HRL - SEA

$170 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 11/25. 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

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
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 23% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

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

Sat, Dec 13 - Mon, Dec 15
American Airlines Logo
10:11 am - 3:24 pmHRL-SEA
7h 13m1 stop
American Airlines Logo
5:18 am - 3:29 pmSEA-HRL
8h 11m1 stop
$237American Airlines
Find Deal
Sat, Dec 13 - Sun, Dec 14
American Airlines Logo
5:36 am - 10:38 amHRL-SEA
7h 02m1 stop
American Airlines Logo
12:31 am - 9:41 amSEA-HRL
7h 10m1 stop
$267American Airlines
Find Deal
Thu, Nov 13 - Thu, Nov 20
American Airlines Logo
12:11 pm - 7:15 pmHRL-SEA
9h 04m1 stop
American Airlines Logo
5:24 am - 3:36 pmSEA-HRL
8h 12m1 stop
$299American Airlines
Find Deal
Sat, Dec 13 - Mon, Dec 15
United Airlines Logo
12:16 pm - 11:15 pmHRL-SEA
12h 59m2 stops
United Airlines Logo
11:59 pm - 11:04 amSEA-HRL
9h 05m1 stop
$300United Airlines
Find Deal
Thu, Nov 13 - Thu, Nov 20
United Airlines Logo
5:00 am - 1:38 pmHRL-SEA
10h 38m2 stops
United Airlines Logo
9:04 am - 9:54 pmSEA-HRL
10h 50m2 stops
$353United Airlines
Find Deal
Mon, Dec 22 - Fri, Jan 9
Southwest Logo
3:40 pm - 12:35 amHRL-SEA
10h 55m2 stops
Southwest Logo
5:15 am - 5:05 pmSEA-HRL
9h 50m2 stops
$384Southwest
Find Deal
Thu, Dec 4 - Fri, Jan 2
Southwest Logo
10:30 am - 6:40 pmHRL-SEA
10h 10m2 stops
Southwest Logo
6:15 am - 7:35 pmSEA-HRL
11h 20m2 stops
$408Southwest
Find Deal
Sun, Oct 26 - Fri, Oct 31
Multiple Airlines Logo
11:35 am - 5:13 pmHRL-SEA
31h 38m1 stop
Multiple Airlines Logo
2:22 pm - 12:13 pmSEA-HRL
43h 51m2 stops
$505Multiple Airlines
Find Deal
Mon, Dec 29 - Fri, Jan 9
Multiple Airlines Logo
11:13 am - 10:24 amHRL-SEA
25h 11m1 stop
Multiple Airlines Logo
2:54 pm - 10:24 amSEA-HRL
41h 30m2 stops
$545Multiple Airlines
Find Deal
Sun, Nov 23 - Sun, Nov 30
Sun Country Air Logo
12:10 pm - 5:21 pmHRL-SEA
31h 11m1 stop
Sun Country Air Logo
11:59 pm - 11:01 amSEA-HRL
9h 02m1 stop
$584Sun Country Air
Find Deal

Everything you should know

Top airlines
American Airlines
Cheapest • from $237 (round-trip)
Southwest
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
February
Cheapest • 39% price drop
July
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$237
Overall average: $463
American Airlines
Sat 12/13Mon 12/15
HRL - SEA • 1 stop
Cheapest one-way
$170
Typical prices: $186-$244
American Airlines
Tue 11/25
HRL - SEA • 1 stop
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!
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.

What’s the cheapest day of the week to fly from Harlingen to Seattle?

The average price of all round-trip flights from Harlingen to Seattle clicked on KAYAK for each day over the last 12 months.

If your flying dates are flexible, you should consider flying to Seattle on a Thursday, as we generally find the cheapest rates on that day for this route. On the other hand, Saturday is the most expensive day to fly from Harlingen to Seattle. For your return ticket, we recommend flying on a Thursday and avoiding Mondays for the best deals.

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 $263 (return) on average. On the other hand, the most expensive months are July and January, where the average cost of round-trip tickets is $610 and $558 respectively.

