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Cheap flights from the United States to Trieste from $312

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from the United States to Trieste departing on 4/29. 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 the United States to Trieste

Recent round-trip flight deals from the United States to Trieste

Enter your travel dates to find the best prices.
KLM Logo
6:40 pm - 10:55 pm
BOS
-
TRS
23h 15m
1 stop
KLM Logo
3:15 pm - 2:30 pm
TRS
-
BOS
28h 15m
1 stop
$430KLM
Mon, Mar 9 - Mon, Mar 16
Multiple Airlines Logo
4:20 pm - 7:55 pm
LGA
-
TRS
21h 35m
2 stops
Multiple Airlines Logo
9:05 pm - 3:38 pm
TRS
-
LGA
24h 33m
2 stops
$436Multiple Airlines
Thu, Feb 26 - Sun, Mar 1
ITA Airways Logo
4:45 pm - 6:30 pm
JFK
-
TRS
19h 45m
1 stop
ITA Airways Logo
3:15 pm - 6:55 pm
TRS
-
JFK
33h 40m
1 stop
$490ITA Airways
Thu, Feb 26 - Sun, Mar 1
ITA Airways Logo
4:45 pm - 9:10 pm
JFK
-
TRS
22h 25m
2 stops
ITA Airways Logo
7:15 pm - 6:55 pm
TRS
-
JFK
29h 40m
1 stop
$500ITA Airways
Thu, Feb 26 - Sun, Mar 1
Lufthansa Logo
8:40 pm - 10:30 pm
BOS
-
TRS
19h 50m
2 stops
Lufthansa Logo
6:15 am - 1:10 pm
TRS
-
BOS
12h 55m
1 stop
$515Lufthansa
Thu, Feb 26 - Tue, Mar 3
Lufthansa Logo
8:40 pm - 10:30 pm
BOS
-
TRS
19h 50m
2 stops
Lufthansa Logo
6:15 am - 7:08 pm
TRS
-
BOS
18h 53m
2 stops
$524Lufthansa
Thu, Feb 26 - Tue, Mar 3
TAP AIR PORTUGAL Logo
12:55 am - 6:30 pm
EWR
-
TRS
36h 35m
2 stops
TAP AIR PORTUGAL Logo
6:35 am - 9:00 pm
TRS
-
EWR
20h 25m
2 stops
$664TAP AIR PORTUGAL
Mon, Mar 23 - Thu, Apr 9
TAP AIR PORTUGAL Logo
11:00 pm - 6:30 pm
EWR
-
TRS
37h 30m
2 stops
TAP AIR PORTUGAL Logo
3:15 pm - 3:30 pm
TRS
-
EWR
30h 15m
2 stops
$671TAP AIR PORTUGAL
Mon, Apr 20 - Mon, Apr 27
United Airlines Logo
6:05 pm - 10:25 am
STL
-
TRS
57h 20m
2 stops
United Airlines Logo
6:35 am - 9:47 pm
TRS
-
STL
22h 12m
2 stops
$893United Airlines
Sun, Apr 5 - Wed, Apr 15
United Airlines Logo
2:49 pm - 10:25 am
LGA
-
TRS
13h 36m
2 stops
United Airlines Logo
6:35 am - 4:58 pm
TRS
-
LGA
16h 23m
2 stops
$1,252United Airlines
Wed, Apr 29 - Mon, May 4

KLM flights from United States to Trieste

Our best KLM deals on United States to Trieste flight tickets
KLM
Mar 9
BOS6:40 pmBoston Logan Intl
23h 15m
1 stop
TRS10:55 pmTrieste Ronchi dei Legionari
Mar 16
TRS3:15 pmTrieste Ronchi dei Legionari
28h 15m
1 stop
BOS2:30 pmBoston Logan Intl
$430
KLM
Mar 18
MCO1:02 pmOrlando
20h 23m
2 stops
TRS2:25 pmTrieste Ronchi dei Legionari
Mar 25
TRS6:35 amTrieste Ronchi dei Legionari
21h 24m
2 stops
MCO10:59 pmOrlando
$689
KLM
Apr 5
STL12:28 pmLambert-St Louis
19h 02m
2 stops
TRS2:30 pmTrieste Ronchi dei Legionari
Apr 17
TRS6:35 amTrieste Ronchi dei Legionari
21h 44m
2 stops
STL9:19 pmLambert-St Louis
$694

United Airlines flights from United States to Trieste

Our best United Airlines deals on United States to Trieste flight tickets
United Airlines
Apr 5
STL6:05 pmLambert-St Louis
57h 20m
2 stops
TRS10:25 amTrieste Ronchi dei Legionari
Apr 15
TRS6:35 amTrieste Ronchi dei Legionari
22h 12m
2 stops
STL9:47 pmLambert-St Louis
$893
United Airlines
Apr 21
EWR5:05 pmNewark
11h 20m
1 stop
TRS10:25 amTrieste Ronchi dei Legionari
Apr 28
TRS6:35 amTrieste Ronchi dei Legionari
16h 15m
1 stop
EWR4:50 pmNewark
$895
United Airlines
Apr 20
EWR7:29 amNewark
20h 56m
2 stops
TRS10:25 amTrieste Ronchi dei Legionari
Apr 29
TRS6:35 amTrieste Ronchi dei Legionari
14h 05m
1 stop
EWR2:40 pmNewark
$899

momondo Fare Finder

 
Customize your flight search to find flights from United States 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 February 3, 2026.
Use the filters below to find and compare flights from the United States to Trieste that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

