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Harlingen

$228+ 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 8/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — HRL
Jul 16 — Jul 231
Wed 7/16
Wed 7/23
1 adult, Economy
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Cheap 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 11, 2025.

Round-trip from

$517
(American Airlines)

One-way from

$228
(United Airlines)

Popular in

July

Cheapest in

March

Average price

$644
From Seattle/Tacoma Intl to Harlingen Valley Intl
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One-way flight from Seattle/Tacoma Intl to Harlingen Valley Intl
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Highest demand for flights based on searches. 32% potential increase in price ($205 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($20 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find 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 11, 2025.

This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/411:32 pmSEA - HRL
1 stop8h 05mAmerican Airlines
Thu 8/76:20 pmHRL - SEA
1 stop8h 36mAmerican Airlines
Deal found 7/10$517
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.
Mon 8/45:00 amSEA - HRL
2 stops14h 50mUnited Airlines
Thu 8/77:10 amHRL - SEA
2 stops19h 49mUnited Airlines
Deal found 7/10$536
This Sun Country Air 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2111:59 pmSEA - HRL
1 stop8h 48mSun Country Air
Mon 12/2911:13 amHRL - SEA
1 stop25h 11mSun Country Air
Deal found 7/10$545
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/208:50 amSEA - HRL
2 stops9h 20mSouthwest
Sun 12/2812:00 pmHRL - SEA
2 stops9h 10mSouthwest
Deal found 7/10$947

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 11, 2025.
Use the filters below to find and compare flights from Seattle to Harlingen that are best for you.

Fly from

Seattle

Fly to

Harlingen

Route

Depart

Return

Price

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Mon 8/4

11:32 pm-9:37 am

1 stop8h 05m

Harlingen Valley Intl

Thu 8/7

6:20 pm-12:56 am

1 stop8h 36m

$517

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Mon 8/4

5:00 am-9:50 pm

2 stops14h 50m

Harlingen Valley Intl

Thu 8/7

7:10 am-12:59 am

2 stops19h 49m

$536

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Sun 12/21

11:59 pm-10:47 am

1 stop8h 48m

Harlingen Valley Intl

Sun 12/28

12:19 pm-5:12 pm

1 stop30h 53m

$545

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Sat 12/20

8:50 am-8:10 pm

2 stops9h 20m

Harlingen Valley Intl

Sun 12/28

12:00 pm-7:10 pm

2 stops9h 10m

$947

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Sat 8/9

11:58 pm-7:35 pm

1 stop17h 37m

$228

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/10

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

What is the cheapest month to book a flight from Seattle to Harlingen, Texas?

Currently, April is the cheapest month in which you can book a flight from Seattle to Harlingen, Texas (average of $267). Flying from Seattle to Harlingen, Texas in June is currently the most expensive (average of $381). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SEA to HRL?

Find hourly flight availability from Seattle to Harlingen. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 11, 2025.

It’s typically best to fly out from Seattle to Harlingen, Texas at noon. Doing so could potentially save you 43% on the flight price compared to flying in the afternoon, which is usually more expensive.

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 11, 2025.
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
8,846 reviews

Food

6.6

Overall

7.4

Entertainment

7.0

Crew

8.1

Comfort

7.3

Boarding

7.7

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
8,846 reviews
United Airlines
7.4
Good
8,846 reviews

Food

6.6

Overall

7.4

Entertainment

7.0

Crew

8.1

Comfort

7.3

Boarding

7.7

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
7.2
Good
10,000 reviews
United Airlines
7.4
Good
8,846 reviews

Food

6.6

Overall

7.4

Entertainment

7.0

Crew

8.1

Comfort

7.3

Boarding

7.7

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.

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

    Currently priced at $517, American Airlines will fly you from Seattle to Harlingen, Texas and back. In addition to American Airlines, many other airlines offer competitively priced options for your trip. Check Cheapflights for deals on United Airlines for as low as $536.

  • 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.

  • What is the cheapest month to book a flight from Seattle to Harlingen, Texas?

    Currently, April is the cheapest month in which you can book a flight from Seattle to Harlingen, Texas (average of $267). Flying from Seattle to Harlingen, Texas in June is currently the most expensive (average of $381). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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Top 3 airlines flying from Seattle to Harlingen

Discover the top 3 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 July 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$225Average$360FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$246Average$526FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$327Average$413FlexibilityNo cancel feeOn-time63%

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