Our data shows that July tends to be the cheapest month to fly to Washington Dulles Intl Airport from Illinois. Users have commonly found prices around $220 for the month, but tickets can be as low as $74. Due to multiple factors, prepare for potentially higher prices in November.
Users have found that booking a flight from Illinois to Washington Dulles Intl Airport at least 14 days early can save you up to 9% on average compared to booking a flight this week. If booking 14 days before your flight isn’t an option for you, users have found flights from Illinois to Washington Dulles Intl Airport for as little as $196 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $227 for flights departing within the next 3 days.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Washington Dulles Intl Airport as you normally would.
||$43||$323||No cancel fee||71%|
||$97||$188||No cancel fee||65%|
||$105||$366||No cancel fee||N/A|
||$224||$354||No cancel fee||69%|