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Cheap flights from Seattle to Trieste from $1,058

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Trieste departing on 10/1. 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
1 adult, Economy, 0 bags

Find the cheapest flights from Seattle to Trieste

Cheap round-trip flights

Enter your travel dates to find the best prices.
Lufthansa Logo
2:10 pm - 1:55 pmSEA  Seattle/Tacoma Intl-TRS Trieste Ronchi dei Legionari
14h 45m1 stop Frankfurt am Main
Lufthansa Logo
6:15 am - 10:42 pmTRS  Trieste Ronchi dei Legionari-SEA Seattle/Tacoma Intl
25h 27m2 stops Frankfurt am Main Vancouver Intl
$1,058Lufthansa
Thu, Oct 1 - Thu, Oct 8
Lufthansa Logo
2:10 pm - 1:55 pmSEA  Seattle/Tacoma Intl-TRS Trieste Ronchi dei Legionari
14h 45m1 stop Frankfurt am Main
Lufthansa Logo
6:15 am - 12:20 pmTRS  Trieste Ronchi dei Legionari-SEA Seattle/Tacoma Intl
15h 05m1 stop Frankfurt am Main
$1,061Lufthansa
Thu, Oct 1 - Thu, Oct 8
Lufthansa Logo
1:56 pm - 10:15 pmSEA  Seattle/Tacoma Intl-TRS Trieste Ronchi dei Legionari
23h 19m2 stops Chicago O'Hare Intl Frankfurt am Main
Lufthansa Logo
6:15 am - 10:42 pmTRS  Trieste Ronchi dei Legionari-SEA Seattle/Tacoma Intl
25h 27m2 stops Frankfurt am Main Vancouver Intl
$1,064Lufthansa
Thu, Oct 1 - Thu, Oct 8
Lufthansa Logo
2:10 pm - 10:15 pmSEA  Seattle/Tacoma Intl-TRS Trieste Ronchi dei Legionari
23h 05m1 stop Frankfurt am Main
Lufthansa Logo
6:10 am - 12:20 pmTRS  Trieste Ronchi dei Legionari-SEA Seattle/Tacoma Intl
15h 10m1 stop Frankfurt am Main
$1,067Lufthansa
Sun, Sep 27 - Sun, Oct 4
Lufthansa Logo
7:00 am - 1:45 pmSEA  Seattle/Tacoma Intl-TRS Trieste Ronchi dei Legionari
21h 45m2 stops Chicago O'Hare Intl Frankfurt am Main
Lufthansa Logo
6:10 am - 12:20 pmTRS  Trieste Ronchi dei Legionari-SEA Seattle/Tacoma Intl
15h 10m1 stop Frankfurt am Main
$1,071Lufthansa
Sun, Sep 27 - Sun, Oct 4
Lufthansa Logo
7:00 am - 1:45 pmSEA  Seattle/Tacoma Intl-TRS Trieste Ronchi dei Legionari
21h 45m2 stops Chicago O'Hare Intl Frankfurt am Main
Lufthansa Logo
6:10 am - 8:37 pmTRS  Trieste Ronchi dei Legionari-SEA Seattle/Tacoma Intl
23h 27m2 stops Frankfurt am Main Washington, D.C. Dulles Intl
$1,106Lufthansa
Sun, Sep 27 - Sun, Oct 4
Multiple Airlines Logo
3:40 pm - 10:25 amSEA  Seattle/Tacoma Intl-TRS Trieste Ronchi dei Legionari
33h 45m3 stops Reykjavik Keflavik Intl Stockholm Arlanda Rome Fiumicino
Multiple Airlines Logo
9:30 am - 9:40 amTRS  Trieste Ronchi dei Legionari-SEA Seattle/Tacoma Intl
33h 10m2 stops Dublin Calgary
$1,149Multiple Airlines
Sun, Sep 27 - Sun, Oct 4
United Airlines Logo
6:50 am - 10:25 amSEA  Seattle/Tacoma Intl-TRS Trieste Ronchi dei Legionari
18h 35m2 stops Newark Rome Fiumicino
United Airlines Logo
6:35 am - 8:59 pmTRS  Trieste Ronchi dei Legionari-SEA Seattle/Tacoma Intl
23h 24m2 stops Rome Fiumicino Toronto Pearson Intl
$1,174United Airlines
Sun, Jan 10 - Thu, Jan 14
Multiple Airlines Logo
6:50 pm - 2:30 pmSEA  Seattle/Tacoma Intl-TRS Trieste Ronchi dei Legionari
34h 40m3 stops Munich Franz Josef Strauss Palermo Punta Raisi Rome Fiumicino
Multiple Airlines Logo
11:30 am - 12:20 pmTRS  Trieste Ronchi dei Legionari-SEA Seattle/Tacoma Intl
33h 50m3 stops Palermo Punta Raisi Munich Franz Josef Strauss Frankfurt am Main
$1,182Multiple Airlines
Sun, Sep 27 - Sun, Oct 4
Multiple Airlines Logo
7:00 pm - 2:30 pmSEA  Seattle/Tacoma Intl-TRS Trieste Ronchi dei Legionari
34h 30m3 stops Reykjavik Keflavik Intl Amsterdam Schiphol Rome Fiumicino
Multiple Airlines Logo
6:15 am - 8:40 pmTRS  Trieste Ronchi dei Legionari-SEA Seattle/Tacoma Intl
23h 25m3 stops Frankfurt am Main Stockholm Arlanda Reykjavik Keflavik Intl
$1,212Multiple Airlines
Thu, Oct 1 - Thu, Oct 8

