HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Trieste

$425+ Cheap flights from Dulles Intl (IAD) to Trieste (TRS)

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 7/1. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — TRS
Apr 11 — Apr 181
Sat 4/11
Sat 4/18
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Dulles Intl to Trieste 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 Trieste

Cheapest flights from Dulles Intl to Trieste
Explore the most affordable flight options available from Dulles Intl to Trieste. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 12, 2026.

This Mytrip deal was found by Cheapflights users on 3/8. 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.
Wed 4/221:20 pm
IAD
-
TRS
2 stops19h 40m
Multiple Airlines
Wed 4/297:15 pm
TRS
-
IAD
3 stops30h 35m
Multiple Airlines
Deal found 3/8$737
This TAP AIR PORTUGAL deal was found by Cheapflights users on 3/11. 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 TAP AIR PORTUGAL is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1010:35 pm
IAD
-
TRS
2 stops18h 20m
TAP AIR PORTUGAL
Wed 8/2611:15 am
TRS
-
IAD
2 stops33h 55m
TAP AIR PORTUGAL
Deal found 3/11$919
This Ovago deal was found by Cheapflights users on 3/9. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/244:30 pm
IAD
-
TRS
1 stop16h 00m
ITA Airways
Fri 5/16:35 am
TRS
-
IAD
1 stop13h 55m
ITA Airways
Deal found 3/9$934
This KAYAK deal was found by Cheapflights users on 3/11. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/95:55 pm
IAD
-
TRS
1 stop13h 50m
Lufthansa
Fri 8/286:10 am
TRS
-
IAD
1 stop13h 25m
Lufthansa
Deal found 3/11$960
This KAYAK deal was found by Cheapflights users on 3/11. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1110:35 pm
IAD
-
TRS
2 stops18h 20m
TAP AIR PORTUGAL
Thu 8/276:35 am
TRS
-
IAD
2 stops20h 00m
TAP AIR PORTUGAL
Deal found 3/11$964
This ITA Airways deal was found by Cheapflights users on 3/8. 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 ITA Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/174:30 pm
IAD
-
TRS
1 stop11h 55m
ITA Airways
Tue 4/216:35 am
TRS
-
IAD
1 stop13h 55m
ITA Airways
Deal found 3/8$967
This KAYAK deal was found by Cheapflights users on 3/11. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/910:35 pm
IAD
-
TRS
2 stops37h 55m
TAP AIR PORTUGAL
Tue 8/256:35 am
TRS
-
IAD
2 stops20h 00m
TAP AIR PORTUGAL
Deal found 3/11$968
This KAYAK deal was found by Cheapflights users on 3/11. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/95:55 pm
IAD
-
TRS
1 stop13h 50m
Lufthansa
Wed 8/262:40 pm
TRS
-
IAD
2 stops26h 30m
Lufthansa
Deal found 3/11$976
This KAYAK deal was found by Cheapflights users on 3/11. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/125:55 pm
IAD
-
TRS
1 stop14h 05m
Lufthansa
Mon 8/242:50 pm
TRS
-
IAD
1 stop31h 15m
Lufthansa
Deal found 3/11$980

Find flight deals from Dulles Intl to Trieste

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to Trieste (TRS). 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 March 12, 2026.

Most accurate provider

AranGrant
2 stars

Most trusted provider

AranGrant
2 stars

Round-trip from

$737
(Mytrip)
Provider with most accurate pricing for Washington, D.C. Dulles Intl-Trieste Ronchi dei Legionari flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. Dulles Intl-Trieste Ronchi dei Legionari flights.
Search Deals
From Washington, D.C. Dulles Intl to Trieste Ronchi dei Legionari
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Dulles Intl to Trieste 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 March 12, 2026.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Trieste that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.Trieste

