SEA - CUN

$162 Find Cheap Flights from Seattle to Cancun

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Cancún departing on 5/25. 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, 0 bags

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

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Cancun.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Cancun.
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Everything you should know

Cheapest round-trip
$395
Typical prices: $644-$398
Volaris
Fri 7/10Sat 7/18
SEA - CUN • 1 stop
Cheapest non-stop
$471
Typical prices: $638-$462
Delta
Sun 5/24Thu 5/28
SEA - CUN • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
Alaska Airlines' Wine Flies Free program is a perk.
Immigration at Cancun is quick with automated checks.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Cheapest • from $395 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
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Airline reviews
Airline reviews
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Nonstop flights
Every day
You can fly direct with Alaska Airlines and Delta. Average duration is 6h 00m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
Top layover airports
Cheapest • Avg $452 (round-trip)
Shortest trip • 8h 00m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 4% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 16% price drop
Most popular
Good to know
Good to know
+1
+1
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Cancún!
Flight Deals
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Expert advice
Flight Deals

Cheap Flights from Seattle to Cancún (SEA-CUN)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle to Cancún 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 Seattle to Cancún

Fri, Jul 10 - Sat, Jul 18
Volaris Logo
11:00 pm - 11:54 am
SEA
-
CUN
10h 54m
1 stop
Volaris Logo
12:43 pm - 7:49 pm
CUN
-
SEA
9h 06m
1 stop
$395Volaris
Sun, May 24 - Sun, May 31
Frontier Logo
7:50 pm - 12:04 pm
SEA
-
CUN
14h 14m
1 stop
Frontier Logo
3:39 pm - 2:01 pm
CUN
-
SEA
24h 22m
1 stop
$398Frontier
Sat, May 30 - Tue, Jun 2
Multiple Airlines Logo
11:00 pm - 1:41 pm
SEA
-
CUN
12h 41m
1 stop
Multiple Airlines Logo
3:39 pm - 10:06 am
CUN
-
SEA
20h 27m
1 stop
$401Multiple Airlines
Sun, Aug 23 - Sat, Aug 29
Frontier Logo
7:41 pm - 12:08 pm
SEA
-
CUN
14h 27m
1 stop
Frontier Logo
3:35 pm - 9:48 am
CUN
-
SEA
20h 13m
1 stop
$402Frontier
Tue, Aug 18 - Thu, Aug 27
Frontier Logo
7:41 pm - 12:08 pm
SEA
-
CUN
14h 27m
1 stop
Frontier Logo
3:35 pm - 9:48 am
CUN
-
SEA
20h 13m
1 stop
$405Frontier
Wed, Jun 3 - Wed, Jun 24
Multiple Airlines Logo
11:21 am - 2:06 pm
SEA
-
CUN
24h 45m
2 stops
Multiple Airlines Logo
3:35 pm - 9:48 am
CUN
-
SEA
20h 13m
1 stop
$406Multiple Airlines
Tue, Jun 23 - Sun, Jun 28
Frontier Logo
7:41 pm - 12:48 pm
SEA
-
CUN
15h 07m
1 stop
Frontier Logo
3:35 pm - 9:48 am
CUN
-
SEA
20h 13m
1 stop
$408Frontier
Sat, Aug 22 - Thu, Aug 27
Frontier Logo
7:41 pm - 12:08 pm
SEA
-
CUN
14h 27m
1 stop
Frontier Logo
3:35 pm - 9:48 am
CUN
-
SEA
20h 13m
1 stop
$409Frontier
Sat, May 30 - Wed, Jun 3
Multiple Airlines Logo
11:00 pm - 1:41 pm
SEA
-
CUN
12h 41m
1 stop
Multiple Airlines Logo
3:39 pm - 10:06 am
CUN
-
SEA
20h 27m
1 stop
$412Multiple Airlines
Thu, May 28 - Wed, Jun 3
Frontier Logo
3:19 pm - 12:04 pm
SEA
-
CUN
18h 45m
1 stop
Frontier Logo
3:39 pm - 10:06 am
CUN
-
SEA
20h 27m
1 stop
$413Frontier
Booking Insights