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United Airlines flights from Seattle to Trieste

Our best United Airlines deals on Seattle to Trieste flight tickets
United Airlines
Jan 10
SEA10:45 pmSeattle/Tacoma Intl
26h 40m
2 stops
TRS10:25 amTrieste Ronchi dei Legionari
Jan 14
TRS6:35 amTrieste Ronchi dei Legionari
39h 10m
3 stops
SEA12:45 pmSeattle/Tacoma Intl
$1,174
United Airlines
Jan 10
SEA10:45 pmSeattle/Tacoma Intl
26h 40m
2 stops
TRS10:25 amTrieste Ronchi dei Legionari
Jan 14
TRS6:35 amTrieste Ronchi dei Legionari
39h 10m
3 stops
SEA12:45 pmSeattle/Tacoma Intl
$1,292
United Airlines
Jan 10
SEA10:45 pmSeattle/Tacoma Intl
26h 40m
2 stops
TRS10:25 amTrieste Ronchi dei Legionari
Jan 14
TRS6:35 amTrieste Ronchi dei Legionari
39h 10m
3 stops
SEA12:45 pmSeattle/Tacoma Intl
$1,313

Lufthansa flights from Seattle to Trieste

Our best Lufthansa deals on Seattle to Trieste flight tickets
Lufthansa
Oct 1
SEA2:10 pmSeattle/Tacoma Intl
14h 45m
1 stop
TRS1:55 pmTrieste Ronchi dei Legionari
Oct 8
TRS6:15 amTrieste Ronchi dei Legionari
25h 27m
2 stops
SEA10:42 pmSeattle/Tacoma Intl
$1,058
Lufthansa
Oct 1
SEA2:10 pmSeattle/Tacoma Intl
14h 45m
1 stop
TRS1:55 pmTrieste Ronchi dei Legionari
Oct 8
TRS6:15 amTrieste Ronchi dei Legionari
15h 05m
1 stop
SEA12:20 pmSeattle/Tacoma Intl
$1,061
Lufthansa
Oct 1
SEA1:56 pmSeattle/Tacoma Intl
23h 19m
2 stops
TRS10:15 pmTrieste Ronchi dei Legionari
Oct 8
TRS6:15 amTrieste Ronchi dei Legionari
25h 27m
2 stops
SEA10:42 pmSeattle/Tacoma Intl
$1,064

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 August 18, 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

