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$169+ Cheap flights from Harlingen, TX to Seattle (HRL - SEA)

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 9/7. Fares are subject to change and may not be available on all flights or dates of travel.
HRL — SEA
Aug 2 — Aug 91
Sat 8/2
Sat 8/9
1 adult, Economy
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Cheap flight deals from Harlingen to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Harlingen (HRL) to Seattle (SEA). 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 28, 2025.

Round-trip from

$283
(Southwest)

One-way from

$169
(American Airlines)

Popular in

July

Cheapest in

February

Average price

$610
From Harlingen Valley Intl to Seattle/Tacoma Intl
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One-way flight from Harlingen Valley Intl to Seattle/Tacoma Intl
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Highest demand for flights based on searches. 15% potential increase in price ($80 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($17 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 Harlingen to Seattle

Cheapest flights from Harlingen to Seattle
Explore the most affordable flight options available from Harlingen to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 28, 2025.

This Southwest deal was found by Cheapflights users on 7/27. 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.
Mon 8/115:45 amHRL - SEA
1 stop11h 05mSouthwest
Wed 8/2010:45 pmSEA - HRL
1 stop8h 10mSouthwest
Deal found 7/27$283
This American Airlines deal was found by Cheapflights users on 7/26. 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 9/235:45 amHRL - SEA
1 stop7h 05mAmerican Airlines
Sat 9/275:26 amSEA - HRL
1 stop6h 53mAmerican Airlines
Deal found 7/26$307
This United Airlines deal was found by Cheapflights users on 7/28. 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 8/115:10 amHRL - SEA
1 stop7h 12mUnited Airlines
Wed 8/207:10 amSEA - HRL
1 stop6h 52mUnited Airlines
Deal found 7/28$408

Cheapflights Fare Finder

 
Customize your flight search to find flights from Harlingen to Seattle 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 28, 2025.
Use the filters below to find and compare flights from Harlingen to Seattle that are best for you.

Fly from

Harlingen

Fly to

Seattle

Route

Depart

Return

Price

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Mon 8/11

5:45 am-2:50 pm

1 stop11h 05m

Seattle/Tacoma Intl

Wed 8/20

10:45 pm-8:55 am

1 stop8h 10m

$283

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Tue 9/23

5:45 am-10:50 am

1 stop7h 05m

Seattle/Tacoma Intl

Sat 9/27

5:26 am-2:19 pm

1 stop6h 53m

$307

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Mon 8/11

5:10 am-10:22 am

1 stop7h 12m

Seattle/Tacoma Intl

Wed 8/20

7:10 am-4:02 pm

1 stop6h 52m

$408

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Sun 9/7

6:19 pm-10:59 pm

1 stop6h 40m

$169

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Sun 9/7

5:00 am-1:28 pm

2 stops10h 28m

$264

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

Best time to book a flight from Harlingen to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Harlingen 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 Harlingen to Seattle

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

Currently, January is the cheapest month in which you can book a flight from Harlingen, Texas to Seattle (average of $238). Flying from Harlingen, Texas to Seattle in June is currently the most expensive (average of $389). 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 HRL to SEA?

Find hourly flight availability from Harlingen to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 28, 2025.

It’s typically best to fly out from Harlingen, Texas to Seattle in the morning. Doing so could potentially save you 29% on the flight price compared to flying at noon, which is usually more expensive.

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated July 28, 2025.
Read through reviews of airlines operating flights from Harlingen to Seattle, such as Southwest, United Airlines, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,238 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Southwest
8.0
Very good
4,238 reviews
Southwest
8.0
Very good
4,238 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
United Airlines
7.4
Good
8,892 reviews
Southwest
8.0
Very good
4,238 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,238 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Food

7.0

Comfort

8.0

Boarding

8.1

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

Related info for your journey

Find useful and relevant information for your journey from Harlingen to Seattle. 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 Harlingen, Texas to Seattle round-trip?

    Southwest, at $283, was found to be the cheapest airline from Harlingen, Texas to Seattle.Alternate airlines to your destination round-trip include American Airlines and United Airlines. Southwest is currently priced 33% below the average price you’ll pay for this route.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Harlingen to Seattle 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 Harlingen, Texas to Seattle?

    Currently, January is the cheapest month in which you can book a flight from Harlingen, Texas to Seattle (average of $238). Flying from Harlingen, Texas to Seattle in June is currently the most expensive (average of $389). 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.

See more FAQs

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
SeaTac
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Kent
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Top 4 airlines flying from Harlingen to Seattle

Discover the top 4 airlines that operate flights from Harlingen to Seattle. 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 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$187Average$297FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$251Average$437FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$278Average$484FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$328Average$603FlexibilityNo cancel feeOn-time63%

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