KAYAK's insights & trends for Seattle to Cancún flights

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

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

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

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

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

Your flight ticket price will generally be cheaper if you fly to Cancun on a Wednesday and more expensive on a Saturday. On your return trip to Seattle, you should consider flying back on a Saturday, and avoid Tuesdays for better deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Seattle to Cancún, 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 Seattle to Cancun is October, where tickets cost $462 (return) on average. On the other hand, the most expensive months are December and April, where the average cost of round-trip tickets is $718 and $659 respectively.

Can I save money by flying with a layover from Seattle to Cancun?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 2 stops layover the cheapest option at $496 on average.

How far in advance should I book a flight from Seattle to Cancun?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Seattle to Cancún, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Seattle to Cancun, you should book around 3 weeks before departure, which saves you about 4% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 9 weeks before departure.

Expert advice

Expert advice for your flight from Seattle to Cancún

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on Delta

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Harriet Baskas

Harriet Baskas

Expert on Alaska Airlines and SEA

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Brandon Schultz

Brandon Schultz

Expert on CUN

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Good to know

Low seasonSeptember
Cheapest flight$162
Best time to beat the crowds with an average 16% drop in price.
Most popular time to fly with an average 30% increase in price.
Flight from Seattle to Cancun

When to book flights from Seattle to Cancún

Are your dates flexible? Find out the best times to travel from Seattle to Cancún 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 Seattle to Cancun

  • Are there nursing stations at Seattle-Tacoma?

    There are various nursing rooms throughout the Seattle-Tacoma International Airport. Mothers can enjoy some privacy and quiet time before boarding their flight to Cancun. You’ll find a nursing room in each concourse, by Gate A10, by A1 before entering Concourse B, C10, D3 and D11, S9, and across from N19. There are also companion care restrooms around the airport.

  • Do I need to exchange currency at Cancun International Airport (CUN)?

    You will need to exchange some USD for Mexican Pesos (MXN) to have cash for your trip to Cancun. This is possible to do upon your arrival at Cancun International Airport (CUN). There are currency exchange desks in the arrival halls of the terminals. For instance, there is a currency exchange location on Level 0 of Terminal 2, by Starbucks.

  • Are there any pet relief areas at Seattle-Tacoma (SEA)?

    For those traveling out of Seattle-Tacoma International Airport (SEA) with pets or service animals, visit one of the airport’s pet relief areas close to your departure gate. Here your pet can stretch its legs and relieve itself before the long flight to Cancun. You’ll find the relief areas in front of security Checkpoints 1 and 3 on the departure floor, and by the blue train station at Concourse S.

  • How can I get from Cancun International Airport to Downtown Cancun?

    If you don’t wish to get a taxi, it’s possible to book an airport bus that takes you to main areas like Downtown Cancun, Playa del Carmen, or Tulum. The Downtown Cancun bus departs from Terminals 2, 3, and 4. You can expect the ride to be about 35 minutes long and for it to cost around 133.70 MXN (6.80 USD). Other destinations such as Playa del Carmen may cost more, closer to 277.60 MXN (13.50 USD).

  • What is the cheapest flight from Seattle to Cancun?

    In the last 3 days, the lowest price for a flight from Seattle to Cancun was $162 for a one-way ticket and $395 for a round-trip.

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

    A passport is required to fly from Seattle to Cancun.

  • Which airlines offer Wi-Fi service onboard planes from Seattle to Cancun?

    JetBlue, Aeromexico, Alaska Airlines, and Delta offer inflight Wi-Fi service on the Seattle to Cancun flight route.

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

    The Airbus A321neo is the aircraft model that flies most regularly on the Seattle to Cancun flight route.

  • Which airline alliances offer flights from Seattle to Cancun?

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

  • On which days can I fly direct from Seattle to Cancun?

