HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Santiago de los Caballeros

$170+ Cheap flights from Dulles Intl (IAD) to Santiago de los Caballeros (STI)

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 11/19. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — STI
Nov 27 — Dec 41
Thu 11/27
Thu 12/4
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to Santiago de los Caballeros (STI). 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 October 28, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$450
(Copa Airlines)

One-way from

$170
(Kiwi.com)

Popular in

July

Cheapest in

May

Average price

$580
Provider with most accurate pricing for Washington, D.C. Dulles Intl-Santiago de los Caballeros flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. Dulles Intl-Santiago de los Caballeros flights.
Search Deals
From Washington, D.C. Dulles Intl to Santiago de los Caballeros
Search Deals
One-way flight from Washington, D.C. Dulles Intl to Santiago de los Caballeros
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($113 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Find flight deals from Dulles Intl to Santiago de los Caballeros

Cheapest flights from Dulles Intl to Santiago de los Caballeros
Explore the most affordable flight options available from Dulles Intl to Santiago de los Caballeros. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 28, 2025.

This American Airlines deal was found by Cheapflights users on 10/28. 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.
Thu 11/276:34 amIAD - STI
2 stops31h 58mAmerican Airlines
Wed 12/34:32 pmSTI - IAD
2 stops17h 12mAmerican Airlines
Deal found 10/28$488
This American Airlines deal was found by Cheapflights users on 10/26. 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.
Fri 11/288:09 pmIAD - STI
2 stops18h 23mAmerican Airlines
Thu 12/114:32 pmSTI - IAD
2 stops18h 48mAmerican Airlines
Deal found 10/26$492
This American Airlines deal was found by Cheapflights users on 10/27. 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.
Mon 12/85:29 pmIAD - STI
2 stops21h 03mAmerican Airlines
Sun 2/84:33 pmSTI - IAD
2 stops19h 25mAmerican Airlines
Deal found 10/27$497
This American Airlines deal was found by Cheapflights users on 10/27. 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.
Fri 12/55:35 pmIAD - STI
2 stops20h 57mAmerican Airlines
Mon 12/86:00 amSTI - IAD
2 stops18h 08mAmerican Airlines
Deal found 10/27$512
This American Airlines deal was found by Cheapflights users on 10/26. 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.
Sat 12/68:05 pmIAD - STI
2 stops18h 27mAmerican Airlines
Sun 12/144:32 pmSTI - IAD
2 stops18h 48mAmerican Airlines
Deal found 10/26$517
This United Airlines deal was found by Cheapflights users on 10/26. 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.
Wed 11/196:00 amIAD - STI
1 stop7h 53mUnited Airlines
Wed 1/284:00 pmSTI - IAD
1 stop8h 18mUnited Airlines
Deal found 10/26$529
This American Airlines deal was found by Cheapflights users on 10/28. 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.
Mon 11/172:16 pmIAD - STI
2 stops24h 17mAmerican Airlines
Tue 12/24:35 pmSTI - IAD
2 stops18h 45mAmerican Airlines
Deal found 10/28$530
This American Airlines deal was found by Cheapflights users on 10/26. 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.
Thu 11/206:44 amIAD - STI
2 stops15h 12mAmerican Airlines
Mon 11/246:20 amSTI - IAD
2 stops17h 47mAmerican Airlines
Deal found 10/26$544
This Delta deal was found by Cheapflights users on 10/27. 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.
Mon 11/1012:11 pmIAD - STI
1 stop11h 48mDelta
Thu 11/276:40 amSTI - IAD
1 stop13h 28mDelta
Deal found 10/27$548
This American Airlines deal was found by Cheapflights users on 10/26. 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.
Mon 11/105:29 pmIAD - STI
2 stops21h 04mAmerican Airlines
Fri 11/144:35 pmSTI - IAD
2 stops17h 06mAmerican Airlines
Deal found 10/26$552
This American Airlines deal was found by Cheapflights users on 10/27. 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.
Thu 11/276:34 amIAD - STI
2 stops31h 58mAmerican Airlines
Mon 12/14:35 pmSTI - IAD
2 stops19h 07mAmerican Airlines
Deal found 10/27$563
This American Airlines deal was found by Cheapflights users on 10/28. 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.
Thu 11/136:24 amIAD - STI
2 stops8h 09mAmerican Airlines
Tue 11/187:00 amSTI - IAD
2 stops17h 07mAmerican Airlines
Deal found 10/28$564

