HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news

Cheap flights from Milwaukee to Burlington (MKE - BTV) from $196

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 10/16. 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.
MKE — BTV
Apr 30 — May 71
From?
To?
Tue 4/30
Tue 5/7
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

The best prices from Milwaukee-Mitchell to Burlington are usually found in September or January, booked 70 days in advance, depart on a Saturday or Tuesday and return on a Saturday

Cheap flight deals from Milwaukee to Burlington

Discover tips and strategies to find the most affordable flight options for your journey from Milwaukee (MKE) to Burlington (BTV). 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 April 25, 2024.

Popular in

November

Cheapest in

September

Round-trip from

$310

One-way from

$276
High demand for flights, 40% potential price rise
Search Deals
Best time to find cheap flights, 34% potential price drop
Search Deals
From Milwaukee-Mitchell to Burlington
Search Deals
One-way flight from Milwaukee-Mitchell to Burlington
Search Deals

What is the cheapest day to fly round-trip from Milwaukee to Burlington, Vermont?

Flying to your destination on a Sunday can be more expensive, but this shouldn’t discourage you from finding affordable options to get to Burlington, Vermont. Check prices with Cheapflights to find a great deal for your trip.

How far in advance should I book a flight from Milwaukee to Burlington, Vermont?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 58 days in advance, which can save you up to 70% on flights from Milwaukee to Burlington, Vermont compared to booking the week you need them. Waiting 58 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $316. For sooner than that we have options available in the next 3 days from $316.

What is the cheapest month to fly from Milwaukee to Burlington, Vermont?

September can be a great time to fly to Burlington, Vermont from Milwaukee with a flight ticket averaging about $439. Cheapflights users have found deals in the month of September for as cheap as $185. The most expensive prices can be found in the month of November.

When is the cheapest time to fly from Milwaukee to Burlington, Vermont (MKE - BTV)?

Unlike at noon, when flights are generally more expensive, you can save up to 16% on flights from Milwaukee to Burlington, Vermont by exploring options for tickets in the morning.

Cheap Delta flights from Milwaukee to Burlington

Explore cheap flight options specifically provided by Delta for the route between Milwaukee and Burlington. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 3,068,701 searches. Data last updated April 25, 2024.
Peruse some of the lowest-priced Delta flights we've found from Milwaukee to Burlington. Make sure to check back often as deals are often changing.
Wed 10/169:59 amMKE - BTV
1 stop5h 12mDelta
Sat 10/196:00 amBTV - MKE
1 stop8h 43mDelta
Deal found 4/24$196
Wed 10/166:00 amMKE - BTV
2 stops9h 11mDelta
Sat 10/196:00 amBTV - MKE
1 stop8h 43mDelta
Deal found 4/24$227
Sat 5/45:00 pmMKE - BTV
1 stop5h 36mDelta
Tue 5/76:00 amBTV - MKE
1 stop5h 00mDelta
Deal found 4/24$252
Sat 5/45:00 pmMKE - BTV
1 stop5h 36mDelta
Tue 5/76:00 amBTV - MKE
2 stops9h 36mDelta
Deal found 4/24$257
Sat 5/412:58 pmMKE - BTV
2 stops9h 38mDelta
Tue 5/711:21 amBTV - MKE
2 stops10h 30mDelta
Deal found 4/24$262
Wed 10/166:00 amMKE - BTV
2 stops9h 11mDelta
Sat 10/196:00 amBTV - MKE
2 stops11h 07mDelta
Deal found 4/24$323
Mon 9/164:15 pmMKE - BTV
1 stop6h 12mDelta
Sun 9/226:00 amBTV - MKE
1 stop8h 43mDelta
Deal found 4/24$371
Mon 9/94:15 pmMKE - BTV
1 stop6h 12mDelta
Fri 9/136:15 amBTV - MKE
2 stops9h 48mDelta
Deal found 4/23$417
Mon 9/1612:20 pmMKE - BTV
2 stops9h 34mDelta
Sun 9/226:00 amBTV - MKE
1 stop8h 43mDelta
Deal found 4/24$467

