SEA - STI

$304 Find Cheap Flights from Seattle to Santiago de los Caballeros

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Santiago de los Caballeros departing on 3/29. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Santiago de los Caballeros

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Santiago de los Caballeros, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Santiago de los Caballeros, as well as popular online travel agencies
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41,299,237 searches in the past 7 days on KAYAK

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Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$491
Delta
Fri 5/1Thu 5/7
SEA - STI • 1 stop
Cheapest one-way
$304
American Airlines
Sun 3/29
SEA - STI • 2 stops
Top airlines
Delta
Cheapest • from $491 (round-trip)
American Airlines
Best reviews • 7.1 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Seattle and Santiago de los Caballeros. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Newark (EWR)
Cheapest • Avg $490 (round-trip)
Newark (EWR)
Shortest trip • 11h 08m (one-way)
Insights
Insights
Insights
Insights
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Santiago de los Caballeros!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Seattle to Santiago de los Caballeros (SEA-STI)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle to Santiago de los Caballeros that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Seattle to Santiago de los Caballeros

Fri, May 1 - Thu, May 7
Delta Logo
10:40 pm - 7:33 pm
SEA
-
STI
17h 53m
1 stop
Delta Logo
6:00 am - 2:29 pm
STI
-
SEA
11h 29m
1 stop
$491Delta
Fri, May 1 - Tue, May 5
Delta Logo
11:14 pm - 7:33 pm
SEA
-
STI
17h 19m
2 stops
Delta Logo
8:59 pm - 12:25 pm
STI
-
SEA
18h 26m
2 stops
$495Delta
Fri, May 1 - Wed, May 6
Delta Logo
10:40 pm - 7:33 pm
SEA
-
STI
17h 53m
1 stop
Delta Logo
6:00 am - 10:31 pm
STI
-
SEA
19h 31m
1 stop
$511Delta
Wed, Apr 29 - Wed, May 6
United Airlines Logo
10:55 pm - 12:57 pm
SEA
-
STI
11h 02m
1 stop
United Airlines Logo
6:00 am - 7:48 pm
STI
-
SEA
16h 48m
2 stops
$515United Airlines
Mon, Aug 31 - Tue, Sep 8
American Airlines Logo
12:57 am - 8:48 pm
SEA
-
STI
16h 51m
2 stops
American Airlines Logo
1:31 pm - 11:42 pm
STI
-
SEA
13h 11m
1 stop
$558American Airlines
Wed, Apr 29 - Wed, May 6
American Airlines Logo
10:16 pm - 12:23 pm
SEA
-
STI
11h 07m
1 stop
American Airlines Logo
1:32 pm - 11:44 pm
STI
-
SEA
13h 12m
1 stop
$561American Airlines
Wed, Apr 22 - Fri, May 1
American Airlines Logo
10:16 pm - 12:23 pm
SEA
-
STI
11h 07m
1 stop
American Airlines Logo
1:32 pm - 9:35 am
STI
-
SEA
23h 03m
2 stops
$565American Airlines
Tue, Sep 1 - Tue, Sep 8
American Airlines Logo
8:08 pm - 8:48 pm
SEA
-
STI
21h 40m
1 stop
American Airlines Logo
7:00 am - 11:42 pm
STI
-
SEA
19h 42m
1 stop
$568American Airlines
Wed, Apr 22 - Fri, May 1
Delta Logo
11:14 pm - 7:33 pm
SEA
-
STI
17h 19m
2 stops
Delta Logo
6:00 am - 7:59 pm
STI
-
SEA
16h 59m
1 stop
$578Delta
Fri, May 1 - Wed, May 6
American Airlines Logo
10:16 pm - 12:23 pm
SEA
-
STI
11h 07m
1 stop
American Airlines Logo
1:32 pm - 11:44 pm
STI
-
SEA
13h 12m
1 stop
$594American Airlines
Booking Insights

KAYAK's insights & trends for Seattle to Santiago de los Caballeros flights

Get data-powered insights and trends into flights from Seattle to Santiago de los Caballeros to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from Seattle to Santiago de los Caballeros?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Seattle to Santiago de los Caballeros were found on Delta ($491) and United Airlines ($515).

