Latest deals
Insights
When to book
FAQs
Price Alerts

Cheap flights from Seattle to Trieste from $555

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
0 bags

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Seattle to Trieste

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
2:10 pm - 1:55 pm
SEA
-
TRS
14h 45m
1 stop
Multiple Airlines Logo
6:15 am - 6:32 pm
TRS
-
SEA
21h 17m
2 stops
$1,050Multiple Airlines
Thu, Oct 1 - Thu, Oct 15
Lufthansa Logo
2:10 pm - 10:15 pm
SEA
-
TRS
23h 05m
1 stop
Lufthansa Logo
6:15 am - 12:20 pm
TRS
-
SEA
15h 05m
1 stop
$1,053Lufthansa
Thu, Oct 1 - Thu, Oct 15
Lufthansa Logo
1:56 pm - 10:15 pm
SEA
-
TRS
23h 19m
2 stops
Lufthansa Logo
6:15 am - 6:32 pm
TRS
-
SEA
21h 17m
2 stops
$1,058Lufthansa
Thu, Oct 1 - Thu, Oct 15
Multiple Airlines Logo
5:45 am - 10:15 pm
SEA
-
TRS
31h 30m
2 stops
Multiple Airlines Logo
6:15 am - 10:42 pm
TRS
-
SEA
25h 27m
2 stops
$1,094Multiple Airlines
Sat, Jul 18 - Sat, Jul 25
Lufthansa Logo
2:10 pm - 2:00 pm
SEA
-
TRS
14h 50m
1 stop
Lufthansa Logo
6:15 am - 10:42 pm
TRS
-
SEA
25h 27m
2 stops
$1,113Lufthansa
Sat, Jul 18 - Sat, Jul 25
United Airlines Logo
12:44 pm - 10:25 am
SEA
-
TRS
36h 41m
2 stops
United Airlines Logo
6:35 am - 9:04 pm
TRS
-
SEA
23h 29m
2 stops
$1,195United Airlines
Sun, Oct 18 - Thu, Oct 22
Lufthansa Logo
2:10 pm - 1:45 pm
SEA
-
TRS
14h 35m
1 stop
Lufthansa Logo
6:20 am - 2:22 pm
TRS
-
SEA
17h 02m
2 stops
$1,204Lufthansa
Tue, Jun 30 - Tue, Jul 7
Lufthansa Logo
2:10 pm - 1:45 pm
SEA
-
TRS
14h 35m
1 stop
Lufthansa Logo
6:20 am - 12:20 pm
TRS
-
SEA
15h 00m
1 stop
$1,220Lufthansa
Tue, Jun 30 - Tue, Jul 7
Lufthansa Logo
2:10 pm - 2:00 pm
SEA
-
TRS
14h 50m
1 stop
Lufthansa Logo
6:15 am - 11:55 am
TRS
-
SEA
14h 40m
1 stop
$1,291Lufthansa
Sat, Jul 18 - Sat, Jul 25
Multiple Airlines Logo
10:30 am - 11:00 pm
SEA
-
TRS
27h 30m
3 stops
Multiple Airlines Logo
9:10 pm - 5:10 pm
TRS
-
SEA
29h 00m
2 stops
$1,330Multiple Airlines
Thu, Oct 1 - Thu, Oct 15

Lufthansa flights from Seattle to Trieste

Our best Lufthansa deals on Seattle to Trieste flight tickets
Lufthansa
Oct 1
SEA2:10 pmSeattle/Tacoma Intl
23h 05m
1 stop
TRS10:15 pmTrieste Ronchi dei Legionari
Oct 15
TRS6:15 amTrieste Ronchi dei Legionari
15h 05m
1 stop
SEA12:20 pmSeattle/Tacoma Intl
$1,053
Lufthansa
Oct 1
SEA1:56 pmSeattle/Tacoma Intl
23h 19m
2 stops
TRS10:15 pmTrieste Ronchi dei Legionari
Oct 15
TRS6:15 amTrieste Ronchi dei Legionari
21h 17m
2 stops
SEA6:32 pmSeattle/Tacoma Intl
$1,058
Lufthansa
Jul 18
SEA2:10 pmSeattle/Tacoma Intl
14h 50m
1 stop
TRS2:00 pmTrieste Ronchi dei Legionari
Jul 25
TRS6:15 amTrieste Ronchi dei Legionari
25h 27m
2 stops
SEA10:42 pmSeattle/Tacoma Intl
$1,113

