HRL - SEA

$175 Find Cheap Flights from Harlingen to Seattle

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Harlingen to Seattle departing on 6/11. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Seattle

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Harlingen to Seattle, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Harlingen to Seattle, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$292
Typical prices: $610-$559
American Airlines
Fri 9/11Tue 9/22
HRL - SEA • 1 stop
Cheapest one-way
$175
Typical prices: $217-$270
American Airlines
Thu 6/11
HRL - SEA • 1 stop
Top airlines
Cheapest • from $292 (round-trip)
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
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Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Harlingen and Seattle. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $423 (round-trip)
Shortest trip • 7h 02m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 45% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Seattle!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Harlingen to Seattle (HRL-SEA)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Harlingen to Seattle that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Harlingen to Seattle

Fri, Sep 11 - Tue, Sep 22
American Airlines Logo
4:58 pm - 12:15 am
HRL
-
SEA
9h 17m
1 stop
American Airlines Logo
5:05 am - 4:31 pm
SEA
-
HRL
9h 26m
1 stop
$292American Airlines
Tue, May 5 - Sat, May 9
American Airlines Logo
6:00 am - 10:48 am
HRL
-
SEA
6h 48m
1 stop
American Airlines Logo
11:55 pm - 10:17 am
SEA
-
HRL
8h 22m
1 stop
$316American Airlines
Tue, May 5 - Sat, May 9
American Airlines Logo
6:00 am - 1:54 pm
HRL
-
SEA
9h 54m
2 stops
American Airlines Logo
11:55 pm - 10:17 am
SEA
-
HRL
8h 22m
1 stop
$321American Airlines
Tue, May 5 - Sat, May 9
American Airlines Logo
6:00 am - 1:54 pm
HRL
-
SEA
9h 54m
2 stops
American Airlines Logo
11:55 pm - 10:17 am
SEA
-
HRL
8h 22m
1 stop
$324American Airlines
Tue, May 5 - Fri, May 8
American Airlines Logo
6:00 am - 1:54 pm
HRL
-
SEA
9h 54m
2 stops
American Airlines Logo
12:59 am - 10:17 am
SEA
-
HRL
7h 18m
1 stop
$325American Airlines
Fri, Sep 11 - Mon, Sep 21
American Airlines Logo
4:58 pm - 12:15 am
HRL
-
SEA
9h 17m
1 stop
American Airlines Logo
11:30 pm - 10:16 am
SEA
-
HRL
8h 46m
1 stop
$333American Airlines
Tue, May 5 - Sun, May 10
American Airlines Logo
6:00 am - 10:48 am
HRL
-
SEA
6h 48m
1 stop
American Airlines Logo
11:55 pm - 10:17 am
SEA
-
HRL
8h 22m
1 stop
$336American Airlines
Tue, May 5 - Sat, May 9
American Airlines Logo
6:00 am - 1:54 pm
HRL
-
SEA
9h 54m
2 stops
American Airlines Logo
12:59 am - 10:17 am
SEA
-
HRL
7h 18m
1 stop
$346American Airlines
Tue, May 5 - Sat, May 9
United Airlines Logo
12:05 pm - 9:06 pm
HRL
-
SEA
11h 01m
2 stops
United Airlines Logo
8:51 am - 9:59 pm
SEA
-
HRL
11h 08m
2 stops
$351United Airlines
Sat, May 2 - Wed, May 6
American Airlines Logo
2:47 pm - 9:22 pm
HRL
-
SEA
8h 35m
1 stop
American Airlines Logo
10:25 am - 7:33 pm
SEA
-
HRL
7h 08m
1 stop
$355American Airlines
Booking Insights

KAYAK's insights & trends for Harlingen to Seattle flights

Get data-powered insights and trends into flights from Harlingen to Seattle to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Harlingen to Seattle?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Harlingen to Seattle departing in September.

