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$180+ 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 5/19. Fares are subject to change and may not be available on all flights or dates of travel.
HRL — SEA
Apr 12 — Apr 191
Sun 4/12
Sun 4/19
1 adult, Economy
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Cheap 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 March 13, 2026.

This Southwest deal was found by Cheapflights users on 3/9. 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.
Tue 4/214:40 pm
HRL
-
SEA
2 stops8h 55m
Southwest
Sat 4/259:00 am
SEA
-
HRL
2 stops10h 35m
Southwest
Deal found 3/9$218
This American Airlines deal was found by Cheapflights users on 3/9. 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 4/2110:47 am
HRL
-
SEA
1 stop7h 04m
American Airlines
Sat 4/2511:55 pm
SEA
-
HRL
1 stop8h 22m
American Airlines
Deal found 3/9$235
This United Airlines deal was found by Cheapflights users on 3/8. 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.
Sat 5/212:10 pm
HRL
-
SEA
2 stops13h 19m
United Airlines
Tue 5/57:00 am
SEA
-
HRL
1 stop7h 04m
United Airlines
Deal found 3/8$332
This United Airlines deal was found by Cheapflights users on 3/9. 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.
Tue 4/219:20 am
HRL
-
SEA
3 stops16h 07m
United Airlines
Sat 4/258:45 am
SEA
-
HRL
2 stops11h 14m
United Airlines
Deal found 3/9$343
This American Airlines deal was found by Cheapflights users on 3/10. 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.
Wed 3/258:06 pm
HRL
-
SEA
1 stop6h 49m
American Airlines
Sat 3/2812:59 am
SEA
-
HRL
1 stop7h 13m
American Airlines
Deal found 3/10$404
This United Airlines deal was found by Cheapflights users on 3/9. 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.
Tue 3/2412:10 pm
HRL
-
SEA
1 stop9h 15m
United Airlines
Sat 3/288:59 am
SEA
-
HRL
2 stops10h 57m
United Airlines
Deal found 3/9$419
This American Airlines deal was found by Cheapflights users on 3/9. 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 3/2410:42 am
HRL
-
SEA
1 stop7h 15m
American Airlines
Fri 3/2712:59 am
SEA
-
HRL
1 stop7h 13m
American Airlines
Deal found 3/9$425

Find 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 March 13, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$218
(Southwest)

One-way from

$180
(Southwest)

Popular in

April

Cheapest in

February

Average price

$379
Provider with most accurate pricing for Harlingen Valley Intl-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Harlingen Valley Intl-Seattle/Tacoma Intl flights.
Search Deals
From Harlingen Valley Intl to Seattle/Tacoma Intl
Search Deals
One-way flight from Harlingen Valley Intl to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 0% potential increase in price ($2 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals

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 March 13, 2026.
Use the filters below to find and compare flights from Harlingen to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Sat 5/2

12:10 pm-11:29 pm

2 stops13h 19m

Seattle/Tacoma Intl

Tue 5/5

11:59 pm-11:23 am

1 stop9h 24m

$332

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Tue 4/21

9:20 am-11:27 pm

3 stops16h 07m

Seattle/Tacoma Intl

Sat 4/25

8:45 am-9:59 pm

2 stops11h 14m

$343

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Sat 5/16

3:35 pm-10:00 pm

2 stops8h 25m

Seattle/Tacoma Intl

Mon 6/15

5:15 am-5:00 pm

2 stops9h 45m

$404
Quickest round-trip

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Tue 3/24

10:42 am-3:57 pm

1 stop7h 15m

Seattle/Tacoma Intl

Fri 3/27

12:59 am-10:12 am

1 stop7h 13m

$425
Cheapest one-way

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Tue 5/19

4:40 pm-11:35 pm

2 stops8h 55m

$180

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Tue 3/24

2:36 pm-9:16 pm

1 stop8h 40m

$190
Quickest one-way

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Tue 5/19

2:51 pm-7:36 pm

1 stop6h 45m

$220

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Tue 3/24

9:20 am-7:28 pm

2 stops12h 08m

$229

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Tue 3/24

4:04 pm-12:03 am

2 stops9h 59m

$255

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/10

Sorted by cheapest first

Compare providers for flights from Harlingen to Seattle

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 Harlingen to Seattle in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust 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 Harlingen, Texas-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Harlingen, Texas-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Harlingen, Texas-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Harlingen, Texas-Seattle 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 Harlingen, Texas-Seattle 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 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, December is the cheapest month in which you can book a flight from Harlingen, Texas to Seattle (average of $149). Flying from Harlingen, Texas to Seattle in July is currently the most expensive (average of $307). 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 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 March 13, 2026.
Read through reviews of airlines operating flights from Harlingen to Seattle, such as Southwest,United Airlines, andAmerican Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,318 reviews

Food

7.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Anonymous,Mar 2026

KOA - HNL

pretty smooth and fast service ever, that flight is very helpful each and everyone for price and also fright for free..
Southwest
8.0
Very good
4,318 reviews
Southwest
8.0
Very good
4,318 reviews

Food

7.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Anonymous,Mar 2026

KOA - HNL

pretty smooth and fast service ever, that flight is very helpful each and everyone for price and also fright for free..
United Airlines
7.4
Good
9,419 reviews
Southwest
8.0
Very good
4,318 reviews

Food

7.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Anonymous,Mar 2026

KOA - HNL

pretty smooth and fast service ever, that flight is very helpful each and everyone for price and also fright for free..
American Airlines
7.1
Good
11,444 reviews
Southwest
8.0
Very good
4,318 reviews

Food

7.0

Entertainment

7.5

Boarding

8.1

Overall

8.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
10.0
Excellent

Anonymous,Mar 2026

KOA - HNL

pretty smooth and fast service ever, that flight is very helpful each and everyone for price and also fright for free..

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.

  • How long is the flight from Harlingen, Texas to Seattle?

    Airlines like United Airlines fly from Harlingen, Texas to Seattle in about 13h 19m. The time it takes to get you to your destination can typically vary by up to . There are 1984 mi between Harlingen, Texas and Seattle.

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

    American Airlines, at $215, was found to be the cheapest airline from Harlingen, Texas to Seattle.Alternate airlines to your destination round-trip include Southwest and United Airlines. American Airlines is currently priced 53% 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, December is the cheapest month in which you can book a flight from Harlingen, Texas to Seattle (average of $149). Flying from Harlingen, Texas to Seattle in July is currently the most expensive (average of $307). 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
Tacoma
SeaTac
Lakewood
Ocean Shores
Olympia
Kent
Lynnwood
Edmonds
Lacey
Renton
Puyallup
Kirkland
Tukwila
Fife
Aberdeen
Shoreline
Marysville
Centralia
Federal Way
Chehalis

Browse thousands of different options on Cheapflights for your next trip

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Top 3 airlines flying from Harlingen to Seattle

Discover the top 3 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 March 13, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$215Average$477FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$222Average$603FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$250Average$468FlexibilityNo cancel feeOn-time69%

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