A "red-eye" flight is a flight that goes overnight (ie. 1am to 6am) on a commercial airline.
It's named because of the sleep you lose (and so, your eyes are tired and red).
You can also use "overnight flight" for the same situation.
If the flight is early in the morning, for example between 4am and 6am you could call it an "early morning flight".
The early hours = the early hours of the morning such as 1am.
A red-eye flight is any flight departing late at night and arriving early the next morning.
The term red-eye, derives from the fatigue symptom of having red eyes, which can be caused or aggravated by late-night travel.
The red-eye flight usually flies eastbound.
The flight is usually four to six hours, less than seven-hour full sleep, but due to time differences and prevailing jet stream winds from the west, a red-eye flight that departs around midnight arrives around 6am or 7am.
Westbound flights that depart around midnight and arrive in the early morning are also colloquially called red-eye flights, despite the fact that those flights are significantly longer than seven or eight hours.
The early hours = 未明
深夜一時といった早朝。
真夜中に出発し、その次の早朝に着くような便のことをA red-eye flightと言います。 このred eyeという言葉は、深夜の移動による疲れ目の影響で目が赤くなってしまう症状から派生しました。red eye flightは、4時間から6時間ほどのフライトで、7時間まではいきません。時差と西からのジェットストリームを超えるおかげで、深夜に出発した便は早朝6時7時に到着するようになる。7時間8時間より長いフライトになるが、深夜にでて早朝に着く西行の便のこと口語的にred eye flightといいます。
I will be flying to Japan first thing in the morning.
"I am on the late flight home/to Japan." This explains that the flight is very late at night.
"I am on the last flight out tonight." This explains that you are leaving on the very last flight that day.
"I will be flying to Japan first thing in the morning." or "I am on the first flight out." This explains to the person that you are leaving on the first flight very early in the morning.
I am on the late flight home/to Japan.
これは、フライトがとても遅いことを言います。
I am on the last flight out tonight.
これは、その日の最終便で飛び立つということを言います。
I will be flying to Japan first thing in the morning.
I am on the first flight out.
これは、朝早い始発の便で飛び立つ人について説明します。
First thing in the morning...On the earliest flight...(The Red Eye)
I will catch the last "night-flight" back to Japan.
The red eye is an old Idiom to describe a very early morning flight, often used by sales people... in order to make it to 9 am appointments in another city..
First thing in the morning is of course a very descriptive phrase...
or last thing at night ....for the night owls among us (idiom).
例：First thing in the morning...On the earliest flight...(The Red Eye)
「朝一番にすること。。一番早い便に乗る。。（赤い目で）」
例：I will catch the last "night-flight" back to Japan.
「日本行きの最終の夜行便のチケットを取ります。」
"The red eye"は「朝はやく」を表す古い言い方です。
特に営業職の人が言うようです。他の街である朝9時のアポを想像してください。
"First thing in the morning" はとても叙述的な表現です。
"For the night owls among us（フクロウが僕らのところへ来る頃）"は反対で、夜寝る前という意味です。
I have an early flight back to Japan in the morning.
i have a late flight back to Japan at night.
Whether you are going back somewhere early in the morning or at night, you can use one of these phrases or sentences to help you out.
For example.
Want to have one more drink?
I better not.
Why not?
I have an early flight back to Japan in the morning.
I hope that helps.
Have a great day.
Will
早朝や夜のどこかに戻る場合でも、これらのフレーズや文章のいずれかを使用して手伝うことができます。
例えば。
もう一杯飲みたいですか？
しないほうがいい。
何故なの？
朝早く日本に帰る便があります。
それがお役に立てば幸いです。
すてきな一日を。
意志
こんにちは。
様々な言い方ができると思いますが、例えば下記のような表現はいかがでしょうか：
・I'm going back to Japan on an early flight.
早朝便で日本に帰ります。
early flight は「早朝便」というニュアンスを持つ英語表現です。
late flight と言えば「深夜便」のような意味になります。
ぜひ参考にしてください。
*I'm taking the early morning flight to Japan./I will fly late at night to Japan. - Flight/ fly means travelling by air. Opposite of early is late.
A: What are your travel arrangements?
B: I will fly out early morning.
例文
*I'm taking the early morning flight to Japan.
早朝のフライトで日本に帰ります
I will fly late at night to Japan.
夜遅くのフライトで日本に帰ります
- Flight/ fly は飛行機で移動することです。earlyの反対はlateです。
例文
A: What are your travel arrangements?
旅行の手配はどうなっているの？
B: I will fly out early morning.
早朝のフライトで出発します
日本 
カナダ 
イギリス 
南アフリカ 
アメリカ合衆国 