What is the cheapest month to fly from Harlingen to Seattle?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Harlingen to Seattle, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Harlingen to Seattle is February, where tickets cost $250 (return) on average. On the other hand, the most expensive months are January and July, where the average cost of round-trip tickets is $604 and $603 respectively.

Good to know

Low seasonSeptember
Cheapest flight$175
Best time to beat the crowds but there is an average 27% increase in price.
Most popular time to fly with an average 31% increase in price.
Flight from Harlingen to Seattle

When to book flights from Harlingen to Seattle

Are your dates flexible? Find out the best times to travel from Harlingen to Seattle based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Harlingen to Seattle

  • What is the cheapest flight from Harlingen to Seattle?

    In the last 3 days, the lowest price for a flight from Harlingen to Seattle was $175 for a one-way ticket and $292 for a round-trip.

  • Do I need a passport to fly between Harlingen and Seattle?

    Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

  • Which aircraft models fly most regularly from Harlingen to Seattle?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Harlingen to Seattle?

    Star Alliance, and oneworld are the airline alliances operating flights between Harlingen and Seattle, with Star Alliance being the most commonly used for this route.

  • Which is the best airline for flights from Harlingen to Seattle, Southwest or United Airlines?

    The two airlines most popular with KAYAK users for flights from Harlingen to Seattle are Southwest and United Airlines. With an average price for the route of $603 and an overall rating of 8.0, Southwest is the most popular choice. United Airlines is also a great choice for the route, with an average price of $468 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from Harlingen to Seattle?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Harlingen to Seattle.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Harlingen to Seattle?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Seattle from Harlingen is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Harlingen to Seattle?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Seattle with an airline and back to Harlingen with another airline. Booking your flights between Harlingen and SEA can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Harlingen to Seattle?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Seattle from Harlingen up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 3 airlines serving from Harlingen to Seattle

 
See real verified KAYAK customer reviews for airlines flying from Harlingen to Seattle. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Harlingen to Seattle? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4330 reviews
8.0Comfort
7.5Entertainment
8.6Crew
7.0Food
8.1Boarding
Airline reviews

The seat was not comfortable. 1D. My back was sore all night and the next day.

8.0 ExcellentJolene, Apr 2026
LAS - DAL
Read more Southwest reviews

The seat was not comfortable. 1D. My back was sore all night and the next day.

Great flight. I didn't get a drink because I was asleep whole on the flight.

Great flight from Seattle to Phoenix and to Chicago-Midway from Phoenix

The new seat assignment thing is wierd. If you don’t pay for a seat they always assign you a middle seat regardless of how many people are on the flight. Idk… the new company that bought Southwest is trying to make it more profitable, but I’m just not seeing it. The flight attendants aren’t having as much fun anymore. It just feels like the airline is slowly dying. IMO. We shall see if Southwest is the next Toy’s R Us.

The Air hostess were very rude on my flight from Houston to Austin . Their regular communication itself felt a they are shouting at people.

Plane was late. Zero service for 2+ hour flight and it was not that bumpy.

I have roller bag with food and medication told me I couldn't bring on my 2nd flight today. 15 years flying with SW never an issue with that bag.

Great flight. Good snacks and drinks. Grateful it was free. The flight from Nashville to louisville, i think her name was Tracy (not sure that's right) super awesome, nice and cheerful. She really enjoyed being at work today! She was the person who scanned the boarding pass on flight wn941. She should be recommended for a raise !

I elected to pay for the upgrades and found very little difference

Flight was hours late, unable to sit next to spouse, I have had so much better experiences. Substantially better, only saving grace was that it was a short flight.

Great flight. Got to watch a movie. Smooth flight and early arrival at ORD.

