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$139+ Cheap flights from Washington, D.C. (WAS) to Seattle (SEA)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/27. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — SEA
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
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Cheapflights Tip: The best prices from Washington, D.C. to Seattle/Tacoma Intl are usually found in September or October, booked 85 days in advance, depart on a Tuesday or Wednesday and return on a Thursday

Cheap flight deals from Washington, D.C. to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Washington, D.C. (WAS) 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 August 14, 2025.

Round-trip from

$231
(FlightHub)

One-way from

$139
(Southwest)

Popular in

December

Cheapest in

September

Average price

$414

Good round-trip deal

$305 or less

Good one-way deal

$192 or less
From Washington, D.C. (WAS) to Seattle/Tacoma Intl
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One-way flight from Washington, D.C. (WAS) to Seattle/Tacoma Intl
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Highest demand for flights based on searches. 4% potential increase in price ($21 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Price to beat on a round-trip flight from Washington, D.C. (WAS) to Seattle/Tacoma Intl.
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Price to beat on a one-way flight from Washington, D.C. (WAS) to Seattle/Tacoma Intl.
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Find flight deals from Washington, D.C. to Seattle

Cheapest flights from Washington, D.C. to Seattle
Explore the most affordable flight options available from Washington, D.C. to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

This Mytrip deal was found by Cheapflights users on 8/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/76:27 pmBWI - SEA
1 stop9h 03mMultiple Airlines
Thu 9/116:31 pmSEA - BWI
1 stop12h 02mMultiple Airlines
Deal found 8/14$232
This Orbitz deal was found by Cheapflights users on 8/14. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/197:37 pmBWI - SEA
Nonstop5h 50mMultiple Airlines
Sun 9/216:12 amSEA - BWI
1 stop8h 30mMultiple Airlines
Deal found 8/14$233
This Frontier deal was found by Cheapflights users on 8/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/156:27 pmBWI - SEA
1 stop9h 03mFrontier
Sun 9/218:35 pmSEA - BWI
2 stops19h 35mFrontier
Deal found 8/14$234
This Kiwi.com deal was found by Cheapflights users on 8/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/57:37 pmBWI - SEA
Nonstop5h 50mMultiple Airlines
Sun 9/76:12 amSEA - BWI
1 stop8h 30mMultiple Airlines
Deal found 8/14$235
This CheapOair deal was found by Cheapflights users on 8/14. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/196:27 pmBWI - SEA
1 stop9h 03mFrontier
Mon 9/226:12 amSEA - BWI
1 stop8h 30mFrontier
Deal found 8/14$237
This Kiwi.com deal was found by Cheapflights users on 8/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/58:14 pmBWI - SEA
2 stops27h 25mFrontier
Sun 9/76:12 amSEA - BWI
1 stop8h 30mFrontier
Deal found 8/14$238
This FlightHub deal was found by Cheapflights users on 8/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/146:27 pmBWI - SEA
1 stop9h 03mMultiple Airlines
Wed 9/176:10 pmSEA - BWI
1 stop14h 13mMultiple Airlines
Deal found 8/14$239
This CheapOair deal was found by Cheapflights users on 8/14. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/226:27 pmBWI - SEA
1 stop9h 07mFrontier
Mon 8/256:17 amSEA - BWI
1 stop8h 24mFrontier
Deal found 8/14$240
This Kiwi.com deal was found by Cheapflights users on 8/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/135:45 amBWI - SEA
1 stop21h 14mMultiple Airlines
Sat 9/209:39 pmSEA - BWI
1 stop30h 22mMultiple Airlines
Deal found 8/13$241
This Frontier deal was found by Cheapflights users on 8/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1111:43 amBWI - SEA
2 stops15h 47mFrontier
Sun 9/148:35 pmSEA - BWI
2 stops19h 35mFrontier
Deal found 8/14$242
This Delta deal was found by Cheapflights users on 8/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/167:15 amBWI - SEA
1 stop10h 30mDelta
Fri 1/91:30 pmSEA - BWI
1 stop7h 12mDelta
Deal found 8/14$243
This American Airlines deal was found by Cheapflights users on 8/12. 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.
Thu 9/42:46 pmBWI - SEA
1 stop8h 13mAmerican Airlines
Wed 9/1011:38 pmSEA - BWI
1 stop7h 10mAmerican Airlines
Deal found 8/12$244

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington, D.C. 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 2,558,603 searches. Data last updated August 14, 2025.
Use the filters below to find and compare flights from Washington, D.C. to Seattle that are best for you.

Fly from

Washington, D.C.

Fly to

Seattle

Route

Depart

Return

Price

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Fri 10/3

7:06 pm-11:43 pm

1 stop7h 37m

Seattle/Tacoma Intl

Fri 10/10

5:00 pm-6:00 am

1 stop10h 00m

$243

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Mon 11/3

7:15 am-2:45 pm

1 stop10h 30m

Seattle/Tacoma Intl

Wed 11/5

5:00 pm-6:00 am

1 stop10h 00m

$243

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Thu 11/6

7:15 am-2:45 pm

1 stop10h 30m

Seattle/Tacoma Intl

Mon 11/17

11:55 pm-10:51 am

1 stop7h 56m

$243

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Wed 10/1

12:17 pm-6:51 pm

1 stop9h 34m

Seattle/Tacoma Intl

Wed 10/8

1:35 pm-11:49 pm

1 stop7h 14m

$243

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Sun 9/28

7:15 am-12:39 pm

1 stop8h 24m

Seattle/Tacoma Intl

Sat 10/4

11:40 pm-10:36 am

1 stop7h 56m

$243

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Wed 9/3

7:15 am-2:43 pm

1 stop10h 28m

Seattle/Tacoma Intl

Wed 9/10

11:55 pm-10:36 am

1 stop7h 41m

$243

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Sun 11/9

7:15 am-2:45 pm

1 stop10h 30m

Seattle/Tacoma Intl

Mon 11/17

11:05 pm-9:57 am

1 stop7h 52m

$243

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Fri 10/24

7:15 am-2:45 pm

1 stop10h 30m

Seattle/Tacoma Intl

Wed 11/5

1:40 pm-12:41 am

1 stop8h 01m

$243

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Fri 9/12

7:06 pm-11:43 pm

1 stop7h 37m

Seattle/Tacoma Intl

Tue 9/16

6:00 am-6:07 pm

1 stop9h 07m

$243

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Sun 11/9

7:15 am-2:45 pm

1 stop10h 30m

Seattle/Tacoma Intl

Wed 11/12

11:55 pm-10:51 am

1 stop7h 56m

$243

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/14

Showing 1-10 of 60 results
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The best insider tips for Washington, D.C. to Seattle flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. to Seattle trip
Airports
DCA

DCA has two parking garages and an economy lot. Reserve online as lots fill quickly, especially during busy times.

Read more about DCAby Emily Zemler
IAD

The Aerotrain connects IAD terminals, but walking can be lengthy. Pay attention to signage for the right train direction.

Read more about IADby Ramsey Qubein
SEA

Use the Link light rail from SEA to downtown Seattle. It's affordable, runs every 10 minutes, and takes under 40 minutes.

Read more about SEAby Brandon Schultz
Our travel experts
Emily Zemler

Emily Zemler

Expert on DCA

Emily Zemler

Emily Zemler

Emily is a freelance writer and book author based in London covering entertainment and travel. Her work has appeared in Los Angeles Times, Observer, and Conde Nast Traveler She has ventured to more than 40 countries and all seven continents, always in search of a great art museum. She has written extensively about hotels, luxury travel, and aviation.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on IAD

Ramsey Qubein

Ramsey Qubein

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more
Brandon Schultz

Brandon Schultz

Expert on SEA

Brandon Schultz

Brandon Schultz

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.

Read more

Best time to book a flight from Washington, D.C. to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Washington, D.C. with our price prediction graph.
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 Washington, D.C. to Seattle

How far ahead should I book a flight from Washington, D.C. to Seattle?

Use this chart to determine the optimal time to book a round-trip flight from Washington, D.C. to Seattle. Price data was last updated on August 8, 2025.

The best time to book flights from Washington, D.C. to Seattle is 85 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Washington, D.C. to Seattle?

Currently, January is the cheapest month in which you can book a flight from Washington, D.C. to Seattle (average of $238). Flying from Washington, D.C. to Seattle in June is currently the most expensive (average of $389). 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.

What is the cheapest time of day to fly from WAS to SEA?

Find hourly flight availability from Washington, D.C. to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 14, 2025.

It’s typically best to fly out from Washington, D.C. to Seattle in the evening. Doing so could potentially save you 20% on the flight price compared to flying in the morning, which is usually more expensive.

What is the cheapest day to fly from Washington, D.C. to Seattle?

Use this chart to determine the cheapest time to fly round-trip from Washington, D.C. to Seattle. Price data was last updated on August 10, 2025.

Travelers seeking maximum savings on their Washington, D.C. to Seattle flight should consider departing on Thursday evenings when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Washington, D.C. to Seattle

Explore weekly flight availability from Washington, D.C. to Seattle. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated August 14, 2025.

The most flights from WAS to SEA are scheduled on a Wednesday (41 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (20 on average).

How much does it cost to fly round-trip from Washington, D.C. to Seattle?

What’s the top layover airport for flights from Washington, D.C. to Seattle?

Share of 1-stop round-trip flights from Washington, D.C. to Seattle chosen by Cheapflights users in the past 12 months, using the same layover each way.

Denver (DEN) – chosen by Cheapflights users on 43% of 1-stop itineraries from Washington, D.C. to Seattle on Cheapflights.

What’s the cheapest layover airport for flights from Washington, D.C. to Seattle?

Average round-trip fare for 1-stop flights from Washington, D.C. to Seattle, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Las Vegas (LAS) is the most affordable 1-stop option, with an average round-trip price of $215.

What’s the fastest layover option from Washington, D.C. to Seattle?

Shortest average travel time for 1-stop one-way flights from Washington, D.C. to Seattle, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Chicago (MDW) have the shortest average one-way travel time for 1-stop routes: 9h 16m.

Which airport typically offers the quickest layover for flights from Washington, D.C. to Seattle?

Average layover duration for 1-stop one-way flights from Washington, D.C. to Seattle, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Denver (DEN) offer the fastest connection on this route, with an average layover time of 2h 04m.

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 August 14, 2025.
Read reviews from past customers who have flown Alaska Airlines, Delta, and Hawaiian Airlines from Washington, D.C. to Seattle. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Delta
8.0
Very good
7,980 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Hawaiian Airlines
7.8
Good
2,656 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
United Airlines
7.4
Good
8,916 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Frontier
5.8
Fair
3,217 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.

Related info for your journey

Find useful and relevant information for your journey from Washington, D.C. to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Seattle from Washington, D.C.?

    Seattle/Tacoma Intl (SEA), located 11.4 mi from the city center, is the airport you fly into when you book flights from Washington, D.C. to Seattle. 9 airlines have flights to Seattle/Tacoma Intl from Washington, D.C. on a regular basis. Booking flights from Washington, D.C. to Seattle/Tacoma Intl should not be difficult; the airport handles an average of 31 inbound flights from Washington, D.C. per day.

  • What are the cheapest airlines flying from Washington, D.C. to Seattle round-trip?

    According to our current data, Frontier ($111), Hawaiian Airlines ($168), and Delta ($191) offers the cheapest pricing from Washington, D.C. to Seattle. You may be able to fly from Washington, D.C. to Seattle for 72% less than the average price by searching for these airlines.

  • What are the cheapest airlines to fly from Washington, D.C. to Seattle one-way?

    For one-way options, check prices for Southwest. According to our data, you can fly for as low as $139. Users have also found prices from $139 and $142 on Frontier and Hawaiian Airlines, respectively.

  • What are the most popular routes from Washington, D.C. to Seattle?

    The most popular flight routes from Washington, D.C. to Seattle are Washington, D.C. Reagan-National - Seattle/Tacoma Intl, Washington, D.C. Dulles Intl - Seattle/Tacoma Intl and Baltimore/Washington - Seattle/Tacoma Intl.

  • What are the most reliable airlines from Washington, D.C. to Seattle?

    Consider Japan Airlines (93%), China Eastern (84%) or Delta (84%) when booking your flight. These represent the most reliable airlines when flying from Washington, D.C. to Seattle.

  • What are the cheapest flights from Washington, D.C. to Seattle?

    Looking for the cheapest flight from Washington, D.C. to Seattle? While on average our users pay $918, our data indicates the cheapest price to be $154. The most popular route (Washington, D.C. Reagan-National - Seattle/Tacoma Intl), is priced around $172.

  • Can I find deals for flights from Washington, D.C. to Seattle that include hotel bookings?

    Yes. In addition to deals on Washington, D.C. to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington, D.C. to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington, D.C. to Seattle.

  • Can I find deals for business class flights from Washington, D.C. to Seattle?

    Yes. Cheapflights offers flight deals from Washington, D.C. to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Washington, D.C. to Seattle?

    Currently, January is the cheapest month in which you can book a flight from Washington, D.C. to Seattle (average of $238). Flying from Washington, D.C. to Seattle in June is currently the most expensive (average of $389). 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.

See more FAQs

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
SeaTac
Tukwila
Tacoma
Ocean Shores
Lakewood
Lynnwood
Lacey
Leavenworth
Renton
Olympia
Puyallup
Kent
Cle Elum
Chehalis
Kirkland
Issaquah
Aberdeen
Shoreline
Federal Way
Shelton

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.

Top 9 airlines flying from Washington, D.C. to Seattle

Discover the top 9 airlines that operate flights from Washington, D.C. 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 2,558,603 searches. Data last updated August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$111Average$257FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$123Average$265FlexibilityNo cancel feeOn-time65%
Hawaiian AirlinesCheapest$168Average$445FlexibilityNo cancel feeOn-time85%
DeltaCheapest$191Average$376FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$206Average$457FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$261Average$478FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$265Average$485FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$276Average$427FlexibilityNo cancel feeOn-time69%
Sun Country AirCheapest$313Average$402FlexibilityNo cancel feeOn-time83%

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