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Harlingen

$329+ Cheap flights from Seattle to Harlingen (SEA - HRL)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/27. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — HRL
Aug 11 — Aug 181
Tue 8/11
Tue 8/18
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 July 12, 2026.

This United Airlines deal was found by Cheapflights users on 7/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/277:03 am
SEA
-
HRL
1 stop6h 57m
United Airlines
Wed 10/281:59 pm
HRL
-
SEA
1 stop7h 18m
United Airlines
Deal found 7/10$329
This Southwest deal was found by Cheapflights users on 7/7. 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.
Thu 8/66:15 am
SEA
-
HRL
2 stops7h 50m
Southwest
Wed 8/121:45 pm
HRL
-
SEA
2 stops10h 00m
Southwest
Deal found 7/7$369
This Southwest deal was found by Cheapflights users on 7/7. 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.
Wed 8/56:40 am
SEA
-
HRL
2 stops11h 30m
Southwest
Wed 8/121:45 pm
HRL
-
SEA
2 stops10h 00m
Southwest
Deal found 7/7$400

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 July 12, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$329
(United Airlines)

Popular in

December

Cheapest in

May

Average price

$797
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
Highest demand for flights based on searches. 17% potential increase in price ($113 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 11% potential price decrease ($58 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
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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 July 12, 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

Tue 10/27

7:03 am-4:00 pm

1 stop6h 57m

Harlingen Valley Intl

Wed 10/28

5:05 am-2:26 pm

2 stops11h 21m

$334
Quickest round-trip

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Thu 8/6

6:15 am-4:05 pm

2 stops7h 50m

Harlingen Valley Intl

Wed 8/12

1:45 pm-9:45 pm

2 stops10h 00m

$369

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Wed 8/5

6:40 am-8:10 pm

2 stops11h 30m

Harlingen Valley Intl

Wed 8/12

1:45 pm-9:45 pm

2 stops10h 00m

$400

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Fri 10/30

8:40 pm-4:00 pm

2 stops17h 20m

Harlingen Valley Intl

Tue 11/3

7:18 am-1:25 pm

1 stop8h 07m

$441

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Sat 11/21

8:55 am-5:45 pm

1 stop6h 50m

Harlingen Valley Intl

Mon 11/30

11:50 am-9:15 pm

1 stop11h 25m

$456

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Fri 11/20

8:30 am-5:15 pm

1 stop6h 45m

Harlingen Valley Intl

Mon 11/30

11:50 am-9:15 pm

1 stop11h 25m

$458
Cheapest one-way
Quickest one-way

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Sun 8/2

5:30 am-4:00 pm

2 stops8h 30m

$439

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/8

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 July.
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.

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 July 12, 2026.
Read reviews from past customers who have flown 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.
American Airlines
7.1
Good
11,809 reviews

Food

6.4

Comfort

7.2

Entertainment

6.8

Crew

7.9

Overall

7.1

Boarding

7.5

Reviews

1 / 20
8.0
Excellent

Monica,Nov 2025

JAC - DFW

At least there was an option of entertainment on this flight.
American Airlines
7.1
Good
11,809 reviews
American Airlines
7.1
Good
11,809 reviews

Food

6.4

Comfort

7.2

Entertainment

6.8

Crew

7.9

Overall

7.1

Boarding

7.5

Reviews

1 / 20
8.0
Excellent

Monica,Nov 2025

JAC - DFW

At least there was an option of entertainment on this flight.

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 $334, United Airlines can have you in Harlingen from Seattle in 6h 57m. 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 is the cheapest airline to fly from Seattle to Harlingen round-trip?

    Flying on American Airlines is currently your cheapest option to Harlingen, with prices starting at $237. American Airlines is currently priced 56% 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 airline flying from Seattle to Harlingen

Discover the top airline 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 July 12, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$237Average$455FlexibilityNo cancel feeOn-time71%

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