    There are nonstop flights from Seattle to Cancun on a daily basis.

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

    The two airlines most popular with KAYAK users for flights from Seattle to Cancun are Southwest and Delta. With an average price for the route of $634 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 $590 and an overall rating of 7.9.

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

    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 Seattle to Cancun.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Cancun from Seattle 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 Seattle to Cancun?

    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 Cancun with an airline and back to Seattle with another airline. Booking your flights between Seattle and CUN 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 Seattle to Cancun?

    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 Cancun from Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Seattle to Cancun

  • Looking for a cheap flight? 25% of our users found flights on this route for $333 or less one-way and $575 or less round-trip.
  • Although there are some direct routes from Seattle-Tacoma International Airport (SEA) to Cancun International Airport (CUN), they are generally more affordable with a layover in between. United Airlines makes a stop in Denver (DEN), while American Airlines stops in Dallas-Fort Worth (DFW).
  • If you’re renting a car from Cancun International Airport (CUN) the agencies are located in the airport surroundings. As you exit the arrival hall of your entry terminal, follow the indications for the car rental area, and pick up your car directly from the airport parking lot.
  • Decompress and relax before your long flight from Seattle to Cancun. At Seattle-Tacoma Airport there are spas you can enjoy before your boarding time. There’s a Getaway Spa near the Terminal’s Gate A5 and another by Gate C2.
  • Use the free SEA Underground when getting around Seattle-Tacoma International Airport (SEA), especially to Concourses N and S since they are only connected to the terminal by train. There are three train lines, yellow, green, and blue, that connect all the stations in the Terminal Concourses.
  • Cancun International Airport (CUN) is the best hub to fly into to visit some iconic destinations in the Riviera Maya. This airport serves top attractions like Tulum, the Playa del Carmen, and Playa Delfines.

Prefer to fly direct from Seattle to Cancun?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Seattle/Tacoma Intl to Cancun.
Find which airlines fly direct from Seattle/Tacoma Intl Airport to Cancun Airport, which days they fly and book direct flights.

Direct departures

Seattle/Tacoma Intl to Cancun

Monday

Alaska Airlines,Delta

Alaska Airlines,Delta

Tuesday

Alaska Airlines,Delta

Alaska Airlines,Delta

Wednesday

Alaska Airlines,Delta

Alaska Airlines,Delta

Thursday

Alaska Airlines,Delta

Alaska Airlines,Delta

Friday

Alaska Airlines,Delta

Alaska Airlines,Delta

Saturday

Alaska Airlines,Delta

Alaska Airlines,Delta

Sunday

Alaska Airlines,Delta

Alaska Airlines,Delta

See more direct flights

Direct returns

Cancun to Seattle/Tacoma Intl

Monday

Alaska Airlines,Delta

Alaska Airlines,Delta

Tuesday

Alaska Airlines,Delta

Alaska Airlines,Delta

Wednesday

Alaska Airlines,Delta

Alaska Airlines,Delta

Thursday

Alaska Airlines,Delta

Alaska Airlines,Delta

Friday

Alaska Airlines,Delta

Alaska Airlines,Delta

Saturday

Alaska Airlines,Delta

Alaska Airlines,Delta

Sunday

Alaska Airlines,Delta

Alaska Airlines,Delta

See more direct flights

Reviews of the top 5 airlines serving from Seattle to Cancún

 
See real verified KAYAK customer reviews for airlines flying from Seattle to Cancun. 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 Seattle to Cancún? 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.
7.9
Alaska AirlinesOverall score based on 12319 reviews
7.0Entertainment
8.1Boarding
7.8Comfort
8.5Crew
7.1Food
Airline reviews

The crew was great and everything went smoothly coming and going.

10.0 ExcellentHayes, Apr 2026
SEA - IDA
Read more Alaska Airlines reviews

The crew was great and everything went smoothly coming and going.

My window seat did not have a window. I chose seat 11A thinking I would have a view. I had a wall instead.

