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Cheap flights from Harlingen to Seattle from $189

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 to Seattle departing on 6/10. 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 to Seattle

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
8:04 pm - 12:59 am
HRL
-
SEA
6h 55m
1 stop
American Airlines Logo
5:10 am - 4:25 pm
SEA
-
HRL
9h 15m
1 stop
$383American Airlines
Wed, Jun 3 - Tue, Jun 9
Southwest Logo
11:55 am - 9:45 pm
HRL
-
SEA
11h 50m
1 stop
Southwest Logo
12:35 pm - 8:30 pm
SEA
-
HRL
5h 55m
1 stop
$384Southwest
Thu, Sep 3 - Mon, Sep 14
Southwest Logo
11:55 am - 9:45 pm
HRL
-
SEA
11h 50m
1 stop
Southwest Logo
5:30 am - 4:05 pm
SEA
-
HRL
8h 35m
2 stops
$390Southwest
Thu, Sep 3 - Mon, Sep 14
Southwest Logo
5:40 pm - 1:40 am
HRL
-
SEA
10h 00m
2 stops
Southwest Logo
8:50 am - 11:00 pm
SEA
-
HRL
12h 10m
1 stop
$393Southwest
Thu, Jun 4 - Tue, Jun 30
Southwest Logo
5:00 pm - 12:40 am
HRL
-
SEA
9h 40m
2 stops
Southwest Logo
5:15 am - 5:00 pm
SEA
-
HRL
9h 45m
2 stops
$402Southwest
Wed, Jun 10 - Fri, Jul 31
American Airlines Logo
8:04 pm - 12:59 am
HRL
-
SEA
6h 55m
1 stop
American Airlines Logo
12:49 am - 10:13 am
SEA
-
HRL
7h 24m
1 stop
$403American Airlines
Fri, May 29 - Thu, Jun 4
Southwest Logo
5:55 pm - 12:40 am
HRL
-
SEA
8h 45m
2 stops
Southwest Logo
5:30 am - 4:05 pm
SEA
-
HRL
8h 35m
2 stops
$413Southwest
Thu, Sep 3 - Mon, Sep 14
Southwest Logo
6:00 pm - 12:55 am
HRL
-
SEA
8h 55m
2 stops
Southwest Logo
11:05 am - 11:40 pm
SEA
-
HRL
10h 35m
1 stop
$415Southwest
Fri, May 29 - Fri, Jun 5
Southwest Logo
5:40 pm - 1:40 am
HRL
-
SEA
10h 00m
2 stops
Southwest Logo
5:15 am - 6:00 pm
SEA
-
HRL
10h 45m
2 stops
$427Southwest
Thu, Jun 4 - Tue, Jun 30
Southwest Logo
4:40 pm - 11:55 pm
HRL
-
SEA
9h 15m
2 stops
Southwest Logo
9:00 am - 9:35 pm
SEA
-
HRL
10h 35m
2 stops
$444Southwest
Tue, May 12 - Sat, May 16

Southwest flights from Harlingen to Seattle

Our best Southwest deals on Harlingen to Seattle flight tickets
Southwest
Sep 3
HRL11:55 amHarlingen Valley Intl
11h 50m
1 stop
SEA9:45 pmSeattle/Tacoma Intl
Sep 14
SEA12:35 pmSeattle/Tacoma Intl
5h 55m
1 stop
HRL8:30 pmHarlingen Valley Intl
$384
Southwest
Sep 3
HRL11:55 amHarlingen Valley Intl
11h 50m
1 stop
SEA9:45 pmSeattle/Tacoma Intl
Sep 14
SEA5:30 amSeattle/Tacoma Intl
8h 35m
2 stops
HRL4:05 pmHarlingen Valley Intl
$390
Southwest
Jun 4
HRL5:40 pmHarlingen Valley Intl
10h 00m
2 stops
SEA1:40 amSeattle/Tacoma Intl
Jun 30
SEA8:50 amSeattle/Tacoma Intl
12h 10m
1 stop
HRL11:00 pmHarlingen Valley Intl
$393