Cheapflights Fare Finder

 
Customize your flight search to find flights from Dulles Intl to Santiago de los Caballeros 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 October 28, 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Santiago de los Caballeros that are best for you.

Fly from

Dulles Intl

Fly to

Santiago de los Caballeros

Route

Depart

Return

Price

Washington, D.C.Santiago de los Caballeros

IAD - STI

IADSTI

Washington, D.C. Dulles Intl

Sat 12/6

8:05 pm-8:33 pm

2 stops23h 28m

Santiago de los Caballeros

Sun 12/14

4:32 pm-1:34 pm

2 stops22h 02m

$517

Washington, D.C.Santiago de los Caballeros

IAD - STI

IADSTI

Washington, D.C. Dulles Intl

Wed 11/19

6:00 am-2:53 pm

1 stop7h 53m

Santiago de los Caballeros

Wed 1/28

4:00 pm-11:18 pm

1 stop8h 18m

$529

Washington, D.C.Santiago de los Caballeros

IAD - STI

IADSTI

Washington, D.C. Dulles Intl

Wed 11/19

2:16 pm-3:32 pm

2 stops24h 16m

Santiago de los Caballeros

Wed 1/28

4:33 pm-10:58 am

2 stops19h 25m

$530

Washington, D.C.Santiago de los Caballeros

IAD - STI

IADSTI

Washington, D.C. Dulles Intl

Thu 11/20

6:44 am-10:56 pm

2 stops15h 12m

Santiago de los Caballeros

Mon 11/24

6:20 am-11:07 pm

2 stops17h 47m

$544

Washington, D.C.Santiago de los Caballeros

IAD - STI

IADSTI

Washington, D.C. Dulles Intl

Tue 12/2

12:19 pm-1:08 am

1 stop11h 49m

Santiago de los Caballeros

Mon 12/8

8:57 pm-11:39 am

1 stop15h 42m

$548

Washington, D.C.Santiago de los Caballeros

IAD - STI

IADSTI

Washington, D.C. Dulles Intl

Mon 11/10

6:00 am-2:53 pm

1 stop7h 53m

Santiago de los Caballeros

Fri 11/14

4:00 pm-10:58 pm

1 stop7h 58m

$548

Washington, D.C.Santiago de los Caballeros

IAD - STI

IADSTI

Washington, D.C. Dulles Intl

Mon 11/17

12:11 pm-12:59 am

1 stop11h 48m

Santiago de los Caballeros

Tue 12/2

6:35 am-7:19 pm

1 stop13h 44m

$548

Washington, D.C.Santiago de los Caballeros

IAD - STI

IADSTI

Washington, D.C. Dulles Intl

Mon 11/10

12:11 pm-12:59 am

1 stop11h 48m

Santiago de los Caballeros

Thu 11/27

6:40 am-7:08 pm

1 stop13h 28m

$548

Washington, D.C.Santiago de los Caballeros

IAD - STI

IADSTI

Washington, D.C. Dulles Intl

Thu 11/13

8:09 pm-3:33 pm

2 stops18h 24m

Santiago de los Caballeros

Tue 11/18

7:00 am-11:07 pm

2 stops17h 07m

$565

Washington, D.C.Santiago de los Caballeros

IAD - STI

IADSTI

Washington, D.C. Dulles Intl

Fri 10/31

12:09 pm-7:06 pm

1 stop6h 57m

Santiago de los Caballeros

Wed 11/5

9:31 pm-11:57 am

1 stop15h 26m

$566

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/26

Showing 1-10 of 15 results
1
2

Compare providers for flights from Dulles Intl to Santiago de los Caballeros

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Dulles Intl to Santiago de los Caballeros in October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-Santiago de los Caballeros flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Washington, D.C. Dulles Intl Airport-Santiago de los Caballeros flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-Santiago de los Caballeros flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-Santiago de los Caballeros flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Washington, D.C. Dulles Intl Airport-Santiago de los Caballeros flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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

