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Harlingen

$198+ Cheap flights from Seattle to Harlingen (SEA - HRL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/16. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — HRL
Jun 8 — Jun 151
Mon 6/8
Mon 6/15
1 adult, Economy
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Cheap flight deals from Seattle to Harlingen

Cheapest flights from Seattle to Harlingen
Explore the most affordable flight options available from Seattle to Harlingen. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 9, 2026.

This Southwest deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/75:30 am
SEA
-
HRL
2 stops9h 45m
Southwest
Wed 8/194:25 pm
HRL
-
SEA
2 stops8h 40m
Southwest
Deal found 5/4$372
This Southwest deal was found by Cheapflights users on 5/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/155:00 am
SEA
-
HRL
2 stops8h 50m
Southwest
Sat 8/226:05 am
HRL
-
SEA
2 stops10h 15m
Southwest
Deal found 5/7$389
This American Airlines deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/2311:24 pm
SEA
-
HRL
1 stop8h 49m
American Airlines
Tue 6/308:04 pm
HRL
-
SEA
1 stop6h 55m
American Airlines
Deal found 5/4$417
This Southwest deal was found by Cheapflights users on 5/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/99:00 am
SEA
-
HRL
2 stops10h 35m
Southwest
Sat 5/1612:10 pm
HRL
-
SEA
2 stops11h 50m
Southwest
Deal found 5/6$471
This Southwest deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/209:20 am
SEA
-
HRL
2 stops9h 35m
Southwest
Sun 5/244:20 pm
HRL
-
SEA
2 stops9h 45m
Southwest
Deal found 5/4$512

Find flight deals from Seattle to Harlingen

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Harlingen (HRL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated May 9, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$372
(Southwest)

One-way from

$198
(American Airlines)

Popular in

December

Cheapest in

January

Average price

$476
Provider with most accurate pricing for Seattle/Tacoma Intl-Harlingen Valley Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Harlingen Valley Intl flights.
Search Deals
From Seattle/Tacoma Intl to Harlingen Valley Intl
Search Deals
One-way flight from Seattle/Tacoma Intl to Harlingen Valley Intl
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($30 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($33 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Harlingen 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, Cheapflights users made 2,558,603 searches. Data last updated May 9, 2026.
Use the filters below to find and compare flights from Seattle to Harlingen that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Fri 8/7

12:35 pm-8:30 pm

1 stop5h 55m

Harlingen Valley Intl

Wed 8/19

1:45 pm-11:05 pm

2 stops11h 20m

$388

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Wed 5/20

9:20 am-8:55 pm

2 stops9h 35m

Harlingen Valley Intl

Sun 5/24

4:20 pm-12:05 am

2 stops9h 45m

$512

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Wed 6/3

5:00 am-3:59 pm

1 stop8h 59m

Harlingen Valley Intl

Sat 6/6

5:10 am-1:13 am

2 stops22h 03m

$550
Quickest round-trip

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Fri 5/22

5:00 am-3:59 pm

1 stop8h 59m

Harlingen Valley Intl

Tue 5/26

5:10 am-10:47 am

1 stop7h 37m

$679

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Tue 6/23

11:24 pm-10:13 am

1 stop8h 49m

Harlingen Valley Intl

Tue 6/30

6:00 am-1:57 pm

2 stops9h 57m

$680
Cheapest one-way
Quickest one-way

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Sat 5/16

8:51 am-9:59 pm

2 stops11h 08m

$203

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/4

Sorted by cheapest first

Compare providers for flights from Seattle to Harlingen

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Harlingen in May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seattle-Harlingen flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Harlingen flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Harlingen flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Harlingen flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Harlingen flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Seattle to Harlingen

Have a flexible travel schedule? Discover the best time to fly to Harlingen from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Harlingen

How much does it cost to fly round-trip from Seattle to Harlingen?

Reviews of airlines servicing Harlingen

Get insights into the airlines that provide service to Harlingen. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Harlingen. Reviews last updated May 9, 2026.
Read reviews from past customers who have flown United Airlines and American Airlines from Seattle to Harlingen. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,692 reviews

Boarding

7.7

Crew

8.1

Food

6.6

Overall

7.4

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

FERNANDO,Sep 2024

YYC - IAH

Everything was good, maybe can give better foof flys more than 4 hours
United Airlines
7.4
Good
9,692 reviews
United Airlines
7.4
Good
9,692 reviews

Boarding

7.7

Crew

8.1

Food

6.6

Overall

7.4

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

FERNANDO,Sep 2024

YYC - IAH

Everything was good, maybe can give better foof flys more than 4 hours
American Airlines
7.1
Good
11,669 reviews
United Airlines
7.4
Good
9,692 reviews

Boarding

7.7

Crew

8.1

Food

6.6

Overall

7.4

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

FERNANDO,Sep 2024

YYC - IAH

Everything was good, maybe can give better foof flys more than 4 hours

Related info for your journey

Find useful and relevant information for your journey from Seattle to Harlingen. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Seattle to Harlingen?

    For as low as $388, Southwest can have you in Harlingen from Seattle in 5h 55m. The distance between Seattle and Harlingen is about 1984 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from Seattle to Harlingen round-trip?

    Flying on American Airlines is currently your cheapest option to Harlingen, with prices starting at $237. Another option worth looking into is United Airlines, starting at $246 round trip. American Airlines is currently priced 54% below the average price you’ll pay for this route.

  • Can I find deals for flights from Seattle to Harlingen that include hotel bookings?

    Yes. In addition to deals on Seattle to Harlingen flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Harlingen?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Harlingen.

  • Can I find deals for business class flights from Seattle to Harlingen?

    Yes. Cheapflights offers flight deals from Seattle to Harlingen by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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Top 2 airlines flying from Seattle to Harlingen

Discover the top 2 airlines that operate flights from Seattle to Harlingen. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated May 9, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$237Average$457FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$246Average$583FlexibilityNo cancel feeOn-time69%

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