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Cheap flights from Harlingen, Texas to Seattle from $180

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Harlingen, Texas to Seattle departing on 5/19. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Harlingen, Texas to Seattle

Cheap round-trip flights

Enter your travel dates to find the best prices.
Southwest Logo
4:40 pm - 11:35 pm
HRL
-
SEA
8h 55m
2 stops
Southwest Logo
9:00 am - 9:35 pm
SEA
-
HRL
10h 35m
2 stops
$218Southwest
Tue, Apr 21 - Sat, Apr 25
American Airlines Logo
10:47 am - 3:51 pm
HRL
-
SEA
7h 04m
1 stop
American Airlines Logo
11:55 pm - 10:17 am
SEA
-
HRL
8h 22m
1 stop
$235American Airlines
Tue, Apr 21 - Sat, Apr 25
United Airlines Logo
7:00 am - 6:35 pm
HRL
-
SEA
13h 35m
2 stops
United Airlines Logo
6:30 am - 4:04 pm
SEA
-
HRL
7h 34m
1 stop
$332United Airlines
Tue, Apr 21 - Sat, Apr 25
United Airlines Logo
12:10 pm - 1:12 am
HRL
-
SEA
15h 02m
2 stops
United Airlines Logo
8:51 am - 9:59 pm
SEA
-
HRL
11h 08m
2 stops
$337United Airlines
Sat, May 2 - Tue, May 5
United Airlines Logo
9:20 am - 11:27 pm
HRL
-
SEA
16h 07m
3 stops
United Airlines Logo
8:45 am - 9:59 pm
SEA
-
HRL
11h 14m
2 stops
$343United Airlines
Tue, Apr 21 - Sat, Apr 25
United Airlines Logo
12:10 pm - 11:29 pm
HRL
-
SEA
13h 19m
2 stops
United Airlines Logo
7:00 am - 4:04 pm
SEA
-
HRL
7h 04m
1 stop
$352United Airlines
Sat, May 2 - Tue, May 5
United Airlines Logo
12:10 pm - 11:29 pm
HRL
-
SEA
13h 19m
2 stops
United Airlines Logo
8:45 am - 9:59 pm
SEA
-
HRL
11h 14m
2 stops
$357United Airlines
Sat, May 2 - Tue, May 5
United Airlines Logo
7:00 am - 6:30 pm
HRL
-
SEA
13h 30m
2 stops
United Airlines Logo
11:59 pm - 11:23 am
SEA
-
HRL
9h 24m
1 stop
$390United Airlines
Sat, May 2 - Tue, May 5
United Airlines Logo
12:10 pm - 1:12 am
HRL
-
SEA
15h 02m
2 stops
United Airlines Logo
11:59 pm - 11:23 am
SEA
-
HRL
9h 24m
1 stop
$392United Airlines
Sat, May 2 - Tue, May 5
United Airlines Logo
12:10 pm - 1:12 am
HRL
-
SEA
15h 02m
2 stops
United Airlines Logo
7:36 pm - 11:23 am
SEA
-
HRL
13h 47m
2 stops
$395United Airlines
Sat, May 2 - Tue, May 5

Southwest flights from Harlingen, Texas to Seattle

Our best Southwest deals on Harlingen, Texas to Seattle flight tickets
Southwest
Jun 1
HRL6:00 pmHarlingen Valley Intl
8h 40m
2 stops
SEA12:40 amSeattle/Tacoma Intl
Jun 5
SEA11:00 amSeattle/Tacoma Intl
10h 40m
1 stop
HRL11:40 pmHarlingen Valley Intl
$419
Southwest
Jul 2
HRL5:40 pmHarlingen Valley Intl
10h 00m
2 stops
SEA1:40 amSeattle/Tacoma Intl
Jul 7
SEA5:15 amSeattle/Tacoma Intl
10h 45m
2 stops
HRL6:00 pmHarlingen Valley Intl
$534
Southwest
Mar 27
HRL5:30 pmHarlingen Valley Intl
10h 10m
2 stops
SEA1:40 amSeattle/Tacoma Intl
Mar 31
SEA9:50 amSeattle/Tacoma Intl
10h 50m
2 stops
HRL10:40 pmHarlingen Valley Intl
$539

American Airlines flights from Harlingen, Texas to Seattle

Our best American Airlines deals on Harlingen, Texas to Seattle flight tickets
American Airlines
Mar 25
HRL8:06 pmHarlingen Valley Intl
6h 49m
1 stop
SEA12:55 amSeattle/Tacoma Intl
Mar 28
SEA12:59 amSeattle/Tacoma Intl
7h 13m
1 stop
HRL10:12 amHarlingen Valley Intl
$404
American Airlines
Apr 10
HRL7:53 pmHarlingen Valley Intl
6h 51m
1 stop
SEA12:44 amSeattle/Tacoma Intl
Apr 13
SEA11:55 pmSeattle/Tacoma Intl
8h 22m
1 stop
HRL10:17 amHarlingen Valley Intl
$434
American Airlines
Mar 27
HRL8:06 pmHarlingen Valley Intl
6h 49m
1 stop
SEA12:55 amSeattle/Tacoma Intl
Mar 31
SEA6:44 amSeattle/Tacoma Intl
9h 32m
1 stop
HRL6:16 pmHarlingen Valley Intl
$439

momondo Fare Finder

 
Customize your flight search to find flights from Harlingen, Texas 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, momondo users made 832,500 searches. Data last updated March 14, 2026.
Use the filters below to find and compare flights from Harlingen, Texas 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