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

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

Currently, August is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Santiago de los Caballeros (average of $214). Flying from Washington, D.C. Dulles Intl Airport to Santiago de los Caballeros in September is currently the most expensive (average of $580). 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 IAD to STI?

Find hourly flight availability from Dulles Intl to Santiago de los Caballeros. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 28, 2025.

A simple way to save on the total cost of your ticket is to fly from Washington, D.C. Dulles Intl Airport to Santiago de los Caballeros at noon. If you’re flexible enough to do this you can expect to save up to 44% on your trip compared to booking a flight in the morning.

Reviews of airlines servicing Santiago de los Caballeros

Get insights into the airlines that provide service to Santiago de los Caballeros. 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 Santiago de los Caballeros. Reviews last updated October 28, 2025.
Read through reviews of airlines operating flights from Washington, D.C. Dulles Intl Airport to Santiago de los Caballeros, such as United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,001 reviews

Crew

8.1

Entertainment

7.1

Food

6.6

Boarding

7.7

Comfort

7.3

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000
United Airlines
7.4
Good
9,001 reviews
United Airlines
7.4
Good
9,001 reviews

Crew

8.1

Entertainment

7.1

Food

6.6

Boarding

7.7

Comfort

7.3

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Sebrena,Oct 2025

IAH - RSW

The worst that I have ever experienced in my life so bad if it was free I'm not ever going to use your Airline again I dont believe ..... very disappointed 😞 😔0000000000000

Related info for your journey

Find useful and relevant information for your journey from Dulles Intl to Santiago de los Caballeros. 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 into for flights to Santiago de los Caballeros from Washington, D.C. Dulles Intl?

    For a flight from Washington, D.C. Dulles Intl to Santiago de los Caballeros, you will be flying into Santiago. Santiago de los Caballeros (STI) is just 6.8 mi from the center of the city. Santiago is the only Santiago de los Caballeros airport and it handles 0 inbound flights from Washington, D.C. Dulles Intl per day. 1 airline has flights to Santiago de los Caballeros from Washington, D.C. Dulles Intl on a regular basis.

  • How long is the flight from Washington, D.C. Dulles Intl Airport to Santiago de los Caballeros?

    For as low as $529, American Airlines can have you in Santiago de los Caballeros from Washington, D.C. Dulles Intl Airport in 7h 53m. The distance from Washington, D.C. Dulles Intl Airport to Santiago de los Caballeros is about 1410 mi. This flight may include one or multiple stops.

  • What is the cheapest airline to fly from Washington, D.C. Dulles Intl Airport to Santiago de los Caballeros round-trip?

    Cheapflights users have booked flights from Washington, D.C. Dulles Intl Airport to Santiago de los Caballeros round-trip from $488. United Airlines is priced at 29% lower than the current average price of a flight leaving 3 months from now.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Dulles Intl to Santiago de los Caballeros 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 Washington, D.C. Dulles Intl Airport to Santiago de los Caballeros?

    Currently, August is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Santiago de los Caballeros (average of $214). Flying from Washington, D.C. Dulles Intl Airport to Santiago de los Caballeros in September is currently the most expensive (average of $580). 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

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 Dulles Intl to Santiago de los Caballeros

Discover the top airline that operate flights from Dulles Intl to Santiago de los Caballeros. 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 October 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$488Average$734FlexibilityNo 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.