Cheap American Airlines flights from Milwaukee to Burlington

Explore cheap flight options specifically provided by American Airlines for the route between Milwaukee and Burlington. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 3,068,701 searches. Data last updated April 25, 2024.
Browse through some of the cheapest American Airlines flights traveling from Milwaukee to Burlington. Deals are refreshing constantly so come back soon for more options.
Mon 9/910:16 amMKE - BTV
1 stop6h 18mAmerican Airlines
Fri 9/1311:35 amBTV - MKE
1 stop6h 48mAmerican Airlines
Deal found 4/23$256
Fri 5/245:05 pmMKE - BTV
1 stop4h 34mAmerican Airlines
Fri 5/311:07 pmBTV - MKE
1 stop5h 49mAmerican Airlines
Deal found 4/24$452

Cheap Milwaukee to Burlington flights in April & May 2024

Find cheap flight options from Milwaukee to Burlington specifically for the months of April and May 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 3,068,701 searches. Prices were last updated on April 25, 2024.
These are some of the best deals we've found on flights to Burlington in 2024 at this time. Check back soon for alternative fares.
Fri 4/263:10 pmMKE - BTV
1 stop7h 10mAmerican Airlines
Tue 4/302:08 pmBTV - MKE
1 stop6h 23mAmerican Airlines
Deal found 4/25$239
Sat 5/45:00 pmMKE - BTV
1 stop5h 36mDelta
Tue 5/76:00 amBTV - MKE
1 stop5h 00mDelta
Deal found 4/24$252
Sat 5/45:00 pmMKE - BTV
1 stop5h 36mDelta
Tue 5/76:00 amBTV - MKE
2 stops9h 36mDelta
Deal found 4/24$257
Sat 5/412:58 pmMKE - BTV
2 stops9h 38mDelta
Tue 5/711:21 amBTV - MKE
2 stops10h 30mDelta
Deal found 4/24$262
Fri 4/2611:00 amMKE - BTV
2 stops11h 23mDelta
Tue 4/306:04 amBTV - MKE
1 stop4h 57mDelta
Deal found 4/25$272
Fri 4/2611:00 amMKE - BTV
2 stops11h 23mDelta
Tue 4/304:24 pmBTV - MKE
2 stops8h 31mDelta
Deal found 4/25$277
Thu 5/236:30 amMKE - BTV
1 stop6h 47mUnited Airlines
Thu 5/306:15 amBTV - MKE
1 stop5h 45mUnited Airlines
Deal found 4/23$402
Fri 5/245:05 pmMKE - BTV
1 stop4h 34mAmerican Airlines
Fri 5/311:07 pmBTV - MKE
1 stop5h 49mAmerican Airlines
Deal found 4/24$452
Thu 5/233:59 pmMKE - BTV
1 stop6h 05mDelta
Thu 5/305:00 amBTV - MKE
2 stops8h 10mDelta
Deal found 4/23$507

Milwaukee to Burlington 2024 flight deals

Discover exclusive flight deals for travel between Milwaukee and Burlington in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 3,068,701 searches. Data last updated April 25, 2024.
These are some of the best deals we've found on flights to Burlington in 2024 at this time. Check back soon for alternative fares.
Wed 10/169:59 amMKE - BTV
1 stop5h 12mDelta
Sat 10/196:00 amBTV - MKE
1 stop8h 43mDelta
Deal found 4/24$196
Wed 10/166:00 amMKE - BTV
2 stops9h 11mDelta
Sat 10/196:00 amBTV - MKE
1 stop8h 43mDelta
Deal found 4/24$227
Fri 4/263:10 pmMKE - BTV
1 stop7h 10mAmerican Airlines
Tue 4/302:08 pmBTV - MKE
1 stop6h 23mAmerican Airlines
Deal found 4/25$239
Sat 5/45:00 pmMKE - BTV
1 stop5h 36mDelta
Tue 5/76:00 amBTV - MKE
1 stop5h 00mDelta
Deal found 4/24$252
Mon 9/910:16 amMKE - BTV
1 stop6h 18mAmerican Airlines
Fri 9/1311:35 amBTV - MKE
1 stop6h 48mAmerican Airlines
Deal found 4/23$256
Sat 5/45:00 pmMKE - BTV
1 stop5h 36mDelta
Tue 5/76:00 amBTV - MKE
2 stops9h 36mDelta
Deal found 4/24$257
Sat 5/412:58 pmMKE - BTV
2 stops9h 38mDelta
Tue 5/711:21 amBTV - MKE
2 stops10h 30mDelta
Deal found 4/24$262
Fri 4/2611:00 amMKE - BTV
2 stops11h 23mDelta
Tue 4/306:04 amBTV - MKE
1 stop4h 57mDelta
Deal found 4/25$272
Fri 4/2611:00 amMKE - BTV
2 stops11h 23mDelta
Tue 4/304:24 pmBTV - MKE
2 stops8h 31mDelta
Deal found 4/25$277