See what I wrote in the previous section. This was a terrible experience. I would like refund.. I even paid an extra $70 for an aisle seat closer to the front to ensure that I got off early enough to catch the next flight. The fact that the plane did not wait, and even left eearlier, knowing that the first flight came in late, and was moved to a terminal three train stops away is appalling. My friend that flew JetBlue, their flight was delayed and came in later and the connecting flight WAITED for them. How is it that JetBlue could do that, and Alaska could not.

Overall, it was a good flight. My only quip- they made us check our carry on bags when there was plenty of overhead space left. My wife and I thought maybe the aircraft was really full, but that wasn’t the case. There were a number of open seats, and even more overhead compartments with no luggage. A minor annoyance, sure, but when we intentionally didn’t check luggage to make it easier, it was disappointing to have to do it anyways.

This was my second time flying Alaska Airline in the 1st Class cabin. Everything was fine with the exception of the food and entertainment. The food was just ok but not what I was expecting from 1st Class. A BBQ pork sandwich and baked potato. There wasnt any in-flight entertainment. I found that odd since it was a coast to coast flight Seattle to Dulles. My sister flew 1st Class on Delta on a shorter flight ( Seattle to Cincinnati) and had an awesome meal and in-flight entertainment. I typically fly Delta but there wasn’t a flight with times that fit my schedule. I am by no means a primary donna. But when my upgrade cost over $900…I didn’t use any reward miles…I was expecting more than what I got. I will never fly Alaska Airline 1st Class again. I will stick with Delta for all my travel needs whether it’s in 1st Class or coach.

Good staff. Comfortable seats. Had to check my bag because the flight was too full.

Loved this first class flight! Awesome food, snacks and drinks. Comfortable seat with foot rest. Good movie. Very friendly crew! Only thing I would suggest is having a screen on seat back in front of me so I didn’t have to watch the movie on my phone.

The crew was very attentive, boarding was orderly. I really liked the way Alaska Airlines gives boarding passes and dropping off my bags. Very smooth.

Once we were in the air, the flight was nice and smooth. The flight was about twenty minutes late to begin with, though, and then we needed to wait to land for another plane to land first.

Flight crew great! No WiFi not great. Someone took my bag not great!

Crew was nice, meal was good. Entertainment had to be rebooted 3 times and still did not work. Turns out there was residue on screen, it needed to be cleaned to prevent the touchscreen buttons from continuously activating. I had entertainment for the last 45 minutes of a 5 hour 45 minute flight. Really unacceptable for first class. Flight attendent indicated your cleaning solution creates this problem. Seems as if this is widely known, you should be using a different product or cleaning better. Really really disappointing which simply added to the wi fi on your planes with reliably never ever works.

Snacks and included beverages were appreciated. Boarding went smoothly. Plenty of overhead bin space. Seats get very uncomfortable after a couple of hours. After waiting 10 painful minutes for my walker, a very nice Delta guest agent pushed me in a wheelchair to the gate. It was finally delivered to me after another 15 minutes . Our checked bag was on the carousel long b4 I was able to retrieve it. Fortunately it was still there but somewhere along the way the straps we used to secure it were removed and and were not reattached. Wish I had made note of the agents name.

It was fine. 55 minute flight. No snacks or beverage service offered. Boarding went smoothly and my walker was waiting for me on the jet way.

The cabin temperature was nice and cool. The wifi was not working.

With Aeromexico it ended up good but with Delta it was bad because we did everything through Delta... Showed up at the Delta terminal... It was the wrong place! Nothing ever told us to go to the Aeromexico terminal. It said "in partnership with Aeromexico" but I was never instructed to check in with them or go to their terminal. We had to haul @$$ running through the airport and almost didn't make it thanks to this poor communication. 👎🏽

Could not get my connecting flight boarding pass until four hrs before departure! Ver annoying especially since the staff could not explain why!

