Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Harlingen to Seattle from $154

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 8/15. 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
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.
Southwest Logo
7:00 am - 4:50 pm
HRL
-
SEA
11h 50m
1 stop
Southwest Logo
7:10 am - 8:10 pm
SEA
-
HRL
11h 00m
2 stops
$318Southwest
Sat, Aug 22 - Tue, Aug 25
American Airlines Logo
8:04 pm - 12:58 am
HRL
-
SEA
6h 54m
1 stop
American Airlines Logo
11:59 pm - 9:43 am
SEA
-
HRL
7h 44m
1 stop
$337American Airlines
Mon, Nov 2 - Sat, Nov 7
Southwest Logo
6:05 am - 12:55 pm
HRL
-
SEA
8h 50m
2 stops
Southwest Logo
7:10 am - 8:10 pm
SEA
-
HRL
11h 00m
2 stops
$338Southwest
Sat, Aug 22 - Tue, Aug 25
Southwest Logo
7:00 am - 4:50 pm
HRL
-
SEA
11h 50m
1 stop
Southwest Logo
8:55 am - 9:45 pm
SEA
-
HRL
10h 50m
1 stop
$339Southwest
Sat, Aug 22 - Tue, Aug 25
American Airlines Logo
3:17 pm - 10:19 pm
HRL
-
SEA
9h 02m
1 stop
American Airlines Logo
5:30 am - 3:05 pm
SEA
-
HRL
7h 35m
1 stop
$341American Airlines
Sat, Sep 5 - Sat, Sep 19
Southwest Logo
5:50 pm - 12:40 am
HRL
-
SEA
8h 50m
2 stops
Southwest Logo
9:55 am - 7:40 pm
SEA
-
HRL
7h 45m
1 stop
$342Southwest
Mon, Nov 2 - Sat, Nov 7
Southwest Logo
6:05 am - 2:20 pm
HRL
-
SEA
10h 15m
2 stops
Southwest Logo
5:30 am - 6:50 pm
SEA
-
HRL
11h 20m
2 stops
$353Southwest
Sat, Aug 8 - Sat, Aug 15
American Airlines Logo
3:17 pm - 10:19 pm
HRL
-
SEA
9h 02m
1 stop
American Airlines Logo
5:30 am - 3:05 pm
SEA
-
HRL
7h 35m
1 stop
$356American Airlines
Sat, Sep 5 - Sat, Sep 19
Southwest Logo
7:00 am - 4:50 pm
HRL
-
SEA
11h 50m
1 stop
Southwest Logo
5:30 am - 6:50 pm
SEA
-
HRL
11h 20m
2 stops
$377Southwest
Sat, Aug 8 - Sat, Aug 15
Southwest Logo
5:30 pm - 1:35 am
HRL
-
SEA
10h 05m
2 stops
Southwest Logo
1:50 pm - 10:25 pm
SEA
-
HRL
6h 35m
1 stop
$399Southwest
Thu, Oct 8 - Fri, Oct 16

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Southwest flights from Harlingen to Seattle

Our best Southwest deals on Harlingen to Seattle flight tickets
Southwest
Aug 22
HRL7:00 amHarlingen Valley Intl
11h 50m
1 stop
SEA4:50 pmSeattle/Tacoma Intl
Aug 25
SEA7:10 amSeattle/Tacoma Intl
11h 00m
2 stops
HRL8:10 pmHarlingen Valley Intl
$318
Southwest
Aug 22
HRL6:05 amHarlingen Valley Intl
8h 50m
2 stops
SEA12:55 pmSeattle/Tacoma Intl
Aug 25
SEA7:10 amSeattle/Tacoma Intl
11h 00m
2 stops
HRL8:10 pmHarlingen Valley Intl
$338
Southwest
Aug 22
HRL7:00 amHarlingen Valley Intl
11h 50m
1 stop
SEA4:50 pmSeattle/Tacoma Intl
Aug 25
SEA8:55 amSeattle/Tacoma Intl
10h 50m
1 stop
HRL9:45 pmHarlingen Valley Intl
$339

