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Cheap flights from Harlingen, Texas to Seattle from $210

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 9/30. 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

American Airlines Logo
5:40 am - 10:44 amHRL-SEA
7h 04m1 stop
American Airlines Logo
11:34 am - 10:57 pmSEA-HRL
9h 23m1 stop
$308American Airlines
Find Deal
Thu, Nov 6 - Sun, Nov 9
American Airlines Logo
6:19 pm - 10:59 pmHRL-SEA
6h 40m1 stop
American Airlines Logo
11:24 pm - 9:38 amSEA-HRL
8h 14m1 stop
$339American Airlines
Find Deal
Thu, Oct 2 - Mon, Oct 6
Southwest Logo
12:15 pm - 8:35 pmHRL-SEA
10h 20m2 stops
Southwest Logo
7:10 am - 10:30 pmSEA-HRL
13h 20m2 stops
$360Southwest
Find Deal
Thu, Nov 6 - Sun, Nov 9
American Airlines Logo
6:20 pm - 10:59 pmHRL-SEA
6h 39m1 stop
American Airlines Logo
5:22 am - 2:18 pmSEA-HRL
6h 56m1 stop
$369American Airlines
Find Deal
Mon, Oct 6 - Wed, Oct 8
United Airlines Logo
12:10 pm - 11:15 pmHRL-SEA
13h 05m2 stops
United Airlines Logo
11:59 pm - 10:59 amSEA-HRL
9h 00m1 stop
$392United Airlines
Find Deal
Thu, Nov 6 - Sun, Nov 9
American Airlines Logo
12:13 pm - 7:12 pmHRL-SEA
8h 59m1 stop
American Airlines Logo
12:59 am - 9:40 amSEA-HRL
6h 41m1 stop
$407American Airlines
Find Deal
Sun, Dec 7 - Mon, Dec 29
Southwest Logo
5:45 am - 2:30 pmHRL-SEA
10h 45m2 stops
Southwest Logo
5:00 am - 5:00 pmSEA-HRL
10h 00m2 stops
$414Southwest
Find Deal
Sun, Dec 7 - Tue, Dec 30
Southwest Logo
6:00 pm - 12:50 amHRL-SEA
8h 50m2 stops
Southwest Logo
11:15 am - 10:35 pmSEA-HRL
9h 20m2 stops
$449Southwest
Find Deal
Mon, Oct 6 - Wed, Oct 8
United Airlines Logo
2:05 pm - 11:29 pmHRL-SEA
11h 24m2 stops
United Airlines Logo
7:05 am - 4:13 pmSEA-HRL
7h 08m1 stop
$500United Airlines
Find Deal
Fri, Oct 3 - Sun, Oct 5
United Airlines Logo
2:05 pm - 9:53 pmHRL-SEA
9h 48m2 stops
United Airlines Logo
6:35 am - 7:41 pmSEA-HRL
11h 06m2 stops
$536United Airlines
Find Deal
Thu, Oct 2 - Mon, Oct 6

American Airlines flights from Harlingen, Texas to Seattle

Our best American Airlines deals on Harlingen, Texas to Seattle flight tickets
American Airlines
Nov 6
HRL5:40 amHarlingen Valley Intl
7h 04m
1 stop
SEA10:44 amSeattle/Tacoma Intl
Nov 9
SEA11:34 amSeattle/Tacoma Intl
9h 23m
1 stop
HRL10:57 pmHarlingen Valley Intl
$308
Find similar
American Airlines
Oct 2
HRL6:19 pmHarlingen Valley Intl
6h 40m
1 stop
SEA10:59 pmSeattle/Tacoma Intl
Oct 6
SEA11:24 pmSeattle/Tacoma Intl
8h 14m
1 stop
HRL9:38 amHarlingen Valley Intl
$339
Find similar
American Airlines
Oct 6
HRL6:20 pmHarlingen Valley Intl
6h 39m
1 stop
SEA10:59 pmSeattle/Tacoma Intl
Oct 8
SEA5:22 amSeattle/Tacoma Intl
6h 56m
1 stop
HRL2:18 pmHarlingen Valley Intl
$369
Find similar

