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Cheap flights from Harlingen to Seattle from $174

1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Harlingen to Seattle

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
2:50 pm - 10:35 pmHRL  Harlingen Valley Intl-SEA Seattle/Tacoma Intl
9h 45m1 stop Dallas/Fort Worth
American Airlines Logo
2:17 pm - 10:54 pmSEA  Seattle/Tacoma Intl-HRL Harlingen Valley Intl
6h 37m1 stop Dallas/Fort Worth
$362American Airlines
Wed, Jan 20 - Mon, Jan 25
United Airlines Logo
2:00 pm - 7:32 pmHRL  Harlingen Valley Intl-SEA Seattle/Tacoma Intl
7h 32m1 stop Houston George Bush Intcntl
United Airlines Logo
11:59 pm - 11:14 amSEA  Seattle/Tacoma Intl-HRL Harlingen Valley Intl
9h 15m1 stop Houston George Bush Intcntl
$362United Airlines
Sat, Dec 12 - Mon, Dec 14
United Airlines Logo
12:00 pm - 7:32 pmHRL  Harlingen Valley Intl-SEA Seattle/Tacoma Intl
9h 32m1 stop Houston George Bush Intcntl
United Airlines Logo
7:30 pm - 11:14 amSEA  Seattle/Tacoma Intl-HRL Harlingen Valley Intl
13h 44m2 stops San Francisco Houston George Bush Intcntl
$367United Airlines
Sat, Dec 12 - Mon, Dec 14
American Airlines Logo
2:47 pm - 9:23 pmHRL  Harlingen Valley Intl-SEA Seattle/Tacoma Intl
8h 36m1 stop Dallas/Fort Worth
American Airlines Logo
5:44 am - 2:17 pmSEA  Seattle/Tacoma Intl-HRL Harlingen Valley Intl
6h 33m1 stop Dallas/Fort Worth
$368American Airlines
Thu, May 13 - Tue, May 18
American Airlines Logo
2:50 pm - 10:35 pmHRL  Harlingen Valley Intl-SEA Seattle/Tacoma Intl
9h 45m1 stop Dallas/Fort Worth
American Airlines Logo
2:17 pm - 10:54 pmSEA  Seattle/Tacoma Intl-HRL Harlingen Valley Intl
6h 37m1 stop Dallas/Fort Worth
$368American Airlines
Wed, Jan 20 - Mon, Jan 25
United Airlines Logo
2:00 pm - 9:21 pmHRL  Harlingen Valley Intl-SEA Seattle/Tacoma Intl
9h 21m2 stops Houston George Bush Intcntl Denver Intl
United Airlines Logo
7:30 pm - 11:14 amSEA  Seattle/Tacoma Intl-HRL Harlingen Valley Intl
13h 44m2 stops San Francisco Houston George Bush Intcntl
$372United Airlines
Sat, Dec 12 - Mon, Dec 14
American Airlines Logo
10:44 am - 4:56 pmHRL  Harlingen Valley Intl-SEA Seattle/Tacoma Intl
8h 12m1 stop Dallas/Fort Worth
American Airlines Logo
2:07 pm - 11:26 pmSEA  Seattle/Tacoma Intl-HRL Harlingen Valley Intl
7h 19m1 stop Dallas/Fort Worth
$392American Airlines
Tue, Dec 8 - Sat, Dec 12
Southwest Logo
12:45 pm - 9:50 pmHRL  Harlingen Valley Intl-SEA Seattle/Tacoma Intl
11h 05m2 stops Houston Hobby Denver Intl
Southwest Logo
10:45 am - 9:30 pmSEA  Seattle/Tacoma Intl-HRL Harlingen Valley Intl
8h 45m2 stops Phoenix Sky Harbor Intl Austin Bergstrom
$397Southwest
Sat, Dec 12 - Thu, Dec 17
Southwest Logo
10:50 am - 7:00 pmHRL  Harlingen Valley Intl-SEA Seattle/Tacoma Intl
10h 10m2 stops Houston Hobby Phoenix Sky Harbor Intl
Southwest Logo
5:00 am - 4:20 pmSEA  Seattle/Tacoma Intl-HRL Harlingen Valley Intl
9h 20m2 stops Las Vegas Harry Reid Intl Houston Hobby
$398Southwest
Thu, May 13 - Tue, May 18
Southwest Logo
2:55 pm - 9:50 pmHRL  Harlingen Valley Intl-SEA Seattle/Tacoma Intl
8h 55m2 stops Dallas Love Field Denver Intl
Southwest Logo
1:55 pm - 11:35 pmSEA  Seattle/Tacoma Intl-HRL Harlingen Valley Intl
7h 40m2 stops Denver Intl Houston Hobby
$398Southwest
Sat, Dec 12 - Sun, Dec 13

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Southwest flights from Harlingen to Seattle

Our best Southwest deals on Harlingen to Seattle flight tickets
Southwest
Dec 12
HRL12:45 pmHarlingen Valley Intl
11h 05m
2 stops
SEA9:50 pmSeattle/Tacoma Intl
Dec 17
SEA10:45 amSeattle/Tacoma Intl
8h 45m
2 stops
HRL9:30 pmHarlingen Valley Intl
$397
Southwest
Dec 12
HRL2:55 pmHarlingen Valley Intl
8h 55m
2 stops
SEA9:50 pmSeattle/Tacoma Intl
Dec 13
SEA1:55 pmSeattle/Tacoma Intl
7h 40m
2 stops
HRL11:35 pmHarlingen Valley Intl
$398
Southwest
Dec 13
HRL4:45 pmHarlingen Valley Intl
10h 00m
2 stops
SEA12:45 amSeattle/Tacoma Intl
Dec 17
SEA10:45 amSeattle/Tacoma Intl
8h 45m
2 stops
HRL9:30 pmHarlingen Valley Intl
$418

