Here are the options for roundtrip airfare from Alexandria, Virginia, to Burlington, Vermont, for your specified dates:

1. Expedia: Roundtrip flights start at $551. More details can be found here.

2. Travelocity: The cheapest roundtrip flights found in the past week were priced at $642. Check their site for more information here.

3. Flights.com: Offers various deals and price comparisons for flights. You can explore further on their website here.

4. KAYAK: Lists different airlines and their roundtrip fares, often providing competitive pricing. View their offerings here.

5. American Airlines: They have roundtrip flights from $309 depending on the route and availability. Details can be found here.

6. Delta Airlines: Offers roundtrip flights from around $476. More deals can be seen here.

The cheapest roundtrip option you currently have is from American Airlines for $309. Prices are subject to change and may vary based on availability, so it's advisable to book as soon as possible if you find a good deal.

Sources

Cheap Flights from Alexandria to Burlington (AEX-BTV)Cheap American Airlines flights from Alexandria to Burlington ...AEX to BTV: Alexandria to Burlington Flights$131 Cheap Flights from Washington (DCA) to Burlington (BTV)Cheap Flights from Alexandria to Burlington | (AEX - BTV) - KAYAKAmerican Airlines® - Find flights to BurlingtonAmazing Delta AEX to BTV Flight Deals - Travelocity

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