Good to know

Low seasonJanuary
Cheapest flight$170
Best time to beat the crowds but there is an average 30% increase in price.
Most popular time to fly with an average 42% 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 $170 for a one-way ticket and $237 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?

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

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

    The two airlines most popular with KAYAK users for flights from Harlingen to Seattle are Southwest and Delta. With an average price for the route of $603 and an overall rating of 8.0, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $297 and an overall rating of 7.9.

  • 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 4 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 4240 reviews
8.0Comfort
7.5Entertainment
7.0Food
8.1Boarding
8.6Crew
Airline reviews

I was re-booked onto another flight because my original flight was delayed and I would have missed my connector. I ended up in the “C” group after paying extra to be in the “A “ group on the original flight. At least if you’re going to re-book people, re-book them into the same group.

2.0 MediocrePrincess, Oct 2025MSY - DAL
Read more Southwest reviews

I was re-booked onto another flight because my original flight was delayed and I would have missed my connector. I ended up in the “C” group after paying extra to be in the “A “ group on the original flight. At least if you’re going to re-book people, re-book them into the same group.

Flight was delayed due to plane not passing inspection And one of the crew had to time out and we had to wait for another one A 3 hour delay

mandatory demand customer to check their carry on because not enough people check bags.

AC sub par. WiFi not working correctly. Ac sucked. Seats very narrow.

southwest just starting charging for luggage. hadnt realized it until it was too late. now out $70 when i couldve bought a carry on if i wouldve known. free bags was one of the only reasons i chose southwest over another airline (the other being no assigned seats, which is apparently also being changed). stupid business decision. wont be flying southwest anymore.

Delayed flight. Nicest crew member was a SW pilot flying seated next to me who kindly move to seat the final passenger. Flight extra delayed. My cup of refreshment of ginger ale was so packed with ice it was literally 2 sips.

Southwest is Southwest. No frills. If you're luck enough to get a happy crew (we did), then it makes for a nicer flight.

Flight crew and cabin crew were great. I had to rearrange flights because my original flight was 3hrs delayed for weather, the rub is the flight I moved to boarded on time then we sat at the gate for 2 hours because scheduling stole our first officer for another flight, TWICE. Then our actual FO was an hour delayed. To make it worse my original flight went from a 3 hour delay to departing 15min EARLY. Just poor scheduling operations all around.

Bring back peanuts Take our drink orders when were all seated, especially after you switch to assigned seating.

I’ve always loved Southwest. No issues at all. I was flying standby and the gate agent was extremely friendly and helpful. Boarding was smooth and I was able to get a window seat in the emergency exit row. Crew was fantastic! They were very professional and accommodating. We had to divert from our destination due to weather but the flight crew kept everyone at ease and informed us of all pertinent information. Excellent flight

Flight delayed for two and half hours and then canceled altogether due to mechanical issues. No mechanic onsite to fix so had to send one from LAX.

Check in process was terrible. Lady at counter didn’t know what she was doing

Delayed and took off even later than the scheduled delay time

Everything was good until we were boarding our connection flight in Atlanta, we were told to gate check our carry-on, but when we got inside the plane, there was plenty of room in the overhead.

There was a security issue at the airport and we were unable to land. We circled endlessly and then landed at another airfield for fuel. We then circled the airport again, almost landed but didn’t fully touch down before circling again. I am thankful to the crew for keeping us safe- the issue was the airline and staff at the airport getting us seats on our connecting flights. That part was hours of searching for someone and getting in double my steps.

Boarding was organised and relaxed. Crew were fantastic! Seats were lacking padding causing butt pain and stiffness.

The check in and bag drop off for Sky Priority members is slow. The Clear security was also slow - a TSA issue.

Food from the flight from Atlanta to Santiago was very poor..

The worst part was I was NOT allowed in the lounge even though I was holding a first class ticket and have a premium American Express card. I have flown Business or First Class with many airlines. Delta is the ONLY one who does not extend this courtesy to anyone except people who hold the very expensive American Express card. As a result, I won’t fly Delta if I have any other choice.