Milwaukee to Burlington flights leaving soon

Find last-minute flight options from Milwaukee to Burlington for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 3,068,701 searches. Data last updated April 25, 2024.
Have a look at some of the last-minute flights available departing from Milwaukee to Burlington. It's wise to confirm all flight details are correct before booking.
Sat 5/45:00 pmMKE - BTV
1 stop5h 36mDelta
Tue 5/76:00 amBTV - MKE
1 stop5h 00mDelta
Deal found 4/24$252
Sat 5/45:00 pmMKE - BTV
1 stop5h 36mDelta
Tue 5/76:00 amBTV - MKE
2 stops9h 36mDelta
Deal found 4/24$257
Sat 5/412:58 pmMKE - BTV
2 stops9h 38mDelta
Tue 5/711:21 amBTV - MKE
2 stops10h 30mDelta
Deal found 4/24$262

One-way flights to Burlington from Milwaukee

Search for one-way flight options from Milwaukee to Burlington. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 3,068,701 searches. Data last updated April 25, 2024.
If you're seeking multiple options on one-way flights from Milwaukee to Burlington, be sure to check out these deals, which are updated often. Users needing a return flight from Milwaukee to Burlington should utilize the search form above.
Thu 5/236:30 amMKE - BTV
1 stop6h 47mUnited Airlines
Deal found 4/23$276
Thu 5/236:30 amMKE - BTV
2 stops16h 29mUnited Airlines
Deal found 4/23$370

Find flights from Milwaukee to Burlington within your budget

Customize your flight search to find flights from Milwaukee to Burlington 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 3,068,701 searches. Data last updated April 25, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$196 - $598

Route

Depart

Return

Price

Milwaukee-MitchellBurlington

MKE - BTV

MKEBTV

Milwaukee-Mitchell

Wed 10/16

1 stop5h 12m

Burlington

Sat 10/19

1 stop8h 43m

$196

Milwaukee-MitchellBurlington

MKE - BTV

MKEBTV

Milwaukee-Mitchell

Wed 10/16

2 stops9h 11m

Burlington

Sat 10/19

1 stop8h 43m

$227

Milwaukee-MitchellBurlington

MKE - BTV

MKEBTV

Milwaukee-Mitchell

Mon 9/9

1 stop6h 18m

Burlington

Fri 9/13

1 stop6h 48m

$256

Milwaukee-MitchellBurlington

MKE - BTV

MKEBTV

Milwaukee-Mitchell

Wed 10/16

2 stops9h 11m

Burlington

Sat 10/19

2 stops11h 07m

$323

Milwaukee-MitchellBurlington

MKE - BTV

MKEBTV

Milwaukee-Mitchell

Mon 9/16

1 stop6h 12m

Burlington

Sun 9/22

1 stop8h 43m

$371

Milwaukee-MitchellBurlington

MKE - BTV

MKEBTV

Milwaukee-Mitchell

Thu 5/23

1 stop6h 47m

Burlington

Thu 5/30

1 stop5h 45m

$402

Milwaukee-MitchellBurlington

MKE - BTV

MKEBTV

Milwaukee-Mitchell

Mon 9/9

1 stop6h 12m

Burlington

Fri 9/13

2 stops9h 48m

$417

Milwaukee-MitchellBurlington

MKE - BTV

MKEBTV

Milwaukee-Mitchell

Fri 5/24

1 stop4h 34m

Burlington

Fri 5/31

1 stop5h 49m

$452

Milwaukee-MitchellBurlington

MKE - BTV

MKEBTV

Milwaukee-Mitchell

Fri 5/24

2 stops15h 38m

Burlington

Fri 5/31

1 stop6h 41m

$598

Flights are sorted by cheapest first

Deals found on 4/24

When is the best time to book a flight from Milwaukee to Burlington, Vermont?