Southwest flights from Harlingen, Texas to Seattle

Our best Southwest deals on Harlingen, Texas to Seattle flight tickets
Southwest
Nov 6
HRL12:15 pmHarlingen Valley Intl
10h 20m
2 stops
SEA8:35 pmSeattle/Tacoma Intl
Nov 9
SEA7:10 amSeattle/Tacoma Intl
13h 20m
2 stops
HRL10:30 pmHarlingen Valley Intl
$360
Find similar
Southwest
Dec 7
HRL5:45 amHarlingen Valley Intl
10h 45m
2 stops
SEA2:30 pmSeattle/Tacoma Intl
Dec 30
SEA5:00 amSeattle/Tacoma Intl
10h 00m
2 stops
HRL5:00 pmHarlingen Valley Intl
$414
Find similar
Southwest
Oct 6
HRL6:00 pmHarlingen Valley Intl
8h 50m
2 stops
SEA12:50 amSeattle/Tacoma Intl
Oct 8
SEA11:15 amSeattle/Tacoma Intl
9h 20m
2 stops
HRL10:35 pmHarlingen Valley Intl
$449
Find similar

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 September 19, 2025.
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 11/6

5:40 am-10:44 am

1 stop7h 04m

Seattle/Tacoma Intl

Sun 11/9

11:34 am-10:57 pm

1 stop9h 23m

$308

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Thu 10/2

6:19 pm-10:59 pm

1 stop6h 40m

Seattle/Tacoma Intl

Mon 10/6

11:24 pm-9:38 am

1 stop8h 14m

$339

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Thu 11/6

12:15 pm-8:35 pm

2 stops10h 20m

Seattle/Tacoma Intl

Sun 11/9

7:10 am-10:30 pm

2 stops13h 20m

$360

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Mon 10/6

6:20 pm-10:59 pm

1 stop6h 39m

Seattle/Tacoma Intl

Wed 10/8

5:22 am-2:18 pm

1 stop6h 56m

$369

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Thu 11/6

12:10 pm-11:15 pm

2 stops13h 05m

Seattle/Tacoma Intl

Sun 11/9

11:59 pm-10:59 am

1 stop9h 00m

$392

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Sun 12/7

12:13 pm-7:12 pm

1 stop8h 59m

Seattle/Tacoma Intl

Mon 12/29

12:59 am-9:40 am

1 stop6h 41m

$407

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Sun 12/7

5:45 am-2:30 pm

2 stops10h 45m

Seattle/Tacoma Intl

Tue 12/30

5:00 am-5:00 pm

2 stops10h 00m

$414

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Mon 10/6

6:00 pm-12:50 am

2 stops8h 50m

Seattle/Tacoma Intl

Wed 10/8

11:15 am-10:35 pm

2 stops9h 20m

$449

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Fri 10/3

2:05 pm-11:29 pm

2 stops11h 24m

Seattle/Tacoma Intl

Sun 10/5

7:05 am-4:13 pm

1 stop7h 08m

$500

HarlingenSeattle

HRL - SEA

HRLSEA

Harlingen Valley Intl

Thu 10/2

2:05 pm-9:53 pm

2 stops9h 48m

Seattle/Tacoma Intl

Mon 10/6

6:35 am-7:41 pm

2 stops11h 06m

$536

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 March to fly from Harlingen, Texas, when ticket prices are also cheap, with an average price of $312.

What is the cheapest day to depart on your flight to Seattle?

On average, the least expensive day to fly to Seattle from Harlingen, Texas is on a Thursday. momondo users have found tickets for Thursday departures for as low as $355. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Saturday is the most expensive day to depart from Harlingen, Texas because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $552.

What is the cheapest time of day to depart on your flight to Seattle?

Flying to Seattle from Harlingen, Texas in the morning is the least expensive time of day to depart. momondo users have found prices as low as $452 when looking at flights departing in the morning. Flights to Seattle are more costly at noon, with an average ticket price of $630. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

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

You could potentially save up to 33% 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?

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

Direct flights

None
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 6h 39m.

  • 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 $187Free CancellationRating
7.9
7,964 reviews
Search Delta flights
American AirlinesPriceFrom $251Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
United AirlinesPriceFrom $278Free CancellationRating
7.4
8,926 reviews
Search United Airlines flights
SouthwestPriceFrom $328Free CancellationRating
8.0
4,242 reviews
Search Southwest flights

Traveling to a place near Seattle?

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

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