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Cheap flights from Seattle to Trieste from $538

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 7/31. 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.
Multiple Airlines Logo
5:30 pm - 10:55 pm
SEA
-
TRS
20h 25m
1 stop
Multiple Airlines Logo
6:35 am - 5:50 pm
TRS
-
SEA
20h 15m
1 stop
$984Multiple Airlines
Thu, Aug 13 - Thu, Aug 20
Lufthansa Logo
10:40 am - 1:55 pm
SEA
-
TRS
18h 15m
2 stops
Lufthansa Logo
6:15 am - 6:32 pm
TRS
-
SEA
21h 17m
2 stops
$992Lufthansa
Thu, Aug 13 - Thu, Aug 20
Lufthansa Logo
2:10 pm - 1:55 pm
SEA
-
TRS
14h 45m
1 stop
Lufthansa Logo
6:15 am - 6:32 pm
TRS
-
SEA
21h 17m
2 stops
$1,008Lufthansa
Thu, Aug 13 - Thu, Aug 20
Multiple Airlines Logo
3:40 pm - 10:55 pm
SEA
-
TRS
22h 15m
3 stops
Multiple Airlines Logo
7:15 pm - 8:40 pm
TRS
-
SEA
34h 25m
3 stops
$1,070Multiple Airlines
Thu, Aug 13 - Thu, Aug 20
Multiple Airlines Logo
7:00 am - 8:15 pm
SEA
-
TRS
28h 15m
3 stops
Multiple Airlines Logo
11:15 am - 11:45 am
TRS
-
SEA
33h 30m
2 stops
$1,103Multiple Airlines
Thu, Aug 13 - Thu, Aug 20
Lufthansa Logo
10:45 am - 1:55 pm
SEA
-
TRS
18h 10m
2 stops
Lufthansa Logo
2:50 pm - 11:55 am
TRS
-
SEA
30h 05m
1 stop
$1,175Lufthansa
Mon, Jul 20 - Mon, Aug 3
Lufthansa Logo
10:45 am - 1:55 pm
SEA
-
TRS
18h 10m
2 stops
Lufthansa Logo
2:50 pm - 11:55 am
TRS
-
SEA
30h 05m
1 stop
$1,177Lufthansa
Mon, Jul 20 - Mon, Aug 3
Multiple Airlines Logo
7:20 pm - 1:45 pm
SEA
-
TRS
33h 25m
2 stops
Multiple Airlines Logo
2:50 pm - 11:55 am
TRS
-
SEA
30h 05m
1 stop
$1,193Multiple Airlines
Mon, Jul 20 - Mon, Aug 3
Multiple Airlines Logo
10:45 am - 1:55 pm
SEA
-
TRS
18h 10m
2 stops
Multiple Airlines Logo
2:50 pm - 8:46 pm
TRS
-
SEA
38h 56m
2 stops
$1,203Multiple Airlines
Mon, Jul 20 - Mon, Aug 3
Multiple Airlines Logo
5:30 pm - 10:55 pm
SEA
-
TRS
20h 25m
1 stop
Multiple Airlines Logo
7:15 pm - 5:50 pm
TRS
-
SEA
31h 35m
1 stop
$1,210Multiple Airlines
Mon, Jul 20 - Mon, Aug 3

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Lufthansa flights from Seattle to Trieste

Our best Lufthansa deals on Seattle to Trieste flight tickets
Lufthansa
Aug 13
SEA10:40 amSeattle/Tacoma Intl
18h 15m
2 stops
TRS1:55 pmTrieste Ronchi dei Legionari
Aug 20
TRS6:15 amTrieste Ronchi dei Legionari
21h 17m
2 stops
SEA6:32 pmSeattle/Tacoma Intl
$992
Lufthansa
Aug 13
SEA2:10 pmSeattle/Tacoma Intl
14h 45m
1 stop
TRS1:55 pmTrieste Ronchi dei Legionari
Aug 20
TRS6:15 amTrieste Ronchi dei Legionari
21h 17m
2 stops
SEA6:32 pmSeattle/Tacoma Intl
$1,008
Lufthansa
Jul 20
SEA10:45 amSeattle/Tacoma Intl
18h 10m
2 stops
TRS1:55 pmTrieste Ronchi dei Legionari
Aug 3
TRS2:50 pmTrieste Ronchi dei Legionari
30h 05m
1 stop
SEA11:55 amSeattle/Tacoma Intl
$1,175