United Airlines flights from Seattle to Trieste

Our best United Airlines deals on Seattle to Trieste flight tickets
United Airlines
Oct 18
SEA12:44 pmSeattle/Tacoma Intl
36h 41m
2 stops
TRS10:25 amTrieste Ronchi dei Legionari
Oct 22
TRS6:35 amTrieste Ronchi dei Legionari
23h 29m
2 stops
SEA9:04 pmSeattle/Tacoma Intl
$1,195
United Airlines
May 25
SEA6:06 amSeattle/Tacoma Intl
43h 19m
3 stops
TRS10:25 amTrieste Ronchi dei Legionari
May 30
TRS6:35 amTrieste Ronchi dei Legionari
23h 33m
2 stops
SEA9:08 pmSeattle/Tacoma Intl
$2,114

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 May 16, 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 10/1

2:10 pm-1:55 pm

1 stop14h 45m

Trieste Ronchi dei Legionari

Thu 10/15

6:15 am-6:32 pm

2 stops21h 17m

$1,050

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Thu 10/1

2:10 pm-10:15 pm

1 stop23h 05m

Trieste Ronchi dei Legionari

Thu 10/15

6:15 am-12:20 pm

1 stop15h 05m

$1,053

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Thu 10/1

1:56 pm-10:15 pm

2 stops23h 19m

Trieste Ronchi dei Legionari

Thu 10/15

6:15 am-6:32 pm

2 stops21h 17m

$1,058

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Sat 7/18

5:45 am-10:15 pm

2 stops31h 30m

Trieste Ronchi dei Legionari

Sat 7/25

6:15 am-10:42 pm

2 stops25h 27m

$1,094

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Sat 7/18

2:10 pm-2:00 pm

1 stop14h 50m

Trieste Ronchi dei Legionari

Sat 7/25

6:15 am-10:42 pm

2 stops25h 27m

$1,113

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Sun 10/18

12:44 pm-10:25 am

2 stops36h 41m

Trieste Ronchi dei Legionari

Thu 10/22

6:35 am-9:04 pm

2 stops23h 29m

$1,195

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Tue 6/30

2:10 pm-1:45 pm

1 stop14h 35m

Trieste Ronchi dei Legionari

Tue 7/7

6:20 am-2:22 pm

2 stops17h 02m

$1,204

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Tue 6/30

2:10 pm-1:45 pm

1 stop14h 35m

Trieste Ronchi dei Legionari

Tue 7/7

6:20 am-12:20 pm

1 stop15h 00m

$1,220
Quickest round-trip

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Sat 7/18

2:10 pm-2:00 pm

1 stop14h 50m

Trieste Ronchi dei Legionari

Sat 7/25

6:15 am-11:55 am

1 stop14h 40m

$1,291

SeattleTrieste

SEA - TRS

SEATRS

Seattle/Tacoma Intl

Thu 10/1

10:30 am-11:00 pm

3 stops27h 30m

Trieste Ronchi dei Legionari

Thu 10/15

9:10 pm-5:10 pm

2 stops29h 00m

$1,330

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 resultsSorted by cheapest first
1
2

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?

KLM, Lufthansa, and United Airlines are the most popular carriers 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 39% of people opting to fly with this airline when traveling to Trieste. Keep in mind that there are 8 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

14h 45m

Direct flights

None
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
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.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Mon 6/15
Mon 6/22
By creating a price alert you accept our terms of use and privacy policy.

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
Delta
Lufthansa
Turkish Airlines
United Airlines
Scandinavian Airlines
Air France