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Cheap flights from Seattle to Trieste from $296

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Trieste departing on 5/12. 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 Seattle to Trieste

Cheap round-trip flights

Enter your travel dates to find the best prices.
Lufthansa Logo
3:00 pm - 2:00 pm
SEA
-
TRS
15h 00m
1 stop
Lufthansa Logo
6:10 am - 8:53 pm
TRS
-
SEA
23h 43m
2 stops
$653Lufthansa
Tue, Mar 24 - Tue, Mar 31
Multiple Airlines Logo
8:00 am - 2:00 pm
SEA
-
TRS
22h 00m
2 stops
Multiple Airlines Logo
6:10 am - 8:53 pm
TRS
-
SEA
23h 43m
2 stops
$656Multiple Airlines
Tue, Mar 24 - Tue, Mar 31
Lufthansa Logo
3:00 pm - 2:00 pm
SEA
-
TRS
15h 00m
1 stop
Lufthansa Logo
2:45 pm - 12:20 pm
TRS
-
SEA
30h 35m
1 stop
$663Lufthansa
Tue, Mar 24 - Tue, Mar 31
Multiple Airlines Logo
8:00 am - 2:00 pm
SEA
-
TRS
22h 00m
2 stops
Multiple Airlines Logo
2:45 pm - 12:20 pm
TRS
-
SEA
30h 35m
1 stop
$666Multiple Airlines
Tue, Mar 24 - Tue, Mar 31
Lufthansa Logo
6:50 pm - 10:15 pm
SEA
-
TRS
18h 25m
2 stops
Lufthansa Logo
2:50 pm - 11:55 am
TRS
-
SEA
30h 05m
1 stop
$714Lufthansa
Sun, Aug 9 - Mon, Aug 24
Multiple Airlines Logo
3:35 pm - 9:10 pm
SEA
-
TRS
21h 35m
3 stops
Multiple Airlines Logo
6:35 am - 8:40 pm
TRS
-
SEA
23h 05m
3 stops
$731Multiple Airlines
Tue, Mar 24 - Tue, Mar 31
Lufthansa Logo
6:50 pm - 10:15 pm
SEA
-
TRS
18h 25m
2 stops
Lufthansa Logo
2:50 pm - 10:29 pm
TRS
-
SEA
40h 39m
2 stops
$754Lufthansa
Sun, Aug 9 - Mon, Aug 24
Lufthansa Logo
2:10 pm - 1:45 pm
SEA
-
TRS
14h 35m
1 stop
Lufthansa Logo
6:10 am - 12:20 pm
TRS
-
SEA
15h 10m
1 stop
$787Lufthansa
Tue, Mar 31 - Wed, Apr 8
Lufthansa Logo
7:00 am - 1:45 pm
SEA
-
TRS
21h 45m
2 stops
Lufthansa Logo
6:10 am - 12:20 pm
TRS
-
SEA
15h 10m
1 stop
$791Lufthansa
Tue, Mar 31 - Wed, Apr 8
Multiple Airlines Logo
9:55 am - 10:25 pm
SEA
-
TRS
27h 30m
2 stops
Multiple Airlines Logo
6:00 am - 10:20 am
TRS
-
SEA
37h 20m
2 stops
$798Multiple Airlines
Wed, May 6 - Thu, May 14

United Airlines flights from Seattle to Trieste

Our best United Airlines deals on Seattle to Trieste flight tickets
United Airlines
Jun 21
SEA11:30 amSeattle/Tacoma Intl
37h 55m
2 stops
TRS10:25 amTrieste Ronchi dei Legionari
Jul 5
TRS6:35 amTrieste Ronchi dei Legionari
36h 57m
2 stops
SEA10:32 amSeattle/Tacoma Intl
$1,789
United Airlines
Mar 4
SEA7:00 amSeattle/Tacoma Intl
18h 25m
2 stops
TRS10:25 amTrieste Ronchi dei Legionari
Mar 8
TRS6:35 amTrieste Ronchi dei Legionari
46h 23m
3 stops
SEA7:58 pmSeattle/Tacoma Intl
$2,098
United Airlines
Mar 4
SEA12:32 pmSeattle/Tacoma Intl
36h 53m
3 stops
TRS10:25 amTrieste Ronchi dei Legionari
Mar 8
TRS6:35 amTrieste Ronchi dei Legionari
46h 23m
3 stops
SEA7:58 pmSeattle/Tacoma Intl
$2,177