Tue 4/21

4:40 pm-11:35 pm

2 stops8h 55m

Seattle/Tacoma Intl

Sat 4/25

9:00 am-9:35 pm

2 stops10h 35m

$218
Quickest round-trip

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Tue 4/21

10:47 am-3:51 pm

1 stop7h 04m

Seattle/Tacoma Intl

Sat 4/25

11:55 pm-10:17 am

1 stop8h 22m

$235

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Tue 4/21

7:00 am-6:35 pm

2 stops13h 35m

Seattle/Tacoma Intl

Sat 4/25

6:30 am-4:04 pm

1 stop7h 34m

$332

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Sat 5/2

12:10 pm-1:12 am

2 stops15h 02m

Seattle/Tacoma Intl

Tue 5/5

8:51 am-9:59 pm

2 stops11h 08m

$337

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 5/2

12:10 pm-11:29 pm

2 stops13h 19m

Seattle/Tacoma Intl

Tue 5/5

7:00 am-4:04 pm

1 stop7h 04m

$352

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

8:45 am-9:59 pm

2 stops11h 14m

$357

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Sat 5/2

7:00 am-6:30 pm

2 stops13h 30m

Seattle/Tacoma Intl

Tue 5/5

11:59 pm-11:23 am

1 stop9h 24m

$390

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Sat 5/2

12:10 pm-1:12 am

2 stops15h 02m

Seattle/Tacoma Intl

Tue 5/5

11:59 pm-11:23 am

1 stop9h 24m

$392

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Sat 5/2

12:10 pm-1:12 am

2 stops15h 02m

Seattle/Tacoma Intl

Tue 5/5

7:36 pm-11:23 am

2 stops13h 47m

$395

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Seattle from

How to get the cheapest flight ticket from Harlingen, Texas to Seattle

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Seattle?

In general, February is the cheapest month to fly from Harlingen, Texas to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $250. If you don’t want to visit Seattle in February, then you should wait until August to fly from Harlingen, Texas, when ticket prices are also cheap, with an average price of $278.

Can stopping save me money on Harlingen, Texas to Seattle flights?

You could potentially save up to 60% on your flight if you consider stops on a Harlingen, Texas to Seattle flight.

How have Harlingen, Texas to Seattle flight prices changed over time?

As of March 2026, prices for Harlingen, Texas to Seattle flights are approximately 133% more expensive when compared to flights at the same time last year.

When to book flights from Harlingen, Texas to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Harlingen, Texas to Seattle according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Harlingen, Texas to Seattle (HRL to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Harlingen, Texas to Seattle

Fastest flight time

8h 07m

Direct flights

None
The fastest flight from Harlingen, Texas to Seattle takes 8h 07m
There are no direct flights from Harlingen, Texas to Seattle. There are no popular flight routes from Harlingen, Texas to Seattle.
Search flight deals

  • How far is Harlingen Valley Intl to Seattle/Tacoma Intl by plane?

    The distance between Harlingen Valley Intl and Seattle/Tacoma Intl is about 1992.5 mi. In terms of flight time, this usually takes a little over 8h 07m.

  • When did momondo last update prices for flights from Harlingen Valley Intl Airport to Seattle/Tacoma Intl Airport?

    Prices for flights from Harlingen Valley Intl Airport to Seattle/Tacoma Intl Airport were last updated today.

  • How many operators does momondo search for flights from Harlingen Valley Intl Airport to Seattle/Tacoma Intl Airport?

  • How old do you have to be to fly from Harlingen Valley Intl Airport to Seattle/Tacoma Intl Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Harlingen Valley Intl Airport to Seattle/Tacoma Intl Airport.

  • What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

    The travel and health documents required for your trip to Seattle/Tacoma Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Seattle/Tacoma Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from Harlingen, Texas to Seattle?

Best airlines flying from Harlingen, Texas to Seattle

Compare and see reviews for airlines that fly from Harlingen, Texas to Seattle with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $215Free CancellationRating
7.1
11,464 reviews
Search American Airlines flights
SouthwestPriceFrom $222Free CancellationRating
8.0
4,317 reviews
Search Southwest flights
United AirlinesPriceFrom $250Free CancellationRating
7.4
9,423 reviews
Search United Airlines flights

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
Leavenworth
SeaTac
Ocean Shores
Renton
Olympia
Lynnwood
Kent
Redmond
Marysville
Puyallup
Cle Elum
Lakewood
Tukwila
Federal Way
Fife
Westport
Centralia
Kirkland
Tumwater

Why use momondo?

Why should I use momondo to find a flight deal from Harlingen to Seattle?

It is quick and easy to find Harlingen to Seattle flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Seattle that suits you.

Can I find flights from Harlingen to Seattle with flexible booking policies on momondo?

Flights from Harlingen to Seattle with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Harlingen to Seattle?

Once all potential Harlingen to Seattle flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Harlingen to Seattle right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Harlingen to Seattle flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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