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Cheap flights from Washington, D.C. to Trieste from $665

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. to Trieste departing on 3/22. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Washington, D.C. to Trieste

Cheap round-trip flights

Enter your travel dates to find the best prices.
ITA Airways Logo
5:45 pm - 10:25 am
IAD
-
TRS
11h 40m1 stop
ITA Airways Logo
6:35 am - 2:40 pm
TRS
-
IAD
14h 05m1 stop
$665ITA Airways
Sun, Mar 22 - Tue, Mar 31
ITA Airways Logo
5:45 pm - 9:10 pm
IAD
-
TRS
22h 25m2 stops
ITA Airways Logo
6:35 am - 2:40 pm
TRS
-
IAD
14h 05m1 stop
$710ITA Airways
Sun, Mar 22 - Tue, Mar 31
Multiple Airlines Logo
10:30 pm - 10:45 pm
IAD
-
TRS
18h 15m2 stops
Multiple Airlines Logo
7:15 pm - 3:15 pm
TRS
-
IAD
26h 00m3 stops
$724Multiple Airlines
Fri, Jan 30 - Fri, Feb 6
ITA Airways Logo
4:30 pm - 10:25 am
IAD
-
TRS
11h 55m1 stop
ITA Airways Logo
6:35 am - 2:40 pm
TRS
-
IAD
14h 05m1 stop
$729ITA Airways
Sun, Apr 12 - Tue, May 5
Multiple Airlines Logo
6:00 am - 10:25 am
DCA
-
TRS
22h 25m2 stops
Multiple Airlines Logo
6:35 am - 10:47 pm
TRS
-
DCA
22h 12m2 stops
$749Multiple Airlines
Fri, Jan 30 - Fri, Feb 6
Multiple Airlines Logo
8:40 pm - 12:20 pm
IAD
-
TRS
34h 40m3 stops
Multiple Airlines Logo
6:35 am - 7:20 pm
TRS
-
IAD
18h 45m3 stops
$767Multiple Airlines
Sun, Mar 22 - Tue, Mar 31
Multiple Airlines Logo
7:40 pm - 10:55 pm
BWI
-
TRS
21h 15m3 stops
Multiple Airlines Logo
6:35 am - 6:40 pm
TRS
-
BWI
18h 05m3 stops
$781Multiple Airlines
Fri, Jan 30 - Fri, Feb 6
United Airlines Logo
8:40 pm - 10:25 am
DCA
-
TRS
55h 45m2 stops
United Airlines Logo
6:35 am - 10:19 am
TRS
-
DCA
33h 44m2 stops
$1,867United Airlines
Fri, Jun 5 - Sat, Jun 13
United Airlines Logo
12:59 pm - 10:25 am
DCA
-
TRS
15h 26m2 stops
United Airlines Logo
6:35 am - 10:35 pm
TRS
-
DCA
22h 00m2 stops
$1,908United Airlines
Wed, Jan 28 - Sun, Feb 1
United Airlines Logo
3:44 pm - 10:25 am
BWI
-
TRS
36h 41m2 stops
United Airlines Logo
6:35 am - 1:57 pm
TRS
-
BWI
37h 22m2 stops
$3,344United Airlines
Sun, Apr 12 - Tue, May 5

ITA Airways flights from Washington, D.C. to Trieste

Our best ITA Airways deals on Washington, D.C. to Trieste flight tickets
ITA Airways
Mar 22
IAD5:45 pmWashington, D.C. Dulles Intl
11h 40m
1 stop
TRS10:25 amTrieste Ronchi dei Legionari
Mar 31
TRS6:35 amTrieste Ronchi dei Legionari
14h 05m
1 stop
IAD2:40 pmWashington, D.C. Dulles Intl
$665
Find similar
ITA Airways
Mar 22
IAD5:45 pmWashington, D.C. Dulles Intl
22h 25m
2 stops
TRS9:10 pmTrieste Ronchi dei Legionari
Mar 31
TRS6:35 amTrieste Ronchi dei Legionari
14h 05m
1 stop
IAD2:40 pmWashington, D.C. Dulles Intl
$710
Find similar
ITA Airways
Apr 12
IAD4:30 pmWashington, D.C. Dulles Intl
11h 55m
1 stop
TRS10:25 amTrieste Ronchi dei Legionari
May 5
TRS6:35 amTrieste Ronchi dei Legionari
14h 05m
1 stop
IAD2:40 pmWashington, D.C. Dulles Intl
$729
Find similar

