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Trieste

$665+ 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 5/5. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — TRS
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
1 adult, Economy
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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 December 12, 2025.

This KAYAK deal was found by Cheapflights users on 12/10. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/301:30 pmIAD - TRS
2 stops47h 00mTurkish Airlines
Sat 1/311:15 amTRS - IAD
2 stops54h 30mTurkish Airlines
Deal found 12/10$2,133

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 December 12, 2025.

Most accurate provider

AranGrant
2 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$927
(TAP AIR PORTUGAL)

One-way from

$665
(ITA Airways)

Popular in

February

Cheapest in

April
Provider with most accurate pricing for Washington, D.C. Dulles Intl-Trieste Ronchi dei Legionari flight deals.
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Provider most trusted by Cheapflights users for Washington, D.C. Dulles Intl-Trieste Ronchi dei Legionari flights.
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From Washington, D.C. Dulles Intl to Trieste Ronchi dei Legionari
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One-way flight from Washington, D.C. Dulles Intl to Trieste Ronchi dei Legionari
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Highest demand for flights based on searches. 37% potential increase in price ($630 potential increase over avg. RT price).
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Cheapest flight prices on average. 20% potential price decrease ($177 potential savings vs. average RT price).
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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 December 12, 2025.
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

Dulles Intl

Fly to

Trieste

Route

Depart

Return

Price

Washington, D.C.Trieste

IAD - TRS

IADTRS

Washington, D.C. Dulles Intl

Thu 1/29

5:30 pm-6:30 pm

2 stops19h 00m

Trieste Ronchi dei Legionari

Mon 2/2

3:15 pm-2:35 pm

2 stops29h 20m

$927

Washington, D.C.Trieste

IAD - TRS

IADTRS

Washington, D.C. Dulles Intl

Thu 1/29

9:15 pm-2:30 pm

2 stops59h 15m

Trieste Ronchi dei Legionari

Mon 2/2

6:35 am-11:45 am

2 stops35h 10m

$948

Washington, D.C.Trieste

IAD - TRS

IADTRS

Washington, D.C. Dulles Intl

Thu 1/29

12:40 pm-10:25 am

2 stops15h 45m

Trieste Ronchi dei Legionari

Mon 2/2

6:35 am-3:25 pm

1 stop14h 50m

$1,601

Washington, D.C.Trieste

IAD - TRS

IADTRS

Washington, D.C. Dulles Intl

Tue 12/30

1:30 pm-6:30 pm

2 stops47h 00m

Trieste Ronchi dei Legionari

Sat 1/3

11:15 am-11:45 am

2 stops54h 30m

$2,133

Washington, D.C.Trieste

IAD - TRS

IADTRS

Washington, D.C. Dulles Intl

Wed 2/11

5:25 pm-6:30 pm

2 stops19h 05m

Trieste Ronchi dei Legionari

Sun 2/22

3:15 pm-3:05 pm

2 stops53h 50m

$18,789

Washington, D.C.Trieste

IAD - TRS

IADTRS

Washington, D.C. Dulles Intl

Tue 5/5

4:30 pm-6:30 pm

1 stop20h 00m

$665

Washington, D.C.Trieste

IAD - TRS

IADTRS

Washington, D.C. Dulles Intl

Wed 5/6

12:43 pm-2:30 pm

2 stops19h 47m

$670

Washington, D.C.Trieste

IAD - TRS

IADTRS

Washington, D.C. Dulles Intl

Thu 5/7

12:43 pm-10:55 pm

2 stops28h 12m

$740

Washington, D.C.Trieste

IAD - TRS

IADTRS

Washington, D.C. Dulles Intl

Mon 5/4

12:43 pm-10:55 pm

2 stops28h 12m

$838

Washington, D.C.Trieste

IAD - TRS

IADTRS

Washington, D.C. Dulles Intl

Fri 5/8

12:43 pm-2:30 pm

2 stops19h 47m

$908

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/9

Showing 1-10 of 15 results
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, June is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Trieste (average of $446). Flying from Washington, D.C. Dulles Intl Airport to Trieste in December is currently the most expensive (average of $771). 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 December 12, 2025.
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
1,102 reviews

Food

6.0

Comfort

6.6

Crew

7.3

Boarding

6.9

Entertainment

6.2

Overall

6.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

FRA - FCO

It was a bit confusing where to check in Lufthansa. On the website it says Terminal 2. When we arrived at Frankfurt airport the arrow sign was pointing to 2 different directions. Turns out check in was in Terminal 1. Some Lufthansa ground crew at the counter were testy and rude. Doesn't give the customer an opportunity to talk. I would like to commend the female ground crew with long hair at the special services counter though. She was respectful, very pleasant and helpful. Unfortunately I didn’t get her name.
ITA Airways
6.7
Okay
1,102 reviews
ITA Airways
6.7
Okay
1,102 reviews

Food

6.0

Comfort

6.6

Crew

7.3

Boarding

6.9

Entertainment

6.2

Overall

6.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

FRA - FCO

It was a bit confusing where to check in Lufthansa. On the website it says Terminal 2. When we arrived at Frankfurt airport the arrow sign was pointing to 2 different directions. Turns out check in was in Terminal 1. Some Lufthansa ground crew at the counter were testy and rude. Doesn't give the customer an opportunity to talk. I would like to commend the female ground crew with long hair at the special services counter though. She was respectful, very pleasant and helpful. Unfortunately I didn’t get her name.

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 15h 45m. Fly via TAP AIR PORTUGAL, Turkish Airlines, or United Airlines to get the fastest option. The distance between Washington, D.C. Dulles Intl Airport and Trieste is about 4403 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • 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, June is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Trieste (average of $446). Flying from Washington, D.C. Dulles Intl Airport to Trieste in December is currently the most expensive (average of $771). 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.

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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 December 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
ITA AirwaysCheapest$664Average$910FlexibilityNo cancel feeOn-time81%

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