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Harlingen

$119+ 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
Mar 7 — Mar 141
Sat 3/7
Sat 3/14
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 February 5, 2026.

This American Airlines deal was found by Cheapflights users on 2/3. 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.
Fri 2/2712:59 am
SEA
-
HRL
1 stop7h 13m
American Airlines
Wed 3/118:06 pm
HRL
-
SEA
1 stop6h 49m
American Airlines
Deal found 2/3$307
This American Airlines deal was found by Cheapflights users on 2/3. 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 3/37:29 pm
SEA
-
HRL
2 stops12h 43m
American Airlines
Wed 3/118:06 pm
HRL
-
SEA
1 stop6h 49m
American Airlines
Deal found 2/3$312
This American Airlines deal was found by Cheapflights users on 2/3. 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.
Fri 2/2711:57 pm
SEA
-
HRL
1 stop8h 15m
American Airlines
Wed 3/118:06 pm
HRL
-
SEA
1 stop6h 49m
American Airlines
Deal found 2/3$317
This American Airlines deal was found by Cheapflights users on 2/3. 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 3/27:29 pm
SEA
-
HRL
2 stops12h 43m
American Airlines
Wed 3/118:06 pm
HRL
-
SEA
1 stop6h 49m
American Airlines
Deal found 2/3$322
This United Airlines deal was found by Cheapflights users on 2/2. 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 4/86:30 am
SEA
-
HRL
1 stop7h 34m
United Airlines
Wed 4/1512:05 pm
HRL
-
SEA
1 stop9h 37m
United Airlines
Deal found 2/2$327
This American Airlines deal was found by Cheapflights users on 2/5. 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 3/105:30 am
SEA
-
HRL
1 stop6h 35m
American Airlines
Thu 3/128:06 pm
HRL
-
SEA
1 stop6h 49m
American Airlines
Deal found 2/5$329
This United Airlines deal was found by Cheapflights users on 2/2. 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 4/77:37 pm
SEA
-
HRL
2 stops13h 46m
United Airlines
Thu 4/165:18 pm
HRL
-
SEA
1 stop7h 32m
United Airlines
Deal found 2/2$332
This American Airlines deal was found by Cheapflights users on 2/2. 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 3/3012:59 am
SEA
-
HRL
1 stop7h 13m
American Airlines
Wed 4/88:03 pm
HRL
-
SEA
1 stop6h 41m
American Airlines
Deal found 2/2$337
This American Airlines deal was found by Cheapflights users on 2/3. 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.
Sun 3/17:29 pm
SEA
-
HRL
2 stops12h 43m
American Airlines
Wed 3/118:06 pm
HRL
-
SEA
1 stop6h 49m
American Airlines
Deal found 2/3$342
This American Airlines deal was found by Cheapflights users on 2/2. 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 4/812:59 am
SEA
-
HRL
1 stop7h 18m
American Airlines
Thu 4/167:53 pm
HRL
-
SEA
1 stop6h 51m
American Airlines
Deal found 2/2$347
This American Airlines deal was found by Cheapflights users on 2/3. 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.
Sun 3/17:29 pm
SEA
-
HRL
2 stops12h 43m
American Airlines
Mon 3/98:06 pm
HRL
-
SEA
1 stop6h 49m
American Airlines
Deal found 2/3$352
This American Airlines deal was found by Cheapflights users on 2/3. 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 3/3112:59 am
SEA
-
HRL
1 stop7h 13m
American Airlines
Wed 4/88:03 pm
HRL
-
SEA
1 stop6h 41m
American Airlines
Deal found 2/3$365

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 February 5, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$307
(American Airlines)

One-way from

$119
(American Airlines)

Popular in

December

Cheapest in

March

Average price

$400
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. 18% potential increase in price ($120 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 12% potential price decrease ($60 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
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 February 5, 2026.
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

Fri 2/27

11:57 pm-10:12 am

1 stop8h 15m

Harlingen Valley Intl

Mon 3/9

8:06 pm-12:55 am

1 stop6h 49m

$327

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Wed 4/8

6:30 am-4:04 pm

1 stop7h 34m

Harlingen Valley Intl

Wed 4/15

12:05 pm-7:42 pm

1 stop9h 37m

$327

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Tue 3/10

5:30 am-2:05 pm

1 stop6h 35m

Harlingen Valley Intl

Thu 3/12

8:06 pm-12:55 am

1 stop6h 49m

$329

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Thu 4/9

6:20 am-9:59 pm

2 stops13h 39m

Harlingen Valley Intl

Tue 4/14

5:18 pm-10:50 pm

1 stop7h 32m

$332

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Tue 4/7

7:37 pm-11:23 am

2 stops13h 46m

Harlingen Valley Intl

Tue 4/14

5:18 pm-10:50 pm

1 stop7h 32m

$332

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Thu 4/9

6:20 am-9:59 pm

2 stops13h 39m

Harlingen Valley Intl

Thu 4/16

12:05 pm-7:42 pm

1 stop9h 37m

$332

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Thu 4/9

6:20 am-9:59 pm

2 stops13h 39m

Harlingen Valley Intl

Wed 4/15

12:05 pm-8:57 pm

2 stops10h 52m

$337

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Wed 3/4

6:44 am-6:16 pm

1 stop9h 32m

Harlingen Valley Intl

Tue 3/10

10:42 am-10:42 pm

2 stops14h 00m

$382

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Tue 3/10

11:59 pm-11:16 am

1 stop9h 17m

Harlingen Valley Intl

Thu 3/12

5:25 pm-10:59 pm

1 stop7h 34m

$387

SeattleHarlingen

SEA - HRL

SEAHRL

Seattle/Tacoma Intl

Tue 3/31

6:30 am-4:04 pm

1 stop7h 34m

Harlingen Valley Intl

Tue 4/7

12:05 pm-7:42 pm

1 stop9h 37m

$387

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/4

Showing 1-10 of 17 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 February.
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, 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, November is the cheapest month in which you can book a flight from Seattle to Harlingen, Texas (average of $216). 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.

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 February 5, 2026.
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
9,240 reviews

Food

6.6

Boarding

7.7

Comfort

7.3

Crew

8.1

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
9,240 reviews
United Airlines
7.4
Good
9,240 reviews

Food

6.6

Boarding

7.7

Comfort

7.3

Crew

8.1

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
11,237 reviews
United Airlines
7.4
Good
9,240 reviews

Food

6.6

Boarding

7.7

Comfort

7.3

Crew

8.1

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 6h 35m. 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 56% 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, November is the cheapest month in which you can book a flight from Seattle to Harlingen, Texas (average of $216). 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 February 5, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$225Average$403FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$246Average$583FlexibilityNo cancel feeOn-time69%

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