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Harlingen

$277+ Cheap flights from Seattle to Harlingen, TX (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 11/3. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — HRL
oct. 25 — nov. 11
sáb. 10/25
sáb. 11/1
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 septiembre 25, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$197
(American Airlines)

Popular in

July

Cheapest in

March
Provider with most accurate pricing for Seattle/Tacoma Intl-Harlingen Valley Intl flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Harlingen Valley Intl flights.
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From Seattle/Tacoma Intl to Harlingen Valley Intl
Search Deals
Highest demand for flights based on searches. 30% potential increase in price ($189 potential increase over avg. RT price).
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Cheapest flight prices on average. 8% potential price decrease ($36 potential savings vs. average RT price).
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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 septiembre 25, 2025.

This American Airlines deal was found by Cheapflights users on 9/24. 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.
lun. 11/312:41 amSEA - HRL
1 stop7h 10mAmerican Airlines
dom. 11/98:04 pmHRL - SEA
1 stop6h 54mAmerican Airlines
Deal found 9/24$277
This United Airlines deal was found by Cheapflights users on 9/24. 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.
sáb. 10/188:30 amSEA - HRL
2 stops10h 46mUnited Airlines
mar. 10/212:05 pmHRL - SEA
1 stop7h 11mUnited Airlines
Deal found 9/24$338
This Southwest deal was found by Cheapflights users on 9/24. 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.
mar. 11/47:05 amSEA - HRL
2 stops12h 00mSouthwest
dom. 11/95:45 amHRL - SEA
2 stops10h 45mSouthwest
Deal found 9/24$364
This Southwest deal was found by Cheapflights users on 9/24. 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.
sáb. 10/185:00 amSEA - HRL
2 stops8h 30mSouthwest
mar. 10/213:45 pmHRL - SEA
2 stops9h 10mSouthwest
Deal found 9/24$377
This United Airlines deal was found by Cheapflights users on 9/24. 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.
jue. 10/96:35 amSEA - HRL
2 stops11h 06mUnited Airlines
lun. 10/135:17 pmHRL - SEA
1 stop7h 58mUnited Airlines
Deal found 9/24$433
This United Airlines deal was found by Cheapflights users on 9/24. 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.
mar. 11/47:28 pmSEA - HRL
2 stops13h 31mUnited Airlines
dom. 11/912:10 pmHRL - SEA
1 stop9h 15mUnited Airlines
Deal found 9/24$463
This Southwest deal was found by Cheapflights users on 9/24. 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.
mié. 10/87:10 amSEA - HRL
2 stops8h 15mSouthwest
jue. 10/910:45 amHRL - SEA
2 stops11h 30mSouthwest
Deal found 9/24$469
This Southwest deal was found by Cheapflights users on 9/25. 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.
lun. 9/295:00 amSEA - HRL
2 stops10h 10mSouthwest
mar. 9/306:20 amHRL - SEA
1 stop8h 35mSouthwest
Deal found 9/25$471
This American Airlines deal was found by Cheapflights users on 9/24. 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.
jue. 9/2511:44 amSEA - HRL
1 stop9h 08mAmerican Airlines
jue. 10/26:19 pmHRL - SEA
1 stop6h 40mAmerican Airlines
Deal found 9/24$479
This Southwest deal was found by Cheapflights users on 9/24. 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.
jue. 9/2510:45 pmSEA - HRL
1 stop8h 10mSouthwest
jue. 10/210:45 amHRL - SEA
2 stops11h 20mSouthwest
Deal found 9/24$489

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 septiembre 25, 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

lun. 11/3

12:41 am-9:51 am

1 stop7h 10m

Harlingen Valley Intl

dom. 11/9

8:04 pm-12:58 am

1 stop6h 54m

$277

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

sáb. 10/18

8:30 am-9:16 pm

2 stops10h 46m

Harlingen Valley Intl

mar. 10/21

2:05 pm-7:16 pm

1 stop7h 11m

$338

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

mar. 11/4

7:05 am-9:05 pm

2 stops12h 00m

Harlingen Valley Intl

dom. 11/9

5:45 am-2:30 pm

2 stops10h 45m

$364

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

sáb. 10/18

5:00 am-3:30 pm

2 stops8h 30m

Harlingen Valley Intl

mar. 10/21

3:45 pm-10:55 pm

2 stops9h 10m

$377

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

lun. 3/9

1:33 am-9:45 am

1 stop6h 12m

Harlingen Valley Intl

mié. 3/11

7:55 pm-12:49 am

1 stop6h 54m

$379

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

mar. 3/10

8:00 am-9:44 pm

2 stops11h 44m

Harlingen Valley Intl

mié. 3/11

5:15 am-1:58 pm

2 stops10h 43m

$427

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/24

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 September.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust 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, Texas flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Harlingen, Texas flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Harlingen, Texas flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Harlingen, Texas 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, Texas 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

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 $382). 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 septiembre 25, 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 septiembre 25, 2025.
Read reviews from past customers who have flown Southwest, 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.
Southwest
8.0
Very good
4,246 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Comfort

8.0

Overall

8.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,246 reviews
Southwest
8.0
Very good
4,246 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Comfort

8.0

Overall

8.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
8,926 reviews
Southwest
8.0
Very good
4,246 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Comfort

8.0

Overall

8.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,246 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Comfort

8.0

Overall

8.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

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, Texas?

    Departing from Seattle to Harlingen, Texas will take you 7h 10m. There are 1984 mi between Seattle and Harlingen, Texas. This flight may include one or multiple stops.

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

    Currently priced at $225, 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. Search Cheapflights for deals from United Airlines and Southwest - these airlines can fly you to your destination from $246 and $299, respectively. American Airlines is 49% cheaper than the average price of flights available within the next 90 days to this destination.

  • 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 $382). 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

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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 septiembre 25, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$225Average$387FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$246Average$583FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$299Average$413FlexibilityNo cancel feeOn-time63%

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