Lufthansa flights from Seattle to Trieste

Our best Lufthansa deals on Seattle to Trieste flight tickets
Lufthansa
Mar 24
SEA3:00 pmSeattle/Tacoma Intl
15h 00m
1 stop
TRS2:00 pmTrieste Ronchi dei Legionari
Mar 31
TRS6:10 amTrieste Ronchi dei Legionari
23h 43m
2 stops
SEA8:53 pmSeattle/Tacoma Intl
$653
Lufthansa
Mar 24
SEA3:00 pmSeattle/Tacoma Intl
15h 00m
1 stop
TRS2:00 pmTrieste Ronchi dei Legionari
Mar 31
TRS2:45 pmTrieste Ronchi dei Legionari
30h 35m
1 stop
SEA12:20 pmSeattle/Tacoma Intl
$663
Lufthansa
Mar 31
SEA2:10 pmSeattle/Tacoma Intl
14h 35m
1 stop
TRS1:45 pmTrieste Ronchi dei Legionari
Apr 8
TRS6:10 amTrieste Ronchi dei Legionari
15h 10m
1 stop
SEA12:20 pmSeattle/Tacoma Intl
$787

momondo Fare Finder

 
Customize your flight search to find flights from Seattle 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 10, 2026.
Use the filters below to find and compare flights from Seattle to Trieste that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Tue 3/24

3:00 pm-2:00 pm

1 stop15h 00m

Trieste Ronchi dei Legionari

Tue 3/31

6:10 am-8:53 pm

2 stops23h 43m

$653

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Tue 3/24

8:00 am-2:00 pm

2 stops22h 00m

Trieste Ronchi dei Legionari

Tue 3/31

6:10 am-8:53 pm

2 stops23h 43m

$656

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Tue 3/24

3:00 pm-2:00 pm

1 stop15h 00m

Trieste Ronchi dei Legionari

Tue 3/31

2:45 pm-12:20 pm

1 stop30h 35m

$663

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Tue 3/24

8:00 am-2:00 pm

2 stops22h 00m

Trieste Ronchi dei Legionari

Tue 3/31

2:45 pm-12:20 pm

1 stop30h 35m

$666

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Sun 8/9

6:50 pm-10:15 pm

2 stops18h 25m

Trieste Ronchi dei Legionari

Mon 8/24

2:50 pm-11:55 am

1 stop30h 05m

$714

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Tue 3/24

3:35 pm-9:10 pm

3 stops21h 35m

Trieste Ronchi dei Legionari

Tue 3/31

6:35 am-8:40 pm

3 stops23h 05m

$731

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Sun 8/9

6:50 pm-10:15 pm

2 stops18h 25m

Trieste Ronchi dei Legionari

Mon 8/24

2:50 pm-10:29 pm

2 stops40h 39m

$754

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Tue 3/31

2:10 pm-1:45 pm

1 stop14h 35m

Trieste Ronchi dei Legionari

Wed 4/8

6:10 am-12:20 pm

1 stop15h 10m

$787

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Tue 3/31

7:00 am-1:45 pm

2 stops21h 45m

Trieste Ronchi dei Legionari

Wed 4/8

6:10 am-12:20 pm

1 stop15h 10m

$791

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Wed 5/6

9:55 am-10:25 pm

2 stops27h 30m

Trieste Ronchi dei Legionari

Thu 5/14

6:00 am-10:20 am

2 stops37h 20m

$798

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 resultsSorted by cheapest first
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See travel insights to Trieste from

How to get the cheapest flight ticket from Seattle 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 airline that flies from Seattle/Tacoma Intl to Trieste Ronchi dei Legionari?

United Airlines is the most popular carrier operating from Seattle/Tacoma Intl to Trieste Ronchi dei Legionari

What airlines fly to Trieste?

Delta, British Airways and Lufthansa are the top three most popular airlines that fly to Trieste from Seattle according to our data. Delta is the first choice among our users, with 33% of people opting to fly with this airline when traveling to Trieste. Keep in mind that there are 11 different airlines that fly to Trieste on a routine basis, so you have a few additional options to choose from.

When to book flights from Seattle to Trieste

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

Cheap Seattle to Trieste (SEA to TRS) flight deals and tips

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

Fastest flight time

18h 25m

Direct flights

None
The fastest flight from Seattle to Trieste takes 18h 25m
There are no direct flights from Seattle to Trieste. There are no popular flight routes from Seattle to Trieste.
Search flight deals

  • How far is Seattle/Tacoma Intl to Trieste Ronchi dei Legionari by plane?

    A flight from Seattle/Tacoma Intl to Trieste Ronchi dei Legionari will travel around 5463.5 mi. 18h 25m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Trieste Ronchi dei Legionari Airport?

    Prices for flights from Seattle/Tacoma Intl Airport to Trieste Ronchi dei Legionari Airport were last updated today.

  • How old do you have to be to fly from Seattle/Tacoma Intl Airport to Trieste Ronchi dei Legionari Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Trieste Ronchi dei Legionari Airport.

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

    The required travel and health documents for your Trieste Ronchi dei Legionari Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Trieste Ronchi dei Legionari Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

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 Seattle to Trieste?

It is quick and easy to find Seattle to Trieste flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Trieste that suits you.

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

Flights from Seattle to Trieste with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Seattle to Trieste?

Once all potential Seattle to Trieste flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Seattle 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 Seattle and alert you when they change.

An easier way to manage your Trieste trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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Fly your favorite airline to Trieste

Airlines are sorted and displayed according to clicks in the past 7 days on momondo
Delta
British Airways
Lufthansa
Turkish Airlines
Condor
Air France
United Airlines
American Airlines
KLM
Scandinavian Airlines
Finnair