First flight out and was 85 minutes delayed. Notification came out way too late

Excellent!!! Aeromexico is a great airline. What was not that good is the service provided by Kayak. It is never clear and not easy to manage.

Was forced to check in my small carry on, even though I informed the crew it has very fragile items inside

First class and monitors weren’t working for mine & my husbands. Eventually fixed, but quite annoyed as we bought first class. Also, No foot rests.

All went very well. We used the AIFI Airport, such a lovely facility. Definitely needs better transportation options to get there.

Both ground crew and flight crew were rude, and did not provide any level of service. They made it very difficult as we were traveling with a passenger the required assistance.

From the check-in, to the flight, and arriving, everything went very smoothly. Unfortunately, when I received my baggage it was severely damaged. I have a hard shelled suitcase and it was completely smashed it. I’m not sure how this could happened but I am extremely disappointed that my belongings were damaged beyond repair and continued use.

Really nice, all good, nice crew and all on time

Unfortunately I had an awful boarding experience. Our first flight with Aeromexico was fine and landed on time however it couldn’t find a gate and we were late which made us lose our connecting flight with Aeromexico. The staff handled it horribly when we explained our situation and would not led us board when we missed the boarding time by a couple minutes. The staff were extremely rude and did not attempt to even help us. Because of this incident, my husband and I missed a full day of work which negatively impacted our salary which we need. Please compensate us for the work that we missed.

It was OK. The flight is pretty long for the airlines to only offer a simple sandwich on business class. The entertainment is similar to that on other Skyteam members. Ultimately the airline lost my bag and didn’t deliver it to me until the next day after a lengthy lost baggage report.

Good, the flight from Miami to Mexico City was better than Mexico City to Miami

Aeroméxico cancelled my ticket without advice AND It make a last minute mess in my intinerary, no solving my situation, bad advice and bad customer service

Flight was on time, good service, but there was no free WiFi, even for first class passengers

It was good in general. The Crew during the flight were very nice at all times.

Some crew were unfriendly or in some cases just straight up rude.

Booked through Kayak Business, had a seat in middle and towards back due to booking rate, not comfortable.

Was great in general, try to respect time and excuses when slight changes have been made, appreciated!

A long delay. Don't travel late in the day.

Super friendly with lots of drink options an entertainment. Friendly crew.

Standard flight with a drinks and a snack- overall very quick flight. The flight attendants were very strict, bordered on rude.

Outstanding service, efficient & friendly crew, flight was safe, comfortable & on time

United Airline crews were very friendly and very attentive. 12 hours flight was gone like in a shorter one.

Delayed - weather wasn't bad at either end. Also sat on tarmac in ORD.

Food was surprisingly delicious. Space in the seat is horrible when the seating front is reclined. Movie offerings were terrible. Crew was friendly and helpful.

I would like a refund for the extra cost the seat I paid for. An oversized person sat next to me and I couldn’t fit on my seat and had to move to another seat.

Boarding gate at LAX was too crowded—two gates next to one another

The flight was delayed about an hour for a maintenance specialist to approve the maintenance repair

This flight was delayed but it worked in my favor because my Atlanta to Dallas flight was delayed.

This was a hard flight. 3 delays out of OKC (1 on the Tarmac). Delay in Atlanta coming to Dallas. total travel time was the equivalent of driving from OKC to Atlanta.

Like: flights are on time, good boarding process Can improve: planes are old, improve entertainment and make space more comfortable

Had to wait for a gate for a long time, then waited on the run way for a long time before leaving. The actual flights part was good.

The airplane was an old model, the overhead didn’t have enough room for people’s items and made boarding and boarding disappointing and stressful. Crew allowed passengers to bring more than the permitted baggage sizes.

Flying in the United States with the major airlines has become so underwhelming. A 2-3hr flight in most other parts of the world with the major carriers of the area comes with newer, CLEANER aircraft and significantly better in flight service in terms of both staff attitude and a actual meal service.

On time departure and early arrival. Flight attendant very nice.

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

Information on your arrival and departure airports