American Airlines flights from Harlingen to Seattle

Our best American Airlines deals on Harlingen to Seattle flight tickets
American Airlines
Nov 2
HRL8:04 pmHarlingen Valley Intl
6h 54m
1 stop
SEA12:58 amSeattle/Tacoma Intl
Nov 7
SEA11:59 pmSeattle/Tacoma Intl
7h 44m
1 stop
HRL9:43 amHarlingen Valley Intl
$337
American Airlines
Sep 5
HRL3:17 pmHarlingen Valley Intl
9h 02m
1 stop
SEA10:19 pmSeattle/Tacoma Intl
Sep 19
SEA5:30 amSeattle/Tacoma Intl
7h 35m
1 stop
HRL3:05 pmHarlingen Valley Intl
$341
American Airlines
Sep 5
HRL10:34 amHarlingen Valley Intl
11h 36m
2 stops
SEA8:10 pmSeattle/Tacoma Intl
Sep 19
SEA5:30 amSeattle/Tacoma Intl
7h 35m
1 stop
HRL3:05 pmHarlingen Valley Intl
$447

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 June 17, 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

Sat 8/22

7:00 am-4:50 pm

1 stop11h 50m

Seattle/Tacoma Intl

Tue 8/25

7:10 am-8:10 pm

2 stops11h 00m

$318
Quickest round-trip

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Mon 11/2

8:04 pm-12:58 am

1 stop6h 54m

Seattle/Tacoma Intl

Sat 11/7

11:59 pm-9:43 am

1 stop7h 44m

$337

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Sat 8/22

6:05 am-12:55 pm

2 stops8h 50m

Seattle/Tacoma Intl

Tue 8/25

7:10 am-8:10 pm

2 stops11h 00m

$338

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Sat 8/22

7:00 am-4:50 pm

1 stop11h 50m

Seattle/Tacoma Intl

Tue 8/25

8:55 am-9:45 pm

1 stop10h 50m

$339

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Sat 9/5

3:17 pm-10:19 pm

1 stop9h 02m

Seattle/Tacoma Intl

Sat 9/19

5:30 am-3:05 pm

1 stop7h 35m

$341

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Mon 11/2

5:50 pm-12:40 am

2 stops8h 50m

Seattle/Tacoma Intl

Sat 11/7

9:55 am-7:40 pm

1 stop7h 45m

$342

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Sat 8/8

6:05 am-2:20 pm

2 stops10h 15m

Seattle/Tacoma Intl

Sat 8/15

5:30 am-6:50 pm

2 stops11h 20m

$353

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Sat 9/5

3:17 pm-10:19 pm

1 stop9h 02m

Seattle/Tacoma Intl

Sat 9/19

5:30 am-3:05 pm

1 stop7h 35m

$356

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Sat 8/8

7:00 am-4:50 pm

1 stop11h 50m

Seattle/Tacoma Intl

Sat 8/15

5:30 am-6:50 pm

2 stops11h 20m

$377

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Thu 10/8

5:30 pm-1:35 am

2 stops10h 05m

Seattle/Tacoma Intl

Fri 10/16

1:50 pm-10:25 pm

1 stop6h 35m

$399

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 $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 72% 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 June 2026, prices for Harlingen to Seattle flights are approximately 53% 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

6h 25m

Direct flights

None
The fastest flight from Harlingen to Seattle takes 6h 25m
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 6h 25m.

  • 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
11,670 reviews
Search American Airlines flights
United AirlinesPriceFrom $236Free CancellationRating
7.4
9,845 reviews
Search United Airlines flights
SouthwestPriceFrom $297Free CancellationRating
7.9
4,235 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
Redmond
Kent
Lakewood
Puyallup
Tukwila
Federal Way
Fife
Cle Elum
Marysville
Centralia
Shoreline
Kirkland
Westport

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.

An easier way to manage your Seattle trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Fri 7/17
Fri 7/24
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States