IAD - TRS

IADTRS

Washington, D.C. Dulles Intl

Wed 4/22

8:20 pm-10:25 pm

2 stops20h 05m

Trieste Ronchi dei Legionari

Wed 4/29

6:10 am-5:00 pm

2 stops16h 50m

$910
Quickest round-trip

Washington, D.C.Trieste

IAD - TRS

IADTRS

Washington, D.C. Dulles Intl

Fri 4/17

4:30 pm-2:30 pm

1 stop16h 00m

Trieste Ronchi dei Legionari

Tue 4/21

6:35 am-2:30 pm

1 stop13h 55m

$967

Washington, D.C.Trieste

IAD - TRS

IADTRS

Washington, D.C. Dulles Intl

Sun 6/21

10:20 pm-11:05 pm

3 stops18h 45m

Trieste Ronchi dei Legionari

Fri 7/3

3:45 pm-7:00 pm

2 stops33h 15m

$1,192

Washington, D.C.Trieste

IAD - TRS

IADTRS

Washington, D.C. Dulles Intl

Sun 5/24

4:30 pm-10:55 pm

1 stop24h 25m

Trieste Ronchi dei Legionari

Thu 7/23

6:35 am-2:30 pm

1 stop13h 55m

$1,328

Washington, D.C.Trieste

IAD - TRS

IADTRS

Washington, D.C. Dulles Intl

Tue 5/26

4:30 pm-10:25 am

1 stop11h 55m

Trieste Ronchi dei Legionari

Sat 7/25

7:15 pm-2:30 pm

1 stop25h 15m

$1,378
Cheapest one-way

Washington, D.C.Trieste

IAD - TRS

IADTRS

Washington, D.C. Dulles Intl

Sat 6/13

10:35 pm-2:30 pm

2 stops33h 55m

$830

Washington, D.C.Trieste

IAD - TRS

IADTRS

Washington, D.C. Dulles Intl

Sat 4/11

10:35 pm-10:55 pm

2 stops18h 20m

$886

Washington, D.C.Trieste

IAD - TRS

IADTRS

Washington, D.C. Dulles Intl

Mon 6/15

4:30 pm-2:30 pm

1 stop16h 00m

$896

Washington, D.C.Trieste

IAD - TRS

IADTRS

Washington, D.C. Dulles Intl

Sun 6/14

4:30 pm-6:30 pm

1 stop20h 00m

$896

Washington, D.C.Trieste

IAD - TRS

IADTRS

Washington, D.C. Dulles Intl

Mon 6/15

10:35 pm-6:30 pm

2 stops37h 55m

$920

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/12

Showing 1-10 of 13 resultsSorted by cheapest first
1
2
  • Most accurate provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-Trieste flights, users find the pricing of AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on Washington, D.C. Dulles Intl Airport-Trieste flight deals on Cheapflights vs. AranGrant 90-95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-Trieste 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-Trieste flights, Cheapflights users trust AranGrant the most. AranGrant 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-Trieste 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 Trieste

Have a flexible travel schedule? Discover the best time to fly to Trieste 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 Trieste

What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to Trieste?

Currently, March is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Trieste (average of $445). Flying from Washington, D.C. Dulles Intl Airport to Trieste in December is currently the most expensive (average of $792). 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.

Reviews of airlines servicing Trieste

Get insights into the airlines that provide service to Trieste. 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 Trieste. Reviews last updated March 12, 2026.
Peruse reviews from past customers who have flown with ITA Airways from Washington, D.C. Dulles Intl Airport to Trieste to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
ITA Airways
6.7
Okay
1,167 reviews

Food

6.0

Boarding

6.9

Overall

6.7

Entertainment

6.2

Crew

7.4

Comfort

6.7

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2026

CAI - FCO

Food was poor and hard to take for such a long flight. Entertainment was not permitted until in the air, so during long boarding process not able to watch anything. Entertainment options were very limited, and foreign films did not have English subtitles which cut already limited options down by half.
ITA Airways
6.7
Okay
1,167 reviews
ITA Airways
6.7
Okay
1,167 reviews

Food

6.0

Boarding

6.9

Overall

6.7

Entertainment

6.2

Crew

7.4

Comfort

6.7

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2026

CAI - FCO

Food was poor and hard to take for such a long flight. Entertainment was not permitted until in the air, so during long boarding process not able to watch anything. Entertainment options were very limited, and foreign films did not have English subtitles which cut already limited options down by half.

Related info for your journey

Find useful and relevant information for your journey from Dulles Intl to Trieste. 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 Trieste from Washington, D.C. Dulles Intl?

    Trieste Ronchi dei Legionari (TRS) is the airport you will fly into if you book a flight from Washington, D.C. Dulles Intl to Trieste. You should not have trouble finding flights to Ronchi dei Legionari from Washington, D.C. Dulles Intl; the airport handles an average of 0 inbound flights from Washington, D.C. Dulles Intl per day. You should also have plenty of airline options to choose from since 1 airline has flights to the Trieste airport from Washington, D.C. Dulles Intl. It is only a 18.2 mi journey from Ronchi dei Legionari (TRS) to Trieste’s city center.

  • How long is the flight from Washington, D.C. Dulles Intl Airport to Trieste?

    There are many flights that can get you from Washington, D.C. Dulles Intl Airport to Trieste in 16h. Fly via ITA Airways to get the fastest option. The distance between Washington, D.C. Dulles Intl Airport and Trieste is about 4403 mi.

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

    According to our current data, ITA Airways ($664), offers the cheapest pricing from Washington, D.C. Dulles Intl Airport to Trieste.

  • Can I find deals for flights from Dulles Intl to Trieste that include hotel bookings?

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

  • How can I find direct flights from Dulles Intl to Trieste?

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

  • Can I find deals for business class flights from Dulles Intl to Trieste?

    Yes. Cheapflights offers flight deals from Dulles Intl to Trieste 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 Trieste?

    Currently, March is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Trieste (average of $445). Flying from Washington, D.C. Dulles Intl Airport to Trieste in December is currently the most expensive (average of $792). 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.

Alternative routes for Dulles Intl to Trieste

See prices for flight routes from nearby airports that may be better suited for you.
Dulles Intl to Vicenza flights
Baltimore to Vicenza flights

Top airline flying from Dulles Intl to Trieste

Discover the top airline that operate flights from Dulles Intl to Trieste. 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 March 12, 2026.
AirlineCheapestAverageFlexibilityOn-time
ITA AirwaysCheapest$664Average$914FlexibilityNo cancel feeOn-time81%

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.