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$363+ Cheap flights from Harlingen, TX to Seattle (HRL - SEA)

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 11/11. Fares are subject to change and may not be available on all flights or dates of travel.
HRL — SEA
Nov 27 — Dec 41
Thu 11/27
Thu 12/4
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 October 28, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$363
(American Airlines)

Popular in

July

Cheapest in

February

Average price

$463
Provider with most accurate pricing for Harlingen Valley Intl-Seattle/Tacoma Intl flight deals.
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Provider most trusted by Cheapflights users for Harlingen Valley Intl-Seattle/Tacoma Intl flights.
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From Harlingen Valley Intl to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($63 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($17 potential savings vs. average RT price).
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Average for round-trip flights in October 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 October 28, 2025.

This American Airlines deal was found by Cheapflights users on 10/26. 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 11/116:40 pmHRL - SEA
1 stop7h 02mAmerican Airlines
Tue 11/187:23 amSEA - HRL
1 stop8h 47mAmerican Airlines
Deal found 10/26$363
This Southwest deal was found by Cheapflights users on 10/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1111:30 amHRL - SEA
2 stops13h 00mSouthwest
Tue 11/189:35 amSEA - HRL
2 stops10h 20mSouthwest
Deal found 10/26$370
This American Airlines deal was found by Cheapflights users on 10/27. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/74:02 pmHRL - SEA
1 stop7h 14mAmerican Airlines
Mon 11/105:24 amSEA - HRL
1 stop8h 08mAmerican Airlines
Deal found 10/27$414
This Booking.com deal was found by Cheapflights users on 10/26. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/2612:22 pmHRL - SEA
1 stop12h 24mSun Country Air
Sun 11/3011:59 pmSEA - HRL
1 stop9h 02mSun Country Air
Deal found 10/26$445
This United Airlines deal was found by Cheapflights users on 10/26. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1112:10 pmHRL - SEA
3 stops13h 34mUnited Airlines
Tue 11/185:30 amSEA - HRL
2 stops14h 24mUnited Airlines
Deal found 10/26$452
This Sun Country Air deal was found by Cheapflights users on 10/26. 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2811:49 amHRL - SEA
1 stop22h 32mSun Country Air
Sat 1/36:28 pmSEA - HRL
1 stop14h 31mSun Country Air
Deal found 10/26$465
This American Airlines deal was found by Cheapflights users on 10/27. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/136:10 pmHRL - SEA
1 stop7h 28mAmerican Airlines
Sat 12/206:02 pmSEA - HRL
1 stop13h 38mAmerican Airlines
Deal found 10/27$472
This United Airlines deal was found by Cheapflights users on 10/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/315:00 pmHRL - SEA
1 stop7h 46mUnited Airlines
Sun 11/28:36 amSEA - HRL
2 stops11h 18mUnited Airlines
Deal found 10/27$474
This Kiwi.com deal was found by Cheapflights users on 10/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2811:49 amHRL - SEA
1 stop22h 32mMultiple Airlines
Sat 1/32:54 pmSEA - HRL
2 stops18h 05mMultiple Airlines
Deal found 10/26$490

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 October 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

Tue 11/11

6:40 pm-11:42 pm

1 stop7h 02m

Seattle/Tacoma Intl

Tue 11/18

7:23 am-6:10 pm

1 stop8h 47m

$363

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Tue 11/11

11:30 am-10:30 pm

2 stops13h 00m

Seattle/Tacoma Intl

Tue 11/18

9:35 am-9:55 pm

2 stops10h 20m

$370

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Fri 11/7

12:11 pm-7:00 pm

1 stop8h 49m

Seattle/Tacoma Intl

Sun 11/9

12:59 am-9:51 am

1 stop6h 52m

$414

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Sat 12/13

6:10 pm-11:38 pm

1 stop7h 28m

Seattle/Tacoma Intl

Sat 12/20

6:02 pm-9:40 am

1 stop13h 38m

$472

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Sun 12/28

11:49 am-8:21 am

1 stop22h 32m

Seattle/Tacoma Intl

Sat 1/3

2:54 pm-10:59 am

2 stops18h 05m

$490

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Sat 12/13

5:36 am-10:38 am

1 stop7h 02m

Seattle/Tacoma Intl

Sat 12/13

2:19 pm-11:11 pm

1 stop6h 52m

$531

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Fri 11/7

12:10 pm-7:25 pm

1 stop9h 15m

Seattle/Tacoma Intl

Mon 11/10

9:04 am-9:54 pm

2 stops10h 50m

$544

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Sat 12/13

7:00 am-3:29 pm

2 stops10h 29m

Seattle/Tacoma Intl

Sat 12/13

11:59 pm-11:04 am

1 stop9h 05m

$586

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Sun 11/23

12:10 pm-11:56 am

2 stops25h 46m

Seattle/Tacoma Intl

Sun 11/30

11:59 pm-11:01 am

1 stop9h 02m

$587

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/26

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 October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
PricelinePrice Accuracy1 starTrust Score*3 stars
eDreamsPrice 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 Harlingen, Texas-Seattle flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Harlingen, Texas-Seattle flight deals on Cheapflights vs. eDreams >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 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 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, April is the cheapest month in which you can book a flight from Harlingen, Texas to Seattle (average of $196). Flying from Harlingen, Texas to Seattle in December is currently the most expensive (average of $316). 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 October 28, 2025.

It’s typically best to fly out from Harlingen, Texas to Seattle in the morning. Doing so could potentially save you 28% 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 October 28, 2025.
Read through reviews of airlines operating flights from Harlingen to Seattle, such as Southwest, Delta, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,240 reviews

Boarding

8.1

Crew

8.6

Overall

8.0

Comfort

8.0

Food

7.0

Entertainment

7.5

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
4,240 reviews
Southwest
8.0
Very good
4,240 reviews

Boarding

8.1

Crew

8.6

Overall

8.0

Comfort

8.0

Food

7.0

Entertainment

7.5

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
Delta
7.9
Good
7,994 reviews
Southwest
8.0
Very good
4,240 reviews

Boarding

8.1

Crew

8.6

Overall

8.0

Comfort

8.0

Food

7.0

Entertainment

7.5

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
9,001 reviews
Southwest
8.0
Very good
4,240 reviews

Boarding

8.1

Crew

8.6

Overall

8.0

Comfort

8.0

Food

7.0

Entertainment

7.5

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
11,032 reviews
Southwest
8.0
Very good
4,240 reviews

Boarding

8.1

Crew

8.6

Overall

8.0

Comfort

8.0

Food

7.0

Entertainment

7.5

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 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 American Airlines and Southwest fly from Harlingen, Texas to Seattle in about 7h 02m. The time it takes to get you to your destination can typically vary by up to 5h 58m. There are 1984 mi between Harlingen, Texas and Seattle. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    Delta, at $187, 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. Delta is currently priced 56% 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, April is the cheapest month in which you can book a flight from Harlingen, Texas to Seattle (average of $196). Flying from Harlingen, Texas to Seattle in December is currently the most expensive (average of $316). 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
Tukwila
Tacoma
Lakewood
Olympia
Ocean Shores
Lynnwood
Edmonds
Leavenworth
Renton
Kirkland
Lacey
Kent
Federal Way
Cle Elum
Marysville
Puyallup
Chehalis
Fife
Issaquah

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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 October 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$187Average$297FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$271Average$437FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$278Average$472FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$328Average$603FlexibilityNo cancel feeOn-time63%

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