Fine. The issues I had were associated with luggage being delayed from Turkey to Tanzania

Smooth and easy boarding, comfortable for the entire 5 hour flight, and the seat back entertainment was great! I appreciated all the features, from location info and maps, movies, the ability to connect with Bluetooth headphones, and good selection of movies. Food was good, normal airline snacks (I didn’t purchase anything)

I've been flying American mostly, and it's been very frustrating. This united flight makes me realize maybe the issue isn't flying, but the airline. United was a significantly better experience. The plane was more comfortable, with a normal amount of leg room (vs the ridiculous reductions AA has made), more comfortable seats, screens to watch movies. It was a much better experience!

We had excellent customer service despite the chaos at George Bush airport in Houston!

It isvvery small flight. No leg room . No space to put my personal item at feet.

Overall we had a good experience during our flight from San Francisco to Houston.

Airport terminal was outdated, flight was on a small jet with no wifi

Do not like the size of the overhead bin. I think staff should monitor the size of suitcases that are being carried on by passengers to ensure they meet the size requirement.

The power at the seat didn't work and the seat itself was difficult to adjust - this was a business class seat. Flight attendant gave me miles to compensate. The attendant was very professional and on top of his game the entire flight.

I was able to get the AA customer Service desk to put me on an earlier flight without any issues.

The seat was comfortable, the attendants were very nice and WiFi made my life so much easier with work. Kudos!

To have arrived on time and not 3 hours late after having already spent $100 to change to an earlier flight, only to arrive back home close to the original flight time.

American Airlines is a miserable experience. It is predictably miserable, in the sense that every time I fly American, I brace myself for the certainty that it will be unpleasant and uncomfortable. But it is unpredictable in the sense that I never know if the flight will be on time or delayed nine hours (both happened to me this week). I never know if I will be able to sit in the seat that I selected when I purchased the ticket or if I will be told by Customer Service (!!!) that I must relocate from first class to a seat in the back of the aircraft with no explanation (both happened to me this week). Will the food be frozen and half defrosted, or scalding hot? Will the drinks be warm? Will the flight attendants be surly and mean? Will the toilets be cramped and foul? Will the seats be narrow and uncomfortable? Will there be a real electric outlet at the seat, or just an unreliable USB-2 port? Will there be enough seats in the boarding lounge or just a few? Will the boarding process be smooth and efficient, or will the gate agents mess it up and delay it needlessly for 30 or 40 minutes? Will the catering and cleaning crew be prompt or will they take an extra 30 minutes? Will the brakes on the aircraft work properly, or will the pilot delay takeoff for four hours while the ground crew attends to what can only be described as routine maintenance that should have been done the night before? I've eexperienced every one of these unpleasant things this year, 2026. The only thing I can reliably count on is that American will find a new way to make the experience of flying as miserable as they possibly can.

The plane was very creaky and lots of ringing. Plane was dirty and dingy. I couldn't hear the captain's announcements from the flight deck. Not sure if it was the captain or the audio equipment, but good thing there wasn't an emergency where we needed clear instructions. The overhead compartments were clearly full, but the flight crew allowed people to stand in the back with their carry on luggage. Then after everyone boarded, they had to go to the front to gate check their luggage because there was no room for their bags and then they returned to their seats...such a waste of time when clearly the overhead compartments were full when they originally boarded.

The WiFi would not connect enough for me to do my actual work. It permaspooled, disconnected, said it was connected, then wouldn't open an email... it was frustrating. I am not a tall person, 5'4" - and I felt cramped with little room to reach into my bag under the seat in front of me. I feel sorry for anyone taller than me having to fly. the one positive thing I will add, is the overhead bins are roomy enough to manage more bags than other carriers.

Boarding was quick and efficient. We arrived at our destination early.

Seat was VERY uncomfortable. Flight was delayed and then boarded slowly. The crew was super helpful with boarding and supporting maximizing the luggage in the overhead.

Plane was super cold. No entertainment unless you were with mileage program Getting off the plane was super slow

The flight changed gates multiple times and flight had to be delayed multiple times

Everything you need to know for your flight from Harlingen to Seattle

Information on your arrival and departure airports