Use this chart to determine the optimal time to book a round-trip flight from Milwaukee to Burlington. Price data was last updated on January 28, 2024.
To ensure you get the cheapest price possible for a flight from Milwaukee to Burlington, Vermont, you should look to book at least 57 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.
Search Deals

When is the cheapest time to fly from Milwaukee to Burlington, Vermont?

Use this chart to determine the cheapest time to fly round-trip from Milwaukee to Burlington. Price data was last updated on April 21, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Milwaukee to Burlington, Vermont flight should consider departing on Wednesday mornings when fares are most often at their lowest. Monday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

Average price of flights to Burlington by month

Plan your trip from Milwaukee to Burlington by taking into account the cheapest months to travel. The average price of a one-way flight from Milwaukee to Burlington is currently $323 while a round-trip flight costs $360. Price data was last updated on April 21, 2024.

Currently, December is the cheapest month in which you can book a flight from Milwaukee to Burlington, Vermont (average of $310). Flying from Milwaukee to Burlington, Vermont in April is currently the most expensive (average of $477). 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.

January

$326

February

$355

March

$449

April

$477

May

$365

June

$452

July

$466

August

$405

September

$380

October

$342

November

$335

December

$310

Temperature and rainfall in Burlington by month

Plan your trip to Burlington by taking into account the average temperature and rainfall totals by month.

BTV

Temperature

17.6 - 69.8 °F

Reviews of airlines servicing Burlington

Get insights into the airlines that provide service to Burlington. 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 Burlington. Reviews last updated April 25, 2024.
Read through reviews of airlines operating flights from Milwaukee to Burlington, such as Delta, American Airlines and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.1
Very good
10,975 reviews
Check prices

Crew

8.6

Overall

8.1

Food

7.4

Comfort

7.9

Boarding

8.2

Entertainment

8.0

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

Delta
8.1
Very good
10,975 reviews
Delta
8.1
Very good
10,975 reviews
Check prices

Crew

8.6

Overall

8.1

Food

7.4

Comfort

7.9

Boarding

8.2

Entertainment

8.0

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

United Airlines
7.4
Good
11,255 reviews
Delta
8.1
Very good
10,975 reviews
Check prices

Crew

8.6

Overall

8.1

Food

7.4

Comfort

7.9

Boarding

8.2

Entertainment

8.0

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

American Airlines
7.3
Good
14,898 reviews
Delta
8.1
Very good
10,975 reviews
Check prices

Crew

8.6

Overall

8.1

Food

7.4

Comfort

7.9

Boarding

8.2

Entertainment

8.0

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

Related info for your journey

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

  • Can I find flights from Milwaukee to Burlington, Vermont for under $200 on Cheapflights?

    Yes, there are multiple flights from Milwaukee to Burlington, Vermont for under $200. The cheapest flight booked recently is on Delta for just $196, but on average you can expect to pay $476.

  • Are there last-minute flights available from Milwaukee to Burlington, Vermont for under $300?

    There are currently 3+ open flights from Milwaukee to Burlington, Vermont within the next 7 days for less than $300.

  • What are the cheapest airlines flying from Milwaukee to Burlington, Vermont round-trip?

    Flying on Delta is currently your cheapest option to Burlington, Vermont, with prices starting at $196. Additional round-trip tickets that might be worth considering are offered by American Airlines and United Airlines, with the lowest prices starting at $256 and $402, respectively. Delta is priced at 55% lower than the current average price of a flight leaving 3 months from now.

