$162+ Cheap flights from Harlingen to Seattle (HRL - SEA)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/3. Fares are subject to change and may not be available on all flights or dates of travel.
HRL — SEA
Nov 25 — Dec 21
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Harlingen to Seattle with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Harlingen to Seattle
Cheapest
Best
Last-minute
One-way
Cheapest flights from Harlingen to SeattleExplore the most affordable flight options available from Harlingen to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 26, 2026.
Explore the most affordable flight options available from Harlingen to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 26, 2026.
This United Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/65:25 pm -
1 stop7h 26m
Tue 11/102:00 pm -
1 stop6h 48m
Deal found 10/22![United Airlines logo]()
$364
This American Airlines deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/810:44 am -
1 stop8h 12m
Sat 12/122:07 pm -
1 stop7h 19m
Deal found 10/25![American Airlines logo]()
$381
This United Airlines deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/87:10 am -
2 stops13h 23m
Thu 11/122:00 pm -
1 stop6h 48m
Deal found 10/23![United Airlines logo]()
$401
This United Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/55:25 pm -
1 stop7h 26m
Sun 11/87:05 am -
1 stop6h 56m
Deal found 10/22![United Airlines logo]()
$449
This United Airlines deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/82:00 pm -
2 stops9h 58m
Sat 12/127:30 pm -
2 stops13h 44m
Deal found 10/25![United Airlines logo]()
$488
This American Airlines deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/197:21 pm -
1 stop7h 38m
Tue 12/225:55 pm -
1 stop14h 09m
Deal found 10/24![American Airlines logo]()
$534
Best flights from Harlingen to SeattleDiscover carefully curated flight deals from Harlingen to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 26, 2026.
Discover carefully curated flight deals from Harlingen to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 26, 2026.
This United Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/212:05 pm -
2 stops12h 51m
Sun 1/247:00 am -
1 stop6h 53m
Deal found 10/22![United Airlines logo]()
$282
This Southwest deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/281:00 pm -
2 stops11h 30m
Sun 1/316:15 am -
2 stops9h 15m
Deal found 10/22![Southwest logo]()
$361
This American Airlines deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/810:44 am -
1 stop8h 12m
Sat 12/126:20 am -
2 stops9h 50m
Deal found 10/25![American Airlines logo]()
$480
This United Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/65:25 pm -
1 stop7h 26m
Tue 11/102:00 pm -
1 stop6h 48m
Deal found 10/22![United Airlines logo]()
$364
This United Airlines deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/87:10 am -
2 stops13h 23m
Thu 11/122:00 pm -
1 stop6h 48m
Deal found 10/23![United Airlines logo]()
$401
This United Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/51:59 pm -
2 stops13h 00m
Sun 11/87:05 am -
1 stop6h 56m
Deal found 10/22![United Airlines logo]()
$454
This Southwest deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1912:50 pm -
2 stops11h 30m
Sun 11/228:30 am -
1 stop11h 00m
Deal found 10/25![Southwest logo]()
$572
This Southwest deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/54:45 pm -
2 stops10h 15m
Sun 11/810:45 am -
2 stops8h 45m
Deal found 10/22![Southwest logo]()
$610
This United Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/212:05 pm -
2 stops12h 51m
Mon 1/257:00 am -
3 stops36h 59m
Deal found 10/22![United Airlines logo]()
$510
Last-minute flights from Harlingen to SeattleDiscover last-minute flight deals from Harlingen to Seattle. Data last updated October 26, 2026 and is based on user searches.
Discover last-minute flight deals from Harlingen to Seattle. Data last updated October 26, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/275:25 pm -
1 stop7h 26m
Sat 10/311:58 pm -
1 stop6h 50m
Deal found 10/22![United Airlines logo]()
$565
This United Airlines deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/305:25 pm -
1 stop7h 26m
Fri 11/610:40 am -
2 stops10h 08m
Deal found 10/25![United Airlines logo]()
$572
This United Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/55:25 pm -
1 stop7h 26m
Sun 11/87:05 am -
1 stop6h 56m
Deal found 10/22![United Airlines logo]()
$449
This United Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/65:25 pm -
1 stop7h 26m
Tue 11/102:00 pm -
1 stop6h 48m
Deal found 10/22![United Airlines logo]()
$364
This United Airlines deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/87:10 am -
2 stops13h 23m
Thu 11/122:00 pm -
1 stop6h 48m
Deal found 10/23![United Airlines logo]()
$401
One-way flights from Harlingen to SeattleSearch for one-way flight options from Harlingen to Seattle. Find affordable one-way fares based on user searches. Data last updated October 26, 2026.
Search for one-way flight options from Harlingen to Seattle. Find affordable one-way fares based on user searches. Data last updated October 26, 2026.