United Airlines flights from Harlingen to Seattle

Our best United Airlines deals on Harlingen to Seattle flight tickets
United Airlines
Dec 12
HRL2:00 pmHarlingen Valley Intl
7h 32m
1 stop
SEA7:32 pmSeattle/Tacoma Intl
Dec 14
SEA11:59 pmSeattle/Tacoma Intl
9h 15m
1 stop
HRL11:14 amHarlingen Valley Intl
$362
United Airlines
Dec 12
HRL12:00 pmHarlingen Valley Intl
9h 32m
1 stop
SEA7:32 pmSeattle/Tacoma Intl
Dec 14
SEA7:30 pmSeattle/Tacoma Intl
13h 44m
2 stops
HRL11:14 amHarlingen Valley Intl
$367
United Airlines
Dec 12
HRL2:00 pmHarlingen Valley Intl
9h 21m
2 stops
SEA9:21 pmSeattle/Tacoma Intl
Dec 14
SEA7:30 pmSeattle/Tacoma Intl
13h 44m
2 stops
HRL11:14 amHarlingen Valley Intl
$372

momondo Fare Finder

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

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Route

Depart

Return

Price

Cheapest round-trip

HarlingenSeattle

HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl

HRLSEA

Harlingen Valley Intl

Wed 1/20

2:50 pm-10:35 pm

1 stop9h 45m

Seattle/Tacoma Intl

Mon 1/25

2:17 pm-10:54 pm

1 stop6h 37m

$362

HarlingenSeattle

HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl

HRLSEA

Harlingen Valley Intl

Sat 12/12

2:00 pm-7:32 pm

1 stop7h 32m

Seattle/Tacoma Intl

Mon 12/14

11:59 pm-11:14 am

1 stop9h 15m

$362

HarlingenSeattle

HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl

HRLSEA

Harlingen Valley Intl

Sat 12/12

12:00 pm-7:32 pm

1 stop9h 32m

Seattle/Tacoma Intl

Mon 12/14

7:30 pm-11:14 am

2 stops13h 44m

$367
Quickest round-trip

HarlingenSeattle

HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl

HRLSEA

Harlingen Valley Intl

Thu 5/13

2:47 pm-9:23 pm

1 stop8h 36m

Seattle/Tacoma Intl

Tue 5/18

5:44 am-2:17 pm

1 stop6h 33m

$368

HarlingenSeattle

HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl

HRLSEA

Harlingen Valley Intl

Wed 1/20

2:50 pm-10:35 pm

1 stop9h 45m

Seattle/Tacoma Intl

Mon 1/25

2:17 pm-10:54 pm

1 stop6h 37m

$368

HarlingenSeattle

HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl

HRLSEA

Harlingen Valley Intl

Sat 12/12

2:00 pm-9:21 pm

2 stops9h 21m

Seattle/Tacoma Intl

Mon 12/14

7:30 pm-11:14 am

2 stops13h 44m

$372

HarlingenSeattle

HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl

HRLSEA

Harlingen Valley Intl

Tue 12/8

10:44 am-4:56 pm

1 stop8h 12m

Seattle/Tacoma Intl

Sat 12/12

2:07 pm-11:26 pm

1 stop7h 19m

$392

HarlingenSeattle

HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl

HRLSEA

Harlingen Valley Intl

Sat 12/12

12:45 pm-9:50 pm

2 stops11h 05m

Seattle/Tacoma Intl

Thu 12/17

10:45 am-9:30 pm

2 stops8h 45m

$397

HarlingenSeattle

HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl

HRLSEA

Harlingen Valley Intl

Thu 5/13

10:50 am-7:00 pm

2 stops10h 10m

Seattle/Tacoma Intl

Tue 5/18

5:00 am-4:20 pm

2 stops9h 20m

$398

HarlingenSeattle

HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl

HRLSEA

Harlingen Valley Intl

Sat 12/12

2:55 pm-9:50 pm

2 stops8h 55m

Seattle/Tacoma Intl

Sun 12/13

1:55 pm-11:35 pm

2 stops7h 40m

$398

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 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 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 April to fly from Harlingen, when ticket prices are also cheap, with an average price of $288.

Can stopping save me money on Harlingen to Seattle flights?

You could potentially save up to 36% on your flight if you consider stops on a Harlingen to Seattle flight.

How have Harlingen to Seattle flight prices changed over time?

As of November 2026, prices for Harlingen to Seattle flights are approximately 3% more expensive when compared to flights at the same time last year.

When to book flights from Harlingen to Seattle

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

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

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

Best Price Found

$174

Fastest flight time

8h 12m

Direct flights

None
The best one-way flight to Seattle from Harlingen in the past 72 hours is $174. The best round-trip flight deal from Harlingen to Seattle found on momondo in the last 72 hours is $362.
The fastest flight from Harlingen to Seattle takes 8h 12m
There are no direct flights from Harlingen to Seattle. There are no popular flight routes from Harlingen to Seattle.
Search flight deals

Frequently asked questions about flying from Harlingen to Seattle

  • 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 12m.

  • 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 to Seattle?

Best airlines flying from Harlingen to Seattle

Compare and see reviews for airlines that fly from Harlingen to Seattle with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $225Free CancellationRating
7.0
12,234 reviews
Search American Airlines flights
SouthwestPriceFrom $297Free CancellationRating
8.0
4,222 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
Kent
Olympia
Federal Way
Redmond
Lakewood
Lynnwood
Tukwila
Fife
Puyallup
Cle Elum
Marysville
Lacey
Kirkland
Centralia
Bothell

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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