United Airlines flights from Washington, D.C. to Trieste

Our best United Airlines deals on Washington, D.C. to Trieste flight tickets
United Airlines
Jan 29
IAD12:40 pmWashington, D.C. Dulles Intl
15h 45m
2 stops
TRS10:25 amTrieste Ronchi dei Legionari
Feb 2
TRS6:35 amTrieste Ronchi dei Legionari
14h 50m
1 stop
IAD3:25 pmWashington, D.C. Dulles Intl
$1,801
Find similar
United Airlines
Jan 29
IAD12:40 pmWashington, D.C. Dulles Intl
15h 45m
2 stops
TRS10:25 amTrieste Ronchi dei Legionari
Feb 2
TRS6:35 amTrieste Ronchi dei Legionari
14h 50m
1 stop
IAD3:25 pmWashington, D.C. Dulles Intl
$1,802
Find similar
United Airlines
Jan 28
DCA12:59 pmWashington, D.C. Reagan-National
15h 26m
2 stops
TRS10:25 amTrieste Ronchi dei Legionari
Feb 1
TRS6:35 amTrieste Ronchi dei Legionari
19h 24m
2 stops
DCA7:59 pmWashington, D.C. Reagan-National
$1,908
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. 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, momondo users made 832,500 searches. Data last updated December 17, 2025.
Use the filters below to find and compare flights from Washington, D.C. to Trieste that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Trieste