Cheapest round-trip

SeattleTrieste

SEA Seattle/Tacoma Intl - TRS Trieste Ronchi dei Legionari

SEATRS

Seattle/Tacoma Intl

Thu 10/1

2:10 pm-1:55 pm

1 stop14h 45m

Trieste Ronchi dei Legionari

Thu 10/8

6:15 am-10:42 pm

2 stops25h 27m

$1,058
Quickest round-trip

SeattleTrieste

SEA Seattle/Tacoma Intl - TRS Trieste Ronchi dei Legionari

SEATRS

Seattle/Tacoma Intl

Thu 10/1

2:10 pm-1:55 pm

1 stop14h 45m

Trieste Ronchi dei Legionari

Thu 10/8

6:15 am-12:20 pm

1 stop15h 05m

$1,061

SeattleTrieste

SEA Seattle/Tacoma Intl - TRS Trieste Ronchi dei Legionari

SEATRS

Seattle/Tacoma Intl

Thu 10/1

1:56 pm-10:15 pm

2 stops23h 19m

Trieste Ronchi dei Legionari

Thu 10/8

6:15 am-10:42 pm

2 stops25h 27m

$1,064

SeattleTrieste

SEA Seattle/Tacoma Intl - TRS Trieste Ronchi dei Legionari

SEATRS

Seattle/Tacoma Intl

Sun 9/27

2:10 pm-10:15 pm

1 stop23h 05m

Trieste Ronchi dei Legionari

Sun 10/4

6:10 am-12:20 pm

1 stop15h 10m

$1,067

SeattleTrieste

SEA Seattle/Tacoma Intl - TRS Trieste Ronchi dei Legionari

SEATRS

Seattle/Tacoma Intl

Sun 9/27

7:00 am-1:45 pm

2 stops21h 45m

Trieste Ronchi dei Legionari

Sun 10/4

6:10 am-12:20 pm

1 stop15h 10m

$1,071

SeattleTrieste

SEA Seattle/Tacoma Intl - TRS Trieste Ronchi dei Legionari

SEATRS

Seattle/Tacoma Intl

Sun 9/27

7:00 am-1:45 pm

2 stops21h 45m

Trieste Ronchi dei Legionari

Sun 10/4

6:10 am-8:37 pm

2 stops23h 27m

$1,106

SeattleTrieste

SEA Seattle/Tacoma Intl - TRS Trieste Ronchi dei Legionari

SEATRS

Seattle/Tacoma Intl

Sun 9/27

3:40 pm-10:25 am

3 stops33h 45m

Trieste Ronchi dei Legionari

Sun 10/4

9:30 am-9:40 am

2 stops33h 10m

$1,149

SeattleTrieste

SEA Seattle/Tacoma Intl - TRS Trieste Ronchi dei Legionari

SEATRS

Seattle/Tacoma Intl

Sun 1/10

6:50 am-10:25 am

2 stops18h 35m

Trieste Ronchi dei Legionari

Thu 1/14

6:35 am-8:59 pm

2 stops23h 24m

$1,174

SeattleTrieste

SEA Seattle/Tacoma Intl - TRS Trieste Ronchi dei Legionari

SEATRS

Seattle/Tacoma Intl

Sun 9/27

6:50 pm-2:30 pm

3 stops34h 40m

Trieste Ronchi dei Legionari

Sun 10/4

11:30 am-12:20 pm

3 stops33h 50m

$1,182

SeattleTrieste

SEA Seattle/Tacoma Intl - TRS Trieste Ronchi dei Legionari

SEATRS

Seattle/Tacoma Intl

Thu 10/1

7:00 pm-2:30 pm

3 stops34h 30m

Trieste Ronchi dei Legionari

Thu 10/8

6:15 am-8:40 pm

3 stops23h 25m

$1,212

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 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?

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

What airlines fly to Trieste?

Condor, British Airways and Delta are the top three most popular airlines that fly to Trieste from Seattle according to our data. Condor is the first choice among our users, with 51% of people opting to fly with this airline when traveling to Trieste. Keep in mind that there are 7 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

Best Price Found

$2,462

Fastest flight time

14h 45m

Direct flights

None
The best one-way flight to Trieste from Seattle in the past 72 hours is $2,462. The best round-trip flight deal from Seattle to Trieste found on momondo in the last 72 hours is $1,058.
The fastest flight from Seattle to Trieste takes 14h 45m
There are no direct flights from Seattle to Trieste. There are no popular flight routes from Seattle to Trieste.
Search flight deals

Frequently asked questions about flying from Seattle to Trieste

  • 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. 14h 45m 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
Grado
Udine

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

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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
Condor
British Airways
Delta
Lufthansa
United Airlines
Turkish Airlines
Air France