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Dulles Intl

$190+ 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 10/6. Fares are subject to change and may not be available on all flights or dates of travel.
STI — IAD
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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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 September 11, 2025.

Round-trip from

$497
(Delta)

One-way from

$190
(Kiwi.com)

Popular in

September

Cheapest in

June

Average price

$830
From Santiago de los Caballeros to Washington, D.C. Dulles Intl
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One-way flight from Santiago de los Caballeros to Washington, D.C. Dulles Intl
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Highest demand for flights based on searches. 14% potential increase in price ($93 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($33 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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 September 11, 2025.

This Delta deal was found by Cheapflights users on 9/11. 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.
Thu 11/276:35 amSTI - IAD
1 stop13h 33mDelta
Wed 12/315:06 pmIAD - STI
1 stop8h 45mDelta
Deal found 9/11$497
This Delta deal was found by Cheapflights users on 9/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/246:00 amSTI - IAD
1 stop13h 18mDelta
Fri 10/3112:09 pmIAD - STI
1 stop12h 15mDelta
Deal found 9/9$519
This Delta deal was found by Cheapflights users on 9/10. 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.
Sat 11/16:00 amSTI - IAD
1 stop13h 18mDelta
Wed 11/512:09 pmIAD - STI
1 stop6h 57mDelta
Deal found 9/10$521
This United Airlines deal was found by Cheapflights users on 9/11. 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.
Wed 10/12:07 pmSTI - IAD
1 stop8h 21mUnited Airlines
Mon 10/206:15 amIAD - STI
1 stop8h 57mUnited Airlines
Deal found 9/11$542
This American Airlines deal was found by Cheapflights users on 9/10. 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 11/11:14 pmSTI - IAD
2 stops20h 27mAmerican Airlines
Wed 11/55:29 pmIAD - STI
2 stops26h 22mAmerican Airlines
Deal found 9/10$544
This Delta deal was found by Cheapflights users on 9/10. 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.
Wed 10/18:40 pmSTI - IAD
1 stop15h 17mDelta
Sun 10/512:08 pmIAD - STI
1 stop12h 26mDelta
Deal found 9/10$589
This Mytrip deal was found by Cheapflights users on 9/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2512:10 pmSTI - IAD
3 stops23h 13mMultiple Airlines
Fri 9/264:43 pmIAD - STI
2 stops18h 20mMultiple Airlines
Deal found 9/11$621
This American Airlines deal was found by Cheapflights users on 9/11. 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.
Thu 11/274:33 pmSTI - IAD
2 stops27h 47mAmerican Airlines
Wed 12/314:34 pmIAD - STI
2 stops20h 50mAmerican Airlines
Deal found 9/11$627
This American Airlines deal was found by Cheapflights users on 9/10. 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.
Wed 10/11:29 pmSTI - IAD
2 stops19h 17mAmerican Airlines
Sun 10/55:26 pmIAD - STI
2 stops18h 47mAmerican Airlines
Deal found 9/10$636
This American Airlines deal was found by Cheapflights users on 9/11. 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.
Mon 12/226:00 amSTI - IAD
2 stops19h 04mAmerican Airlines
Tue 12/304:34 pmIAD - STI
2 stops20h 50mAmerican Airlines
Deal found 9/11$681

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 September 11, 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

Thu 11/27

6:35 am-7:08 pm

1 stop13h 33m

Washington, D.C. Dulles Intl

Wed 12/31

5:06 pm-2:51 am

1 stop8h 45m

$497

Santiago de los CaballerosWashington, D.C.

STI - IAD

STIIAD

Santiago de los Caballeros

Fri 10/24

6:00 am-7:18 pm

1 stop13h 18m

Washington, D.C. Dulles Intl

Fri 10/31

12:09 pm-12:24 am

1 stop12h 15m

$519

Santiago de los CaballerosWashington, D.C.

STI - IAD

STIIAD

Santiago de los Caballeros

Sat 11/1

6:00 am-7:18 pm

1 stop13h 18m

Washington, D.C. Dulles Intl

Wed 11/5

12:09 pm-8:06 pm

1 stop6h 57m

$521

Santiago de los CaballerosWashington, D.C.

STI - IAD

STIIAD

Santiago de los Caballeros

Wed 10/1

2:07 pm-10:28 pm

1 stop8h 21m

Washington, D.C. Dulles Intl

Mon 10/20

6:15 am-3:12 pm

1 stop8h 57m

$542

Santiago de los CaballerosWashington, D.C.

STI - IAD

STIIAD

Santiago de los Caballeros

Sat 11/1

1:14 pm-9:41 am

2 stops20h 27m

Washington, D.C. Dulles Intl

Wed 11/5

5:29 pm-8:51 pm

2 stops26h 22m

$544

Santiago de los CaballerosWashington, D.C.

STI - IAD

STIIAD

Santiago de los Caballeros

Fri 2/20

6:35 am-7:12 pm

1 stop13h 37m

Washington, D.C. Dulles Intl

Mon 2/23

12:30 pm-11:54 pm

1 stop10h 24m

$546

Santiago de los CaballerosWashington, D.C.

STI - IAD

STIIAD

Santiago de los Caballeros

Sat 10/18

11:43 am-11:29 pm

2 stops11h 46m

$211

Santiago de los CaballerosWashington, D.C.

STI - IAD

STIIAD

Santiago de los Caballeros

Fri 10/17

11:43 am-8:53 pm

2 stops33h 10m

$213

Santiago de los CaballerosWashington, D.C.

STI - IAD

STIIAD

Santiago de los Caballeros

Mon 10/27

11:43 am-8:20 pm

2 stops32h 37m

$228

Santiago de los CaballerosWashington, D.C.

STI - IAD

STIIAD

Santiago de los Caballeros

Fri 10/17

6:00 am-7:18 pm

1 stop13h 18m

$335

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 17 results
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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 $292). Flying from Santiago de los Caballeros to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $337). 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 September 11, 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.

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 0 different airlines.

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

    Departing from Santiago de los Caballeros to Washington, D.C. Dulles Intl Airport will take you 13h 33m. Airlines will cover a distance of 1410 mi.

  • 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 $292). Flying from Santiago de los Caballeros to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $337). 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 Washington, D.C. Dulles Intl Airport?

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Woodbridge
Alexandria
Arlington
Tysons
Silver Spring
Springfield
Gaithersburg
Fredericksburg
Linthicum Heights
Fairfax
Falls Church
Owings Mills
Manassas
Rockville
Hanover
Oxon Hill
Laurel
Towson
Dundalk
National Harbor

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