IAD - TRS

IADTRS

Washington, D.C. Dulles Intl

Sun 3/22

5:45 pm-10:25 am

1 stop11h 40m

Trieste Ronchi dei Legionari

Tue 3/31

6:35 am-2:40 pm

1 stop14h 05m

$665

Washington, D.C.Trieste

IAD - TRS

IADTRS

Washington, D.C. Dulles Intl

Sun 3/22

5:45 pm-9:10 pm

2 stops22h 25m

Trieste Ronchi dei Legionari

Tue 3/31

6:35 am-2:40 pm

1 stop14h 05m

$710

Washington, D.C.Trieste

IAD - TRS

IADTRS

Washington, D.C. Dulles Intl

Fri 1/30

10:30 pm-10:45 pm

2 stops18h 15m

Trieste Ronchi dei Legionari

Fri 2/6

7:15 pm-3:15 pm

3 stops26h 00m

$724

Washington, D.C.Trieste

IAD - TRS

IADTRS

Washington, D.C. Dulles Intl

Sun 4/12

4:30 pm-10:25 am

1 stop11h 55m

Trieste Ronchi dei Legionari

Tue 5/5

6:35 am-2:40 pm

1 stop14h 05m

$729

Washington, D.C.Trieste

DCA - TRS

DCATRS

Washington, D.C. Reagan-National

Fri 1/30

6:00 am-10:25 am

2 stops22h 25m

Trieste Ronchi dei Legionari

Fri 2/6

6:35 am-10:47 pm

2 stops22h 12m

$749

Washington, D.C.Trieste

IAD - TRS

IADTRS

Washington, D.C. Dulles Intl

Sun 3/22

8:40 pm-12:20 pm

3 stops34h 40m

Trieste Ronchi dei Legionari

Tue 3/31

6:35 am-7:20 pm

3 stops18h 45m

$767

BaltimoreTrieste

BWI - TRS

BWITRS

Baltimore/Washington

Fri 1/30

7:40 pm-10:55 pm

3 stops21h 15m

Trieste Ronchi dei Legionari

Fri 2/6

6:35 am-6:40 pm

3 stops18h 05m

$781

Washington, D.C.Trieste

DCA - TRS

DCATRS

Washington, D.C. Reagan-National

Fri 6/5

8:40 pm-10:25 am

2 stops55h 45m

Trieste Ronchi dei Legionari

Sat 6/13

6:35 am-10:19 am

2 stops33h 44m

$1,867

Washington, D.C.Trieste

DCA - TRS

DCATRS

Washington, D.C. Reagan-National

Wed 1/28

12:59 pm-10:25 am

2 stops15h 26m

Trieste Ronchi dei Legionari

Sun 2/1

6:35 am-10:35 pm

2 stops22h 00m

$1,908

BaltimoreTrieste

BWI - TRS

BWITRS

Baltimore/Washington

Sun 4/12

3:44 pm-10:25 am

2 stops36h 41m

Trieste Ronchi dei Legionari

Tue 5/5

6:35 am-1:57 pm

2 stops37h 22m

$3,344

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 resultsSorted by cheapest first
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How to get the cheapest flight ticket from Washington, D.C. to Trieste

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Trieste?

The cheapest day to depart on your flight to Trieste is on a Tuesday when prices can be found for as low as $866. This is often the case because there is less demand to fly during this day of the week. Flights from Washington, D.C. to Trieste on a Friday will generally be more expensive and average around $988. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

When to book flights from Washington, D.C. to Trieste

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. to Trieste according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Washington, D.C. to Trieste (WAS to TRS) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. to Trieste

Fastest flight time

14h 45m

Direct flights

None
The fastest flight from Washington, D.C. to Trieste takes 14h 45m
There are no direct flights from Washington, D.C. to Trieste. There are no popular flight routes from Washington, D.C. to Trieste.
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  • How far is Washington, D.C. to Trieste Ronchi dei Legionari by plane?

    A flight from Washington, D.C. to Trieste Ronchi dei Legionari will travel around 4405.3 mi. Flights usually cover this in 14h 45m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Washington, D.C. to Trieste Ronchi dei Legionari Airport?

    Prices for flights from Washington, D.C. to Trieste Ronchi dei Legionari Airport are updated daily.

  • How many operators does momondo search for flights from Washington, D.C. to Trieste Ronchi dei Legionari Airport?

  • How old do you have to be to fly from Washington, D.C. to Trieste Ronchi dei Legionari Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington, D.C. to Trieste Ronchi dei Legionari Airport.

  • What documentation or ID do you need to fly to Trieste Ronchi dei Legionari Airport?

    The travel and health documents you'll need for your trip to Trieste Ronchi dei Legionari Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Trieste Ronchi dei Legionari Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Washington, D.C. to Trieste?

Best airlines flying from Washington, D.C. to Trieste

Compare and see reviews for airlines that fly from Washington, D.C. to Trieste with momondo
Airline
Rating
Free Cancellation
Price
ITA AirwaysPriceFrom $664Free CancellationRating
6.7
1,107 reviews
Search ITA Airways flights

Traveling to a place near Trieste?

Book flights to Trieste if you plan to visit one of these locations
Udine
Grado

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Why should I use momondo to find a flight deal from Washington, D.C. to Trieste?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Washington, D.C. to Trieste. momondo saves you time and could save you money on your trip.

Can I find flights from Washington, D.C. to Trieste with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Washington, D.C. to Trieste flights to just show those with flexible booking policies.

How can momondo help me find flights from Washington, D.C. to Trieste?

Once you have performed a search for Washington, D.C. to Trieste flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Washington, D.C. to Trieste right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Trieste, momondo offers a useful price alert feature which will track prices for flights to Trieste from Washington, D.C. and alert you when they change.

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Airlines are sorted and displayed according to clicks in the past 7 days on momondo
United Airlines
Turkish Airlines
British Airways
ITA Airways
Delta
Lufthansa
TAP AIR PORTUGAL
Scandinavian Airlines
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American Airlines