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Harlingen

$108+ Cheap flights from Seattle to Harlingen, TX (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 3/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — HRL
Jan 11 — Jan 181
Sun 1/11
Sun 1/18
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 December 12, 2025.

This United Airlines deal was found by Cheapflights users on 12/9. 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.
Wed 12/3111:59 pmSEA - HRL
1 stop9h 14mUnited Airlines
Sat 1/1012:10 pmHRL - SEA
2 stops11h 05mUnited Airlines
Deal found 12/9$242
This United Airlines deal was found by Cheapflights users on 12/9. 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.
Wed 12/317:12 pmSEA - HRL
2 stops14h 01mUnited Airlines
Sat 1/179:20 amHRL - SEA
2 stops13h 52mUnited Airlines
Deal found 12/9$347
This American Airlines deal was found by Cheapflights users on 12/9. 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 12/3012:59 amSEA - HRL
1 stop6h 41mAmerican Airlines
Sat 1/176:02 amHRL - SEA
1 stop6h 59mAmerican Airlines
Deal found 12/9$369
This United Airlines deal was found by Cheapflights users on 12/9. 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.
Wed 12/3111:59 pmSEA - HRL
1 stop9h 14mUnited Airlines
Tue 1/65:25 pmHRL - SEA
2 stops18h 30mUnited Airlines
Deal found 12/9$441
This Southwest deal was found by Cheapflights users on 12/9. 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 12/319:35 amSEA - HRL
2 stops10h 30mSouthwest
Mon 1/53:35 pmHRL - SEA
2 stops11h 00mSouthwest
Deal found 12/9$563
This United Airlines deal was found by Cheapflights users on 12/9. 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.
Wed 12/3111:59 pmSEA - HRL
1 stop9h 14mUnited Airlines
Mon 1/57:00 amHRL - SEA
2 stops13h 06mUnited Airlines
Deal found 12/9$591
This American Airlines deal was found by Cheapflights users on 12/9. 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.
Wed 12/315:23 amSEA - HRL
1 stop13h 04mAmerican Airlines
Sun 1/48:11 pmHRL - SEA
1 stop16h 48mAmerican Airlines
Deal found 12/9$682

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 December 12, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$206
(American Airlines)

One-way from

$108
(American Airlines)

Popular in

July

Cheapest in

January

Average price

$670
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. 27% potential increase in price ($171 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease ($34 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 12, 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

Thu 1/8

11:55 am-11:21 pm

1 stop9h 26m

Harlingen Valley Intl

Sat 1/10

11:06 am-5:45 pm

1 stop8h 39m

$206

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Sun 1/11

7:35 am-6:14 pm

1 stop8h 39m

Harlingen Valley Intl

Wed 1/14

6:02 am-11:01 am

1 stop6h 59m

$224

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Wed 12/31

11:59 pm-11:13 am

1 stop9h 14m

Harlingen Valley Intl

Sat 1/10

12:10 pm-9:15 pm

2 stops11h 05m

$242

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Fri 1/9

7:35 am-6:14 pm

1 stop8h 39m

Harlingen Valley Intl

Fri 1/16

6:44 pm-11:51 pm

1 stop7h 07m

$256

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Thu 1/8

8:40 am-9:59 pm

2 stops11h 19m

Harlingen Valley Intl

Sat 1/10

12:10 pm-9:15 pm

2 stops11h 05m

$257

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Thu 1/15

12:57 pm-9:59 pm

1 stop7h 02m

Harlingen Valley Intl

Sat 1/17

5:25 pm-11:01 pm

1 stop7h 36m

$337

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Fri 1/9

7:30 pm-11:26 am

2 stops13h 56m

Harlingen Valley Intl

Fri 1/16

7:00 am-12:49 pm

1 stop7h 49m

$339

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Mon 3/9

5:37 am-2:14 pm

1 stop6h 37m

$108

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Fri 3/6

12:59 am-10:05 am

1 stop7h 06m

$117

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Wed 2/11

9:25 am-9:59 pm

2 stops10h 34m

$124

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/11

Showing 1-10 of 19 results
1
2

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 December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star

*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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Seattle-Harlingen, Texas flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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, January is the cheapest month in which you can book a flight from Seattle to Harlingen, Texas (average of $204). Flying from Seattle to Harlingen, Texas in July is currently the most expensive (average of $369). 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 December 12, 2025.

It’s typically best to fly out from Seattle to Harlingen, Texas at noon. Doing so could potentially save you 42% 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 December 12, 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
9,095 reviews

Food

6.6

Comfort

7.3

Crew

8.1

Boarding

7.7

Entertainment

7.1

Overall

7.4

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
9,095 reviews
United Airlines
7.4
Good
9,095 reviews

Food

6.6

Comfort

7.3

Crew

8.1

Boarding

7.7

Entertainment

7.1

Overall

7.4

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
11,050 reviews
United Airlines
7.4
Good
9,095 reviews

Food

6.6

Comfort

7.3

Crew

8.1

Boarding

7.7

Entertainment

7.1

Overall

7.4

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, Texas?

    Departing from Seattle to Harlingen, Texas will take you 9h 14m. 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. Check Cheapflights for deals on United Airlines for as low as $246. American Airlines is 51% 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, January is the cheapest month in which you can book a flight from Seattle to Harlingen, Texas (average of $204). Flying from Seattle to Harlingen, Texas in July is currently the most expensive (average of $369). 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 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 December 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$225Average$390FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$246Average$583FlexibilityNo cancel feeOn-time69%

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