Simply outstanding. Their new lounge for Delta One customers is a cut above the rest.

The newer screen was super cool and had the option to watch many different shows or movies. Crew was polite and helpful. However again, many children screaming bloody murder and kicking my seat, and parents doing nothing about it as usual.

Flight was good and crew was super polite. However, there were around 5 kids screaming the WHOLE 2 hours. I understand kids have to come but parents need to do something to control their children. They make the experience terrible, especially after finishing 16 hour shifts at the hospital I needed some sleep, which I did not get.

Plane was crowded and even when we hit altitude, the plane was hot, not enough air flow.

Overall it was good. I missed my connection but I was put on another flight.

Gate agent did not hold flight for connection, provided no assistance to get new flight

it was so bad. I tried to board my flight from vancouver to saskatoon. And to my surprise they did not board me cause the flight was changed and no email was send to me. and on my boarding pass which i got from seattle says different flight. I did not knew anyone from Vancouver, air canada crew was rude, i asked for today flight but they were rude and i had early morning dental appointment in saskatoon. I was so much in pain and my whole day is wasted today. and i suffered alot. They did provide me hotel but they did not provide me any food. I am really really disappointed first time had so bad experience with air canada. I may think twice to book it again. If i can get any reply or any composition that would be great. Thanks

Smooth flight. Boarding was chaotic. Could not hear the gate agent over the intercom. People were lined up in the wrong lines. Groups one and two were told to board through line one and group 3 through line 2. All very confusing. Once in the air, the flight was smooth. There was no entertainment option on this aircraft, even though it was a larger aircraft.

leg space better than expected. two washrooms for one plane isn't enough.

We boarded but then sat there waiting on some missed connection people to get on so we sat for about 15 minutes for that. Then we sat again because the passenger manifest was wrong and they had to figure it out before we could leave. That took about another 20 minutes or so. The crew was working hard to figure it out so it’s not their fault. It ended up being a system glitch where someone was upgraded to first class while another person was also in the same seat and it just created a mess that took a little while to figure out. They literally went to every person on the plane asking their names to see who was sitting in the wrong seat. I also hate the entertainment that must be watched on your phone or tablet. Just give us setback screens. It’s so much better. Almost every Delta flight has this now and it is so nice to have them. The crew did a great job. I have no complaints from them. They were very hard working, even with the mishap and a disgruntled passenger.

My priority checked bag was not loaded on the flight. I had to sit in baggage claim in Las Vegas for 2 1/2 hours waiting for the next flight. All baggage staff were very helpful, tracking showed it as scanned for loading. Nobody told me why it wasn't on my flight.

Poor seat in rear of aircraft Food at Admiral’s Club Terminal D at DFW inedible

Flight was delayed because of a bird strike. They had another plane available within 45 minutes.

After we landed we sat on the tarmac for 1.5 hours waiting to get to our gate. Ridiculous.

We were delayed for a “couple of maintenance issues.” They were resolved rather quickly but a computer glitch caused someone in the airport to have to bring a physical copy of the paperwork so we could leave. I don’t know where they had to drive from to get to our plane but it took forever & we were 1 1/2 hrs late in leaving. The flight itself was fine.

We didn't take off until an hour after we boarded.

The flight was fine. This survey is not. There is no option for N/A so items which don’t apply to my experience still must be rated. In those instances I give a “3” rating which ultimately skews the results.

The actual trip was fine, however, the changes made to our flights and the layovers were had to endure were awful.

Flight from Dallas to OKC was good, but my trip was interrupted due to a delayed flight from Austin to DFW, which happens all the time. I frequently miss my connection from DFW and American can never seem to make this work!

Because the plane was 90 degrees F, they would not let us board. I wish they had, because it meant we were delayed. It's Texas, of course it's hot. We would have survived.

Wish they had the seat-back video screens for watching movies or playing games.

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

Information on your arrival and departure airports

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.