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Cheap flights from Harlingen, Texas to Seattle from $155

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 3/24. 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.
American Airlines Logo
7:53 pm - 12:44 am
HRL
-
SEA
6h 51m
1 stop
American Airlines Logo
11:55 pm - 10:17 am
SEA
-
HRL
8h 22m
1 stop
$237American Airlines
Thu, Apr 23 - Mon, Apr 27
Southwest Logo
7:35 am - 5:50 pm
HRL
-
SEA
12h 15m
2 stops
Southwest Logo
9:00 am - 9:25 pm
SEA
-
HRL
10h 25m
2 stops
$287Southwest
Tue, Mar 3 - Tue, Mar 10
American Airlines Logo
8:06 pm - 12:55 am
HRL
-
SEA
6h 49m
1 stop
American Airlines Logo
12:59 am - 10:12 am
SEA
-
HRL
7h 13m
1 stop
$289American Airlines
Thu, Feb 26 - Wed, Mar 4
American Airlines Logo
8:06 pm - 12:55 am
HRL
-
SEA
6h 49m
1 stop
American Airlines Logo
5:30 am - 2:05 pm
SEA
-
HRL
6h 35m
1 stop
$317American Airlines
Thu, Mar 5 - Tue, Mar 10
American Airlines Logo
8:06 pm - 12:55 am
HRL
-
SEA
6h 49m
1 stop
American Airlines Logo
12:59 am - 10:12 am
SEA
-
HRL
7h 13m
1 stop
$327American Airlines
Thu, Mar 5 - Sun, Mar 8
United Airlines Logo
9:20 am - 9:01 pm
HRL
-
SEA
13h 41m
2 stops
United Airlines Logo
11:59 pm - 11:16 am
SEA
-
HRL
9h 17m
1 stop
$332United Airlines
Tue, Mar 3 - Wed, Mar 11
United Airlines Logo
5:18 pm - 10:50 pm
HRL
-
SEA
7h 32m
1 stop
United Airlines Logo
7:37 pm - 11:23 am
SEA
-
HRL
13h 46m
2 stops
$334United Airlines
Thu, Apr 23 - Mon, Apr 27
United Airlines Logo
9:20 am - 9:01 pm
HRL
-
SEA
13h 41m
2 stops
United Airlines Logo
7:35 pm - 11:16 am
SEA
-
HRL
13h 41m
2 stops
$337United Airlines
Tue, Mar 3 - Mon, Mar 9
United Airlines Logo
9:20 am - 9:01 pm
HRL
-
SEA
13h 41m
2 stops
United Airlines Logo
7:35 pm - 11:16 am
SEA
-
HRL
13h 41m
2 stops
$338United Airlines
Tue, Mar 3 - Mon, Mar 9
Southwest Logo
6:30 am - 4:00 pm
HRL
-
SEA
11h 30m
2 stops
Southwest Logo
5:15 am - 5:05 pm
SEA
-
HRL
9h 50m
2 stops
$343Southwest
Wed, Feb 25 - Wed, Mar 4

American Airlines flights from Harlingen, Texas to Seattle

Our best American Airlines deals on Harlingen, Texas to Seattle flight tickets
American Airlines
Apr 23
HRL7:53 pmHarlingen Valley Intl
6h 51m
1 stop
SEA12:44 amSeattle/Tacoma Intl
Apr 27
SEA11:55 pmSeattle/Tacoma Intl
8h 22m
1 stop
HRL10:17 amHarlingen Valley Intl
$237
American Airlines
Feb 26
HRL8:06 pmHarlingen Valley Intl
6h 49m
1 stop
SEA12:55 amSeattle/Tacoma Intl
Mar 4
SEA12:59 amSeattle/Tacoma Intl
7h 13m
1 stop
HRL10:12 amHarlingen Valley Intl
$289
American Airlines
Mar 5
HRL8:06 pmHarlingen Valley Intl
6h 49m
1 stop
SEA12:55 amSeattle/Tacoma Intl
Mar 10
SEA5:30 amSeattle/Tacoma Intl
6h 35m
1 stop
HRL2:05 pmHarlingen Valley Intl
$317

