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$208+ 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 12/11. Fares are subject to change and may not be available on all flights or dates of travel.
HRL — SEA
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
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 September 11, 2025.

Round-trip from

$208
(American Airlines)

Popular in

September

Cheapest in

February

Average price

$632
From Harlingen Valley Intl to Seattle/Tacoma Intl
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Highest demand for flights based on searches. 5% potential increase in price ($26 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($19 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 11, 2025.

This American Airlines deal was found by Cheapflights users on 9/10. 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.
Thu 12/116:10 pmHRL - SEA
1 stop8h 45mAmerican Airlines
Sat 12/137:15 amSEA - HRL
1 stop8h 24mAmerican Airlines
Deal found 9/10$208
This American Airlines deal was found by Cheapflights users on 9/9. 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 11/185:40 amHRL - SEA
1 stop7h 04mAmerican Airlines
Sun 11/235:24 amSEA - HRL
1 stop8h 12mAmerican Airlines
Deal found 9/9$243
This United Airlines deal was found by Cheapflights users on 9/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/115:00 pmHRL - SEA
1 stop7h 47mUnited Airlines
Sat 12/137:29 pmSEA - HRL
2 stops13h 35mUnited Airlines
Deal found 9/10$253
This American Airlines deal was found by Cheapflights users on 9/11. 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 11/258:02 pmHRL - SEA
1 stop6h 56mAmerican Airlines
Wed 12/35:18 amSEA - HRL
1 stop8h 11mAmerican Airlines
Deal found 9/11$268
This United Airlines deal was found by Cheapflights users on 9/9. 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 11/1812:10 pmHRL - SEA
2 stops10h 41mUnited Airlines
Sun 11/2311:59 pmSEA - HRL
1 stop9h 00mUnited Airlines
Deal found 9/9$292
This American Airlines deal was found by Cheapflights users on 9/9. 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.
Mon 10/206:20 pmHRL - SEA
1 stop6h 39mAmerican Airlines
Tue 10/2111:24 pmSEA - HRL
1 stop8h 14mAmerican Airlines
Deal found 9/9$295
This American Airlines deal was found by Cheapflights users on 9/9. 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 10/75:25 amHRL - SEA
1 stop7h 29mAmerican Airlines
Tue 10/146:30 amSEA - HRL
2 stops9h 35mAmerican Airlines
Deal found 9/9$323
This Southwest deal was found by Cheapflights users on 9/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/117:30 amHRL - SEA
2 stops13h 10mSouthwest
Sat 12/1310:15 amSEA - HRL
2 stops9h 05mSouthwest
Deal found 9/10$345
This United Airlines deal was found by Cheapflights users on 9/9. 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 10/72:05 pmHRL - SEA
2 stops9h 48mUnited Airlines
Tue 10/146:35 amSEA - HRL
2 stops11h 06mUnited Airlines
Deal found 9/9$375

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 September 11, 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

Thu 12/11

6:10 pm-12:55 am

1 stop8h 45m

Seattle/Tacoma Intl

Sat 12/13

7:15 am-5:39 pm

1 stop8h 24m

$208

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Tue 11/18

5:40 am-10:44 am

1 stop7h 04m

Seattle/Tacoma Intl

Sun 11/23

5:24 am-3:36 pm

1 stop8h 12m

$243

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Thu 12/11

5:00 pm-10:47 pm

1 stop7h 47m

Seattle/Tacoma Intl

Sat 12/13

7:29 pm-11:04 am

2 stops13h 35m

$253

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Sat 1/17

5:48 am-10:41 am

1 stop6h 53m

Seattle/Tacoma Intl

Tue 1/20

5:41 am-4:17 pm

1 stop8h 36m

$259

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Tue 11/25

8:02 pm-12:58 am

1 stop6h 56m

Seattle/Tacoma Intl

Wed 12/3

5:18 am-3:29 pm

1 stop8h 11m

$268

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Thu 12/11

7:30 am-6:40 pm

2 stops13h 10m

Seattle/Tacoma Intl

Sat 12/13

10:15 am-9:20 pm

2 stops9h 05m

$345

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Mon 10/20

6:20 pm-10:59 pm

1 stop6h 39m

Seattle/Tacoma Intl

Tue 10/21

6:30 am-6:05 pm

2 stops9h 35m

$364

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Wed 11/19

12:10 pm-11:15 pm

2 stops13h 05m

Seattle/Tacoma Intl

Sun 11/23

11:59 pm-10:59 am

1 stop9h 00m

$390

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

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, January is the cheapest month in which you can book a flight from Harlingen, Texas to Seattle (average of $238). Flying from Harlingen, Texas to Seattle in June is currently the most expensive (average of $388). 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 September 11, 2025.

It’s typically best to fly out from Harlingen, Texas to Seattle in the morning. Doing so could potentially save you 29% on the flight price compared to flying at noon, which is usually more expensive.

How much does it cost to fly round-trip from Harlingen, Texas to Seattle?

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 September 11, 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
4,248 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

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
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

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
8.0
Very good
7,960 reviews
Southwest
8.0
Very good
4,248 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

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
8,937 reviews
Southwest
8.0
Very good
4,248 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

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
4,248 reviews

Food

7.0

Boarding

8.1

Overall

8.0

Entertainment

7.5

Crew

8.6

Comfort

8.0

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 United Airlines fly from Harlingen, Texas to Seattle in about 7h 47m. The time it takes to get you to your destination can typically vary by up to 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, January is the cheapest month in which you can book a flight from Harlingen, Texas to Seattle (average of $238). Flying from Harlingen, Texas to Seattle in June is currently the most expensive (average of $388). 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
Ocean Shores
Lynnwood
Edmonds
Leavenworth
Lacey
Renton
Olympia
Kent
Federal Way
Cle Elum
Puyallup
Chehalis
Kirkland
Issaquah
Aberdeen
Shoreline

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Alternative routes for Harlingen to Seattle

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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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$187Average$297FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$251Average$427FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$278Average$495FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$328Average$603FlexibilityNo cancel feeOn-time63%

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