American Airlines flights from Harlingen to Seattle

Our best American Airlines deals on Harlingen to Seattle flight tickets
American Airlines
Jun 3
HRL8:04 pmHarlingen Valley Intl
6h 55m
1 stop
SEA12:59 amSeattle/Tacoma Intl
Jun 9
SEA5:10 amSeattle/Tacoma Intl
9h 15m
1 stop
HRL4:25 pmHarlingen Valley Intl
$344
American Airlines
Jun 3
HRL8:04 pmHarlingen Valley Intl
6h 55m
1 stop
SEA12:59 amSeattle/Tacoma Intl
Jun 9
SEA5:10 amSeattle/Tacoma Intl
9h 15m
1 stop
HRL4:25 pmHarlingen Valley Intl
$383
American Airlines
May 5
HRL6:00 amHarlingen Valley Intl
6h 48m
1 stop
SEA10:48 amSeattle/Tacoma Intl
May 9
SEA10:25 amSeattle/Tacoma Intl
7h 08m
1 stop
HRL7:33 pmHarlingen Valley Intl
$395

momondo 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, momondo users made 832,500 searches. Data last updated April 29, 2026.
Use the filters below to find and compare flights from Harlingen 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

Wed 6/3

8:04 pm-12:59 am

1 stop6h 55m

Seattle/Tacoma Intl

Tue 6/9

5:10 am-4:25 pm

1 stop9h 15m

$383

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Thu 9/3

11:55 am-9:45 pm

1 stop11h 50m

Seattle/Tacoma Intl

Mon 9/14

12:35 pm-8:30 pm

1 stop5h 55m

$384

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Thu 9/3

11:55 am-9:45 pm

1 stop11h 50m

Seattle/Tacoma Intl

Mon 9/14

5:30 am-4:05 pm

2 stops8h 35m

$390

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Thu 6/4

5:40 pm-1:40 am

2 stops10h 00m

Seattle/Tacoma Intl

Tue 6/30

8:50 am-11:00 pm

1 stop12h 10m

$393

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Wed 6/10

5:00 pm-12:40 am

2 stops9h 40m

Seattle/Tacoma Intl

Fri 7/31

5:15 am-5:00 pm

2 stops9h 45m

$402
Quickest round-trip

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Fri 5/29

8:04 pm-12:59 am

1 stop6h 55m

Seattle/Tacoma Intl

Thu 6/4

12:49 am-10:13 am

1 stop7h 24m

$403

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Thu 9/3

5:55 pm-12:40 am

2 stops8h 45m

Seattle/Tacoma Intl

Mon 9/14

5:30 am-4:05 pm

2 stops8h 35m

$413

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Fri 5/29

6:00 pm-12:55 am

2 stops8h 55m

Seattle/Tacoma Intl

Fri 6/5

11:05 am-11:40 pm

1 stop10h 35m

$415

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Thu 6/4

5:40 pm-1:40 am

2 stops10h 00m

Seattle/Tacoma Intl

Tue 6/30

5:15 am-6:00 pm

2 stops10h 45m

$427

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Tue 5/12

4:40 pm-11:55 pm

2 stops9h 15m

Seattle/Tacoma Intl

Sat 5/16

9:00 am-9:35 pm

2 stops10h 35m

$444

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 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 typical price of a round-trip flight between Harlingen and Seattle?

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 $250. If you don’t want to visit Seattle in February, then you should wait until August to fly from Harlingen, when ticket prices are also cheap, with an average price of $278.

Can stopping save me money on Harlingen to Seattle flights?

You could potentially save up to 61% 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 April 2026, prices for Harlingen to Seattle flights are approximately 16% cheaper 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

Fastest flight time

7h 45m

Direct flights

None
The fastest flight from Harlingen to Seattle takes 7h 45m
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 7h 45m.

  • 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 $215Free CancellationRating
7.1
11,678 reviews
Search American Airlines flights
SouthwestPriceFrom $222Free CancellationRating
8.0
4,314 reviews
Search Southwest flights
United AirlinesPriceFrom $250Free CancellationRating
7.4
9,680 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
Redmond
Kent
Marysville
Puyallup
Tukwila
Lakewood
Cle Elum
Federal Way
Centralia
Fife
Shoreline
Westport
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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