BostonTrieste

BOS - TRS

BOSTRS

Boston Logan Intl

Mon 3/9

6:40 pm-10:55 pm

1 stop23h 15m

Trieste Ronchi dei Legionari

Mon 3/16

3:15 pm-2:30 pm

1 stop28h 15m

$430

New YorkTrieste

LGA - TRS

LGATRS

New York LaGuardia

Thu 2/26

4:20 pm-7:55 pm

2 stops21h 35m

Trieste Ronchi dei Legionari

Sun 3/1

9:05 pm-3:38 pm

2 stops24h 33m

$436

New YorkTrieste

JFK - TRS

JFKTRS

New York John F Kennedy Intl

Thu 2/26

4:45 pm-6:30 pm

1 stop19h 45m

Trieste Ronchi dei Legionari

Sun 3/1

3:15 pm-6:55 pm

1 stop33h 40m

$490

New YorkTrieste

JFK - TRS

JFKTRS

New York John F Kennedy Intl

Thu 2/26

4:45 pm-9:10 pm

2 stops22h 25m

Trieste Ronchi dei Legionari

Sun 3/1

7:15 pm-6:55 pm

1 stop29h 40m

$500

BostonTrieste

BOS - TRS

BOSTRS

Boston Logan Intl

Thu 2/26

8:40 pm-10:30 pm

2 stops19h 50m

Trieste Ronchi dei Legionari

Tue 3/3

6:15 am-1:10 pm

1 stop12h 55m

$515

BostonTrieste

BOS - TRS

BOSTRS

Boston Logan Intl

Thu 2/26

8:40 pm-10:30 pm

2 stops19h 50m

Trieste Ronchi dei Legionari

Tue 3/3

6:15 am-7:08 pm

2 stops18h 53m

$524

NewarkTrieste

EWR - TRS

EWRTRS

Newark

Mon 3/23

12:55 am-6:30 pm

2 stops36h 35m

Trieste Ronchi dei Legionari

Thu 4/9

6:35 am-9:00 pm

2 stops20h 25m

$664

NewarkTrieste

EWR - TRS

EWRTRS

Newark

Mon 4/20

11:00 pm-6:30 pm

2 stops37h 30m

Trieste Ronchi dei Legionari

Mon 4/27

3:15 pm-3:30 pm

2 stops30h 15m

$671

St. LouisTrieste

STL - TRS

STLTRS

Lambert-St Louis

Sun 4/5

6:05 pm-10:25 am

2 stops57h 20m

Trieste Ronchi dei Legionari

Wed 4/15

6:35 am-9:47 pm

2 stops22h 12m

$893

New YorkTrieste

LGA - TRS

LGATRS

New York LaGuardia

Wed 4/29

2:49 pm-10:25 am

2 stops13h 36m

Trieste Ronchi dei Legionari

Mon 5/4

6:35 am-4:58 pm

2 stops16h 23m

$1,252

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Trieste from

How to get the cheapest flight ticket from United States 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 month to fly to Trieste?

The cheapest month to fly to Trieste from United States is in February. Flight prices, which tend to average around $576, are often lower during this time because this is during the off-season. If you don’t want to visit Trieste in February, then you should wait until November to fly from United States, when ticket prices are also cheap, with an average price of $587.

Can stopping save me money on United States to Trieste flights?

You could potentially save up to 27% on your flight if you consider stops on a United States to Trieste flight.

Cheap United States to Trieste flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from United States to Trieste

Fastest flight time

11h 10m

Direct flights

None
The fastest flight from United States to Trieste takes 11h 10m
There are no direct flights from United States to Trieste. There are no popular flight routes from United States to Trieste.
Search flight deals

  • When did momondo last update prices for flights from United States to Trieste Ronchi dei Legionari Airport?

    Prices for flights from United States to Trieste Ronchi dei Legionari Airport refresh daily.

  • How many operators does momondo search for flights from United States to Trieste Ronchi dei Legionari Airport?

  • How old do you have to be to fly from United States to Trieste Ronchi dei Legionari Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from United States 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.

Best airlines flying from United States to Trieste

Compare and see reviews for airlines that fly from United States to Trieste with momondo
Airline
Rating
Free Cancellation
Price
ITA AirwaysPriceFrom $427Free CancellationRating
6.7
1,144 reviews
Search ITA Airways flights
LufthansaPriceFrom $513Free CancellationRating
6.8
7,759 reviews
Search Lufthansa flights

Traveling to a place near Trieste?

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

Why use momondo?

Why should I use momondo to find a flight deal from United States to Trieste?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Trieste from United States.

Can I find flights from United States to Trieste with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Trieste from United States with this policy.

How can momondo help me find flights from United States to Trieste?

momondo provides multiple filters to help you find the best flight to Trieste from United States. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from United States to Trieste right now. Can momondo alert me if prices change?

Yes. momondo can track prices for United States to Trieste flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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