeros to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Santiago de los Caballeros to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $349). 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.

See more FAQs

Traveling to a place near Santiago de los Caballeros?

Book flights to Santiago de los Caballeros if you plan to visit one of these locations
Arlington
Alexandria
Woodbridge
Tysons
Silver Spring
Linthicum Heights
Fredericksburg
Gaithersburg
Fairfax
Falls Church
Easton
Herndon
Towson
Sterling
Bowie
Rockville
Reston
National Harbor
Springfield
Manassas

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.

Top airline flying from Santiago de los Caballeros to Dulles Intl

Discover the top airline that operate flights from Santiago de los Caballeros to Dulles Intl. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$504Average$643FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.