Find deals

Good to know

Low seasonApril
Cheapest flight$304
Best time to beat the crowds with an average 40% drop in price.
Most popular time to fly with an average 3% increase in price.
Flight from Seattle to Santiago de los Caballeros

When to book flights from Seattle to Santiago de los Caballeros

Are your dates flexible? Find out the best times to travel from Seattle to Santiago de los Caballeros based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Seattle to Santiago de los Caballeros

  • What is the cheapest flight from Seattle to Santiago de los Caballeros?

    In the last 3 days, the lowest price for a flight from Seattle to Santiago de los Caballeros was $304 for a one-way ticket and $491 for a round-trip.

  • Do I need a passport to fly between Seattle and Santiago de los Caballeros?

    Yes

  • Which airports will I be using when flying from Seattle to Santiago de los Caballeros?

    On your way to Santiago de los Caballeros, you’ll fly out from Seattle/Tacoma Intl. You’ll be landing at Santiago de los Caballeros.

  • Which aircraft models fly most regularly from Seattle to Santiago de los Caballeros?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Seattle to Santiago de los Caballeros?

    oneworld is the only airline alliance operating flights between Seattle and Santiago de los Caballeros.

  • How does KAYAK find such low prices on flights from Seattle to Santiago de los Caballeros?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to Santiago de los Caballeros.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to Santiago de los Caballeros?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Santiago de los Caballeros from Seattle is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Seattle to Santiago de los Caballeros?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Santiago de los Caballeros with an airline and back to Seattle with another airline. Booking your flights between Seattle and STI can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to Santiago de los Caballeros?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Santiago de los Caballeros from Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Seattle to Santiago de los Caballeros

 
See real verified KAYAK customer reviews for airlines flying from Seattle to Santiago de los Caballeros. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Seattle to Santiago de los Caballeros? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.1
American AirlinesOverall score based on 11467 reviews
6.4Food
7.9Crew
7.2Comfort
6.9Entertainment
7.5Boarding
Airline reviews

Delay after delay with little communication then AA lost my luggage and at airport would not assist just said scan this QR code to track your luggage and submit a claim. However QR code provided did not work so have to go back to airport

4.0 OkaySean, Mar 2026
PSP - DFW
Read more American Airlines reviews

Delay after delay with little communication then AA lost my luggage and at airport would not assist just said scan this QR code to track your luggage and submit a claim. However QR code provided did not work so have to go back to airport

After changing the departure gate 5 times making us mo e from one side of the airport to the other and then back the flight was delayed nearly 2 hours. The male flight attendant had a bad attitude with the guest being condescending, disrespectful with people who were already on edge.

Easy boarding. Rows are smaller but that may be an older and bigger me now :)

It would have been nice if American tried to care.

American Airlines did everything they could with the high Spring Break crowd. I was frustrated to be changed from 1st class to a middle seat at the back of the plane. This has happened before, not sure booking 1st class and paying the extra actually works.

I booked 1st class, my flights were changed and I was sitting in the middle at the back of the plane. A far cry from the 1st class I purchased for my flights. I am grateful I arrived on time.

Aging planer and NO wifi on a 14 hour day flight. Unless you are retired or don't need to work or be in touch with the world... The lack of Wifif really ruined the flight. And the old plane - really showing it's age, wasn't great

There was no beverage service and the only time I saw a crew member walk through the cabin is when we were preparing to land.

Our flight was delayed 3 times and this is why I am giving such low reviews. Everything else was okay but being in the airport at 4:30pm for my initial flight at 7pm to not leave until after 9:30pm is insane,

Flights were constantly delayed. CRW took 50 minutes to get bags

Everything you need to know for your flight from Seattle to Santiago de los Caballeros

Information on your arrival and departure airports

Seattle (SEA)
Santiago de los Caballeros (STI)