United Airlines flights from Seattle to Trieste

Our best United Airlines deals on Seattle to Trieste flight tickets
United Airlines
Nov 1
SEA11:16 pmSeattle/Tacoma Intl
26h 09m
2 stops
TRS10:25 amTrieste Ronchi dei Legionari
Nov 5
TRS6:35 amTrieste Ronchi dei Legionari
23h 24m
2 stops
SEA8:59 pmSeattle/Tacoma Intl
$1,213
United Airlines
Nov 1
SEA8:33 amSeattle/Tacoma Intl
40h 52m
3 stops
TRS10:25 amTrieste Ronchi dei Legionari
Nov 5
TRS6:35 amTrieste Ronchi dei Legionari
23h 48m
2 stops
SEA9:23 pmSeattle/Tacoma Intl
$1,232
United Airlines
Nov 1
SEA8:33 amSeattle/Tacoma Intl
40h 52m
3 stops
TRS10:25 amTrieste Ronchi dei Legionari
Nov 5
TRS6:35 amTrieste Ronchi dei Legionari
39h 50m
3 stops
SEA1:25 pmSeattle/Tacoma Intl
$1,512

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 July 1, 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 - TRS

SEATRS

Seattle/Tacoma Intl

Thu 8/13

5:30 pm-10:55 pm

1 stop20h 25m

Trieste Ronchi dei Legionari

Thu 8/20

6:35 am-5:50 pm

1 stop20h 15m

$984

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Thu 8/13

10:40 am-1:55 pm

2 stops18h 15m

Trieste Ronchi dei Legionari

Thu 8/20

6:15 am-6:32 pm

2 stops21h 17m

$992
Quickest round-trip

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Thu 8/13

2:10 pm-1:55 pm

1 stop14h 45m

Trieste Ronchi dei Legionari

Thu 8/20

6:15 am-6:32 pm

2 stops21h 17m

$1,008

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Thu 8/13

3:40 pm-10:55 pm

3 stops22h 15m

Trieste Ronchi dei Legionari

Thu 8/20

7:15 pm-8:40 pm

3 stops34h 25m

$1,070

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Thu 8/13

7:00 am-8:15 pm

3 stops28h 15m

Trieste Ronchi dei Legionari

Thu 8/20

11:15 am-11:45 am

2 stops33h 30m

$1,103

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Mon 7/20

10:45 am-1:55 pm

2 stops18h 10m

Trieste Ronchi dei Legionari

Mon 8/3

2:50 pm-11:55 am

1 stop30h 05m

$1,175

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Mon 7/20

10:45 am-1:55 pm

2 stops18h 10m

Trieste Ronchi dei Legionari

Mon 8/3

2:50 pm-11:55 am

1 stop30h 05m

$1,177

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Mon 7/20

7:20 pm-1:45 pm

2 stops33h 25m

Trieste Ronchi dei Legionari

Mon 8/3

2:50 pm-11:55 am

1 stop30h 05m

$1,193

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Mon 7/20

10:45 am-1:55 pm

2 stops18h 10m

Trieste Ronchi dei Legionari

Mon 8/3

2:50 pm-8:46 pm

2 stops38h 56m

$1,203

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Mon 7/20

5:30 pm-10:55 pm

1 stop20h 25m

Trieste Ronchi dei Legionari

Mon 8/3

7:15 pm-5:50 pm

1 stop31h 35m

$1,210

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 19 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 Lufthansa 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 50% 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

Fastest flight time

18h 10m

Direct flights

None
The fastest flight from Seattle to Trieste takes 18h 10m
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. 18h 10m 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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Fri 7/31
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Find better results for your trip to Italy

Fly your favorite airline to Trieste

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