This United Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/32:00 pm -
2 stops11h 44m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/26![United Airlines logo]()
$162
This United Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/52:00 pm -
1 stop7h 32m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/26![United Airlines logo]()
$217
This United Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/251:59 pm -
2 stops11h 16m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/26![United Airlines logo]()
$223
This United Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/44:39 pm -
1 stop8h 12m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/26![United Airlines logo]()
$237
This American Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/22:24 pm -
1 stop10h 14m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/26![American Airlines logo]()
$330
Find flight deals from Harlingen to Seattle
Discover tips and strategies to find the most affordable flight options for your journey from Harlingen (HRL) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated October 26, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $221 (American Airlines) |
One-way from | $162 (United Airlines) |
Popular in | January |
Cheapest in | February |
Average price | $354 |
Cheapflights 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, Cheapflights users made 7,457,451 searches. Data last updated October 26, 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
Cheapest round-trip
HarlingenSeattle
HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl
HRLSEA
Harlingen Valley Intl
Thu 12/3
2:00 pm-7:32 pm
1 stop7h 32m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$167
HarlingenSeattle
HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl
HRLSEA
Harlingen Valley Intl
Sat 12/5
12:00 pm-9:58 pm
2 stops11h 58m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$222
Quickest round-trip
HarlingenSeattle
HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl
HRLSEA
Harlingen Valley Intl
Wed 11/25
1:59 pm-7:17 pm
1 stop7h 18m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$270
HarlingenSeattle
HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl
HRLSEA
Harlingen Valley Intl
Thu 1/21
2:05 pm-12:56 am
2 stops12h 51m
Seattle/Tacoma Intl
Sun 1/24
7:00 am-3:53 pm
1 stop6h 53m
$282
HarlingenSeattle
HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl
HRLSEA
Harlingen Valley Intl
Thu 1/28
1:00 pm-10:30 pm
2 stops11h 30m
Seattle/Tacoma Intl
Sun 1/31
6:15 am-5:30 pm
2 stops9h 15m
$361
HarlingenSeattle
HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl
HRLSEA
Harlingen Valley Intl
Fri 11/6
5:25 pm-10:51 pm
1 stop7h 26m
Seattle/Tacoma Intl
Tue 11/10
2:00 pm-10:48 pm
1 stop6h 48m
$364
HarlingenSeattle
HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl
HRLSEA
Harlingen Valley Intl
Tue 12/1
2:00 pm-9:58 pm
2 stops9h 58m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-2:00 am
Nonstop0h 00m
$392
HarlingenSeattle
HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl
HRLSEA
Harlingen Valley Intl
Sun 11/8
7:10 am-6:33 pm
2 stops13h 23m
Seattle/Tacoma Intl
Thu 11/12
2:00 pm-10:48 pm
1 stop6h 48m
$401
HarlingenSeattle
HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl
HRLSEA
Harlingen Valley Intl
Thu 11/5
1:59 pm-12:59 am
2 stops13h 00m
Seattle/Tacoma Intl
Sun 11/8
7:05 am-4:01 pm
1 stop6h 56m
$454
HarlingenSeattle
HRL Harlingen Valley Intl - SEA Seattle/Tacoma Intl
HRLSEA
Harlingen Valley Intl
Tue 12/8
10:44 am-4:56 pm
1 stop8h 12m
Seattle/Tacoma Intl
Sat 12/12
6:20 am-6:10 pm
2 stops9h 50m
$480
Showing 1-10 of 13 resultsSorted by cheapest first
Compare providers for flights from Harlingen to Seattle
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Harlingen to Seattle in October.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Harlingen-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Harlingen-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Harlingen-Seattle flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Harlingen-Seattle flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Harlingen-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Harlingen to Seattle
Have a flexible travel schedule? Discover the best time to fly to Seattle from Harlingen with our price prediction graph.
HRL-SEA
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Harlingen to Seattle
What is the cheapest month to book a flight from Harlingen to Seattle?
Currently, February is the cheapest month in which you can book a flight from Harlingen to Seattle (average of $263). Flying from Harlingen to Seattle in January is currently the most expensive (average of $604). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
How much does it cost to fly round-trip from Harlingen to Seattle?
Airfare is below average for this route at the moment.
Harlingen to Seattle flights typically cost between $355 and $400 in January.The cheapest round-trip price found within the last 5 days was $221 on American Airlines (Jan 21-Jan 25).
Reviews of airlines servicing Seattle
Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated October 26, 2026.
Read through reviews of airlines operating flights from Harlingen to Seattle, such as Southwest and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Food
7.0
Crew
8.6
Entertainment
7.4
Comfort
8.0
Boarding
8.1
Overall
7.9
Reviews
1 / 20
8.0
ExcellentPatricia,Oct 2026
DAL - TPA
Food
7.0
Crew
8.6
Entertainment
7.4
Comfort
8.0
Boarding
8.1
Overall
7.9
Reviews
1 / 20
8.0
ExcellentPatricia,Oct 2026
DAL - TPA
Food
7.0
Crew
8.6
Entertainment
7.4
Comfort
8.0
Boarding
8.1
Overall
7.9
Reviews
1 / 20
8.0
ExcellentPatricia,Oct 2026
DAL - TPA
Related info for your journey
Find useful and relevant information for your journey from Harlingen to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Seattle?
Book flights to Seattle if you plan to visit one of these locationsSeaTac
Renton
Tacoma
Lacey
Leavenworth
Tukwila
Snoqualmie
Puyallup
Lynnwood
Olympia
Centralia
Kent
Tumwater
Ocean Shores
Ellensburg
Issaquah
Lakewood
Poulsbo
Marysville
Shoreline
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Other flights from Harlingen
Popular flights
Seattle flight routes
Alternative routes for Harlingen to Seattle
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Seattle by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Harlingen to Seattle by cabin class
Find flights from Harlingen to Seattle, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Harlingen and Seattle flights
Browse other Harlingen and Seattle flight options. Last updated on October 26, 2026.
Other flights from Harlingen
Browse through other flights departing from Harlingen. Flights are based on user searches made on Cheapflights and were last updated on October 26, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to Seattle
Explore flights to Seattle departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on October 26, 2026.
Top 2 airlines flying from Harlingen to Seattle
Discover the top 2 airlines that operate flights from Harlingen to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated October 26, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$215 | Average$375 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$297 | Average$423 | FlexibilityNo cancel fee | On-time63% |