United Airlines flights from Harlingen, Texas to Seattle

Our best United Airlines deals on Harlingen, Texas to Seattle flight tickets
United Airlines
Mar 3
HRL9:20 amHarlingen Valley Intl
13h 41m
2 stops
SEA9:01 pmSeattle/Tacoma Intl
Mar 9
SEA11:59 pmSeattle/Tacoma Intl
9h 17m
1 stop
HRL11:16 amHarlingen Valley Intl
$332
United Airlines
Apr 23
HRL5:18 pmHarlingen Valley Intl
7h 32m
1 stop
SEA10:50 pmSeattle/Tacoma Intl
Apr 27
SEA7:37 pmSeattle/Tacoma Intl
13h 46m
2 stops
HRL11:23 amHarlingen Valley Intl
$334
United Airlines
Mar 3
HRL9:20 amHarlingen Valley Intl
13h 41m
2 stops
SEA9:01 pmSeattle/Tacoma Intl
Mar 9
SEA7:35 pmSeattle/Tacoma Intl
13h 41m
2 stops
HRL11:16 amHarlingen Valley Intl
$337

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 January 29, 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

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Thu 4/23

7:53 pm-12:44 am

1 stop6h 51m

Seattle/Tacoma Intl

Mon 4/27

11:55 pm-10:17 am

1 stop8h 22m

$237

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Tue 3/3

7:35 am-5:50 pm

2 stops12h 15m

Seattle/Tacoma Intl

Tue 3/10

9:00 am-9:25 pm

2 stops10h 25m

$287

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Thu 2/26

8:06 pm-12:55 am

1 stop6h 49m

Seattle/Tacoma Intl

Wed 3/4

12:59 am-10:12 am

1 stop7h 13m

$289

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Thu 3/5

8:06 pm-12:55 am

1 stop6h 49m

Seattle/Tacoma Intl

Tue 3/10

5:30 am-2:05 pm

1 stop6h 35m

$317

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Thu 3/5

8:06 pm-12:55 am

1 stop6h 49m

Seattle/Tacoma Intl

Sun 3/8

12:59 am-10:12 am

1 stop7h 13m

$327

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Tue 3/3

9:20 am-9:01 pm

2 stops13h 41m

Seattle/Tacoma Intl

Wed 3/11

11:59 pm-11:16 am

1 stop9h 17m

$332

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Thu 4/23

5:18 pm-10:50 pm

1 stop7h 32m

Seattle/Tacoma Intl

Mon 4/27

7:37 pm-11:23 am

2 stops13h 46m

$334

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Tue 3/3

9:20 am-9:01 pm

2 stops13h 41m

Seattle/Tacoma Intl

Mon 3/9

7:35 pm-11:16 am

2 stops13h 41m

$337

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Tue 3/3

9:20 am-9:01 pm

2 stops13h 41m

Seattle/Tacoma Intl

Mon 3/9

7:35 pm-11:16 am

2 stops13h 41m

$338

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Wed 2/25

6:30 am-4:00 pm

2 stops11h 30m

Seattle/Tacoma Intl

Wed 3/4

5:15 am-5:05 pm

2 stops9h 50m

$343

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 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 $263. 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 67% 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 January 2026, prices for Harlingen, Texas to Seattle flights are approximately 53% 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

7h 32m

Direct flights

None
The fastest flight from Harlingen, Texas to Seattle takes 7h 32m
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 7h 32m.

  • 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
DeltaPriceFrom $149Free CancellationRating
7.9
8,128 reviews
Search Delta flights
American AirlinesPriceFrom $215Free CancellationRating
7.2
11,205 reviews
Search American Airlines flights
United AirlinesPriceFrom $278Free CancellationRating
7.4
9,215 reviews
Search United Airlines flights
SouthwestPriceFrom $328Free CancellationRating
8.0
4,267 reviews
Search Southwest 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
Marysville
Puyallup
Redmond
Cle Elum
Tukwila
Lakewood
Federal Way
Centralia
Westport
Kirkland
Fife
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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