  • What are the most popular airlines that fly from Milwaukee to Burlington, Vermont?

    When booking a flight from Milwaukee to Burlington, Vermont, you may want to consider flying on American Airlines, JetBlue or Delta as they are the most popular for this route.

  • What does MKE to BTV mean?

    Milwaukee-Mitchell Airport is MKE and Burlington Airport is BTV. These codes are created by the International Air Transport Association (IATA) and airlines use them to identify the departing and arrival airports in the flight routes they service.

  • Can I find deals for flights from Milwaukee to Burlington that include extra baggage allowance?

    The amount of baggage you can bring on your Milwaukee to Burlington flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Milwaukee to Burlington with specific airlines?

    Yes, Cheapflights allows you to browse and filter Milwaukee to Burlington flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from Milwaukee to Burlington that include hotel bookings?

    Yes. In addition to deals on Milwaukee to Burlington flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Milwaukee to Burlington?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Milwaukee to Burlington.

  • Can I find deals for business class flights from Milwaukee to Burlington?

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

  • Can I find deals for flights from Milwaukee to Burlington that allow pets onboard?

    Many airlines flying from Milwaukee to Burlington offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Milwaukee to Burlington?

    Yes, you can often find last-minute deals on Milwaukee to Burlington flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Milwaukee to Burlington, Vermont flight deals updated?

    The Milwaukee to Burlington, Vermont flight deals you see on this page were last updated on 4/25.

See more FAQs

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 for Milwaukee to Burlington
See prices for flight routes from nearby airports that may be better suited for you.

Madison to Burlington flights
Appleton to Burlington flights
Green Bay to Burlington flights
La Crosse to Burlington flights
Wausau to Burlington flights

Top 4 airlines flying from Milwaukee to Burlington

Discover the top 4 airlines that operate flights from Milwaukee to Burlington. 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 3,068,701 searches. Data last updated April 25, 2024.
AirlineCheapestAverageFlexibilityOn-time
JetBlueCheapest$159Average$416FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
American AirlinesCheapest$185Average$418FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
DeltaCheapest$247Average$365FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
United AirlinesCheapest$289Average$445FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Sacramento to Seattle flights
New York to Chicago flights
New Orleans to New York flights
Charlotte to Boston flights
Los Angeles to Washington, D.C. flights
New York to Milan flights
Las Vegas to Los Angeles flights
Denver to Albuquerque flights
New York to Singapore flights
Philadelphia to Las Vegas flights
Miami to New Orleans flights
Milwaukee to Budapest flights

Search flights from Milwaukee to Burlington by cabin class

Find flights from Milwaukee to Burlington, based on your preferred cabin class, be it economy, premium economy, business, or first class.
First Class
Business Class
Prem Econ Class
Economy Class

Book a flight to one of these trending destinations

User searches for flights to these destinations increased 20% or more in the past 90 days compared to other destinations
Flights to Perugia Sant Egidio
Flights to Biarritz Parme
Flights to Argostoli Cephalonia
Flights to Melilla
Flights to Milas–Bodrum
Flights to Girona Costa Brava
Flights to Fez Sais
Flights to Zakynthos Dionsios Salomos
Flights to Bourgas
Flights to Bodø
Flights to Reggio Calabria Tito Menniti
Flights to Bastia Poretta
Flights to Skiathos
Flights to Kalamata
Flights to Batumi
Flights to Menorca/Mahon
Flights to Kristiansand Kjevik
Flights to Champaign University-Willard
Flights to Kagoshima
Flights to Ohrid
Flights to Clermont-Ferrand Aulnat
Flights to Parikia Paros
Flights to Lanzhou Arpt
Flights to Mason City

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Milwaukee to Burlington?

When you search for this flight from Milwaukee to Burlington, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Milwaukee to Burlington?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Milwaukee to Burlington.

Can Cheapflights find flights from Milwaukee to Burlington with no change fees?

Certainly. Search results for flights to Burlington from Milwaukee shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Milwaukee to Burlington become cheaper?

Of course! You can now track prices for flights from